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T80: Sync with latest version.

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sorgelig
2018-08-21 23:21:12 +08:00
parent 7aaa1db5e3
commit 75557d8fd3
15 changed files with 1002 additions and 1378 deletions
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7
TSConf-lite.qsf
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@ -355,12 +355,7 @@ set_global_assignment -name PRE_FLOW_SCRIPT_FILE "quartus_sh:sys/build_id.tcl"
set_global_assignment -name CDF_FILE jtag.cdf
set_global_assignment -name QIP_FILE sys/sys.qip
set_global_assignment -name VHDL_FILE src/t80/T80_Reg.vhd
set_global_assignment -name VHDL_FILE src/t80/T80_Pack.vhd
set_global_assignment -name VHDL_FILE src/t80/T80_MCode.vhd
set_global_assignment -name VHDL_FILE src/t80/T80_ALU.vhd
set_global_assignment -name VHDL_FILE src/t80/T80.vhd
set_global_assignment -name VHDL_FILE src/t80/T80s.vhd
set_global_assignment -name QIP_FILE src/t80/T80.qip
set_global_assignment -name VERILOG_FILE src/cpu/zsignals.v
set_global_assignment -name VERILOG_FILE src/cpu/zports.v
set_global_assignment -name VERILOG_FILE src/cpu/zmem.v

4
TSConf.sv
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@ -119,7 +119,7 @@ localparam CONF_STR = {
"O8,CPU Cache,On,Off;",
"O9A,#7FFD span,128K,128K Auto,1024K,512K;",
"OLN,ZX Palette,Default,B.black,Light,Pale,Dark,Grayscale,Custom;",
"OPR,INT Offset,2,3,4,5,6,7,0,1;",
"OPR,INT Offset,3,4,5,6,7,0,1,2;",
"-;",
"OBD,F11 Reset,boot.$C,sys.rom,ROM;",
"OEF, bank,TR-DOS,Basic 48,Basic 128,SYS;",
@ -144,7 +144,7 @@ assign CMOSCfg[18:16]= (status[18:16]) ? status[18:16] + 3'd2 : 3'd0;
assign CMOSCfg[20:19]= status[20:19] + 2'd2;
assign CMOSCfg[23:21]= status[23:21];
assign CMOSCfg[24] = 0;
assign CMOSCfg[27:25]= status[27:25] + 3'd2;
assign CMOSCfg[27:25]= status[27:25] + 3'd3;
//////////////////// CLOCKS ///////////////////

9
src/sound/gs.v
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@ -103,15 +103,12 @@ wire cpu_wr_n;
wire [15:0] cpu_a_bus;
wire [7:0] cpu_do_bus;
T80s cpu
T80pa cpu
(
.RESET_n(~RESET),
.CLK_n(CLK),
.CEN(CE & ~MEM_WAIT),
.WAIT_n(1),
.CLK(CLK),
.CEN_p(CE & ~MEM_WAIT),
.INT_n(int_n),
.NMI_n(1),
.BUSRQ_n(1),
.M1_n(cpu_m1_n),
.MREQ_n(cpu_mreq_n),
.IORQ_n(cpu_iorq_n),

7
src/t80/T80.qip Normal file
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@ -0,0 +1,7 @@
set_global_assignment -name VHDL_FILE src/t80/T80_Reg.vhd
set_global_assignment -name VHDL_FILE src/t80/T80_Pack.vhd
set_global_assignment -name VHDL_FILE src/t80/T80_MCode.vhd
set_global_assignment -name VHDL_FILE src/t80/T80_ALU.vhd
set_global_assignment -name VHDL_FILE src/t80/T80.vhd
set_global_assignment -name VHDL_FILE src/t80/T80pa.vhd
set_global_assignment -name VHDL_FILE src/t80/T80s.vhd

260
src/t80/T80.vhd
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@ -1,10 +1,28 @@
--------------------------------------------------------------------------------
-- ****
-- T80(c) core. Attempt to finish all undocumented features and provide
-- accurate timings.
-- Version 350.
-- Copyright (c) 2018 Sorgelig
-- Test passed: ZEXDOC, ZEXALL, Z80Full(*), Z80memptr
-- (*) Currently only SCF and CCF instructions aren't passed X/Y flags check as
-- correct implementation is still unclear.
--
-- ****
-- T80(b) core. In an effort to merge and maintain bug fixes ....
--
-- Ver 303 add undocumented DDCB and FDCB opcodes by TobiFlex 20.04.2010
-- Ver 301 parity flag is just parity for 8080, also overflow for Z80, by Sean Riddle
-- Ver 300 started tidyup.
--
-- MikeJ March 2005
-- Latest version from www.fpgaarcade.com (original www.opencores.org)
--
-- ****
-- Z80 compatible microprocessor core
--
-- Version : 0247
--
-- Copyright (c) 2001-2002 Daniel Wallner (jesus@opencores.org)
--
-- All rights reserved
--
-- Redistribution and use in source and synthezised forms, with or without
@ -45,37 +63,28 @@
-- File history :
--
-- 0208 : First complete release
--
-- 0210 : Fixed wait and halt
--
-- 0211 : Fixed Refresh addition and IM 1
--
-- 0214 : Fixed mostly flags, only the block instructions now fail the zex regression test
--
-- 0232 : Removed refresh address output for Mode > 1 and added DJNZ M1_n fix by Mike Johnson
--
-- 0235 : Added clock enable and IM 2 fix by Mike Johnson
--
-- 0237 : Changed 8080 I/O address output, added IntE output
--
-- 0238 : Fixed (IX/IY+d) timing and 16 bit ADC and SBC zero flag
--
-- 0240 : Added interrupt ack fix by Mike Johnson, changed (IX/IY+d) timing and changed flags in GB mode
--
-- 0242 : Added I/O wait, fixed refresh address, moved some registers to RAM
--
-- 0247 : Fixed bus req/ack cycle
--
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.numeric_std.all;
use IEEE.STD_LOGIC_UNSIGNED.all;
use work.T80_Pack.all;
entity T80 is
generic(
Mode : integer := 0; -- 0 => Z80, 1 => Fast Z80, 2 => 8080, 3 => GB
IOWait : integer := 0; -- 1 => Single cycle I/O, 1 => Std I/O cycle
IOWait : integer := 0; -- 0 => Single cycle I/O, 1 => Std I/O cycle
Flag_C : integer := 0;
Flag_N : integer := 1;
Flag_P : integer := 2;
@ -109,13 +118,7 @@ entity T80 is
IntCycle_n : out std_logic;
IntE : out std_logic;
Stop : out std_logic;
SavePC : out std_logic_vector(15 downto 0);
SaveINT : out std_logic_vector(7 downto 0);
RestorePC : in std_logic_vector(15 downto 0);
RestoreINT : in std_logic_vector(7 downto 0);
RestorePC_n : in std_logic
REG : out std_logic_vector(207 downto 0) -- IY, HL', DE', BC', IX, HL, DE, BC, PC, SP, R, I, F', A', F, A
);
end T80;
@ -135,6 +138,7 @@ architecture rtl of T80 is
signal I : std_logic_vector(7 downto 0);
signal R : unsigned(7 downto 0);
signal SP, PC : unsigned(15 downto 0);
signal RegDIH : std_logic_vector(7 downto 0);
signal RegDIL : std_logic_vector(7 downto 0);
signal RegBusA : std_logic_vector(15 downto 0);
@ -150,7 +154,7 @@ architecture rtl of T80 is
signal Alternate : std_logic;
-- Help Registers
signal TmpAddr : std_logic_vector(15 downto 0); -- Temporary address register
signal WZ : std_logic_vector(15 downto 0); -- MEMPTR register
signal IR : std_logic_vector(7 downto 0); -- Instruction register
signal ISet : std_logic_vector(1 downto 0); -- Instruction set selector
signal RegBusA_r : std_logic_vector(15 downto 0);
@ -167,7 +171,6 @@ architecture rtl of T80 is
signal BusAck : std_logic;
signal ClkEn : std_logic;
signal NMI_s : std_logic;
signal INT_s : std_logic;
signal IStatus : std_logic_vector(1 downto 0);
signal DI_Reg : std_logic_vector(7 downto 0);
@ -240,15 +243,22 @@ architecture rtl of T80 is
signal I_BTR : std_logic;
signal I_RLD : std_logic;
signal I_RRD : std_logic;
signal I_RXDD : std_logic;
signal I_INRC : std_logic;
signal SetWZ : std_logic_vector(1 downto 0);
signal SetDI : std_logic;
signal SetEI : std_logic;
signal IMode : std_logic_vector(1 downto 0);
signal Halt : std_logic;
signal XYbit_undoc : std_logic;
signal DOR : std_logic_vector(127 downto 0);
begin
REG <= DOR & std_logic_vector(PC) & std_logic_vector(SP) & std_logic_vector(R) & I & Fp & Ap & F & ACC when Alternate = '0'
else DOR(127 downto 112) & DOR(47 downto 0) & DOR(63 downto 48) & DOR(111 downto 64) &
std_logic_vector(PC) & std_logic_vector(SP) & std_logic_vector(R) & I & Fp & Ap & F & ACC;
mcode : T80_MCode
generic map(
Mode => Mode,
@ -308,6 +318,7 @@ begin
I_RLD => I_RLD,
I_RRD => I_RRD,
I_INRC => I_INRC,
SetWZ => SetWZ,
SetDI => SetDI,
SetEI => SetEI,
IMode => IMode,
@ -330,6 +341,8 @@ begin
port map(
Arith16 => Arith16_r,
Z16 => Z16_r,
WZ => WZ,
XY_State=> XY_State,
ALU_Op => ALU_Op_r,
IR => IR(5 downto 0),
ISet => ISet,
@ -352,15 +365,14 @@ begin
DI_Reg when Save_ALU_r = '0' else
ALU_Q;
process (RESET_n, RestorePC_n, CLK_n)
process (RESET_n, CLK_n)
variable n : std_logic_vector(7 downto 0);
variable ioq : std_logic_vector(8 downto 0);
begin
if CLK_n'event and CLK_n = '1' then
if RESET_n = '0' then
PC <= (others => '0'); -- Program Counter
A <= (others => '0');
TmpAddr <= (others => '0');
WZ <= (others => '0');
IR <= "00000000";
ISet <= "00";
XY_State <= "00";
@ -386,13 +398,11 @@ begin
Save_ALU_r <= '0';
PreserveC_r <= '0';
XY_Ind <= '0';
I_RXDD <= '0';
elsif RestorePC_n = '0' then
PC <= unsigned( RestorePC );
A <= RestorePC;
IStatus <= RestoreInt(1 downto 0);
elsif rising_edge(CLK_n) then
elsif ClkEn = '1' then
if ClkEn = '1' then
ALU_Op_r <= "0000";
Save_ALU_r <= '0';
@ -469,23 +479,23 @@ begin
BTR_r <= (I_BT or I_BC or I_BTR) and not No_BTR;
if Jump = '1' then
A(15 downto 8) <= DI_Reg;
A(7 downto 0) <= TmpAddr(7 downto 0);
A(7 downto 0) <= WZ(7 downto 0);
PC(15 downto 8) <= unsigned(DI_Reg);
PC(7 downto 0) <= unsigned(TmpAddr(7 downto 0));
PC(7 downto 0) <= unsigned(WZ(7 downto 0));
elsif JumpXY = '1' then
A <= RegBusC;
PC <= unsigned(RegBusC);
elsif Call = '1' or RstP = '1' then
A <= TmpAddr;
PC <= unsigned(TmpAddr);
A <= WZ;
PC <= unsigned(WZ);
elsif MCycle = MCycles and NMICycle = '1' then
A <= "0000000001100110";
PC <= "0000000001100110";
elsif MCycle = "011" and IntCycle = '1' and IStatus = "10" then
A(15 downto 8) <= I;
A(7 downto 0) <= TmpAddr(7 downto 0);
A(7 downto 0) <= WZ(7 downto 0);
PC(15 downto 8) <= unsigned(I);
PC(7 downto 0) <= unsigned(TmpAddr(7 downto 0));
PC(7 downto 0) <= unsigned(WZ(7 downto 0));
else
case Set_Addr_To is
when aXY =>
@ -495,7 +505,7 @@ begin
if NextIs_XY_Fetch = '1' then
A <= std_logic_vector(PC);
else
A <= TmpAddr;
A <= WZ;
end if;
end if;
when aIOA =>
@ -509,6 +519,7 @@ begin
A(15 downto 8) <= ACC;
end if;
A(7 downto 0) <= DI_Reg;
WZ <= (ACC & DI_Reg) + "1";
when aSP =>
A <= std_logic_vector(SP);
when aBC =>
@ -518,21 +529,40 @@ begin
A(7 downto 0) <= RegBusC(7 downto 0);
else
A <= RegBusC;
if SetWZ = "01" then
WZ <= RegBusC + "1";
end if;
if SetWZ = "10" then
WZ(7 downto 0) <= RegBusC(7 downto 0) + "1";
WZ(15 downto 8) <= ACC;
end if;
end if;
when aDE =>
A <= RegBusC;
if SetWZ = "10" then
WZ(7 downto 0) <= RegBusC(7 downto 0) + "1";
WZ(15 downto 8) <= ACC;
end if;
when aZI =>
if Inc_WZ = '1' then
A <= std_logic_vector(unsigned(TmpAddr) + 1);
A <= std_logic_vector(unsigned(WZ) + 1);
else
A(15 downto 8) <= DI_Reg;
A(7 downto 0) <= TmpAddr(7 downto 0);
A(7 downto 0) <= WZ(7 downto 0);
if SetWZ = "10" then
WZ(7 downto 0) <= WZ(7 downto 0) + "1";
WZ(15 downto 8) <= ACC;
end if;
end if;
when others =>
A <= std_logic_vector(PC);
end case;
end if;
if SetWZ = "11" then
WZ <= std_logic_vector(ID16);
end if;
Save_ALU_r <= Save_ALU;
ALU_Op_r <= ALU_Op;
@ -562,12 +592,22 @@ begin
end if;
end if;
if (TState = 2 and I_BTR = '1' and IR(0) = '1') or (TState = 1 and I_BTR = '1' and IR(0) = '0') then
ioq := ('0' & DI_Reg) + ('0' & std_logic_vector(ID16(7 downto 0)));
F(Flag_N) <= DI_Reg(7);
F(Flag_C) <= ioq(8);
F(Flag_H) <= ioq(8);
ioq := (ioq and x"7") xor ('0'&BusA);
F(Flag_P) <= not (ioq(0) xor ioq(1) xor ioq(2) xor ioq(3) xor ioq(4) xor ioq(5) xor ioq(6) xor ioq(7));
end if;
if TState = 2 and Wait_n = '1' then
if ISet = "01" and MCycle = "111" then
IR <= DInst;
end if;
if JumpE = '1' then
PC <= unsigned(signed(PC) + signed(DI_Reg));
WZ <= std_logic_vector(signed(PC) + signed(DI_Reg));
elsif Inc_PC = '1' then
PC <= PC + 1;
end if;
@ -575,12 +615,18 @@ begin
PC <= PC - 2;
end if;
if RstP = '1' then
TmpAddr <= (others =>'0');
TmpAddr(5 downto 3) <= IR(5 downto 3);
WZ <= (others =>'0');
WZ(5 downto 3) <= IR(5 downto 3);
end if;
end if;
if TState = 3 and MCycle = "110" then
TmpAddr <= std_logic_vector(signed(RegBusC) + signed(DI_Reg));
WZ <= std_logic_vector(signed(RegBusC) + signed(DI_Reg));
end if;
if MCycle = "011" and TState = 4 and No_BTR = '0' then
if I_BT = '1' or I_BC = '1' then
WZ <= std_logic_vector(PC)-"1";
end if;
end if;
if (TState = 2 and Wait_n = '1') or (TState = 4 and MCycle = "001") then
@ -609,10 +655,10 @@ begin
if TState = 3 then
if LDZ = '1' then
TmpAddr(7 downto 0) <= DI_Reg;
WZ(7 downto 0) <= DI_Reg;
end if;
if LDW = '1' then
TmpAddr(15 downto 8) <= DI_Reg;
WZ(15 downto 8) <= DI_Reg;
end if;
if Special_LD(2) = '1' then
@ -628,6 +674,12 @@ begin
F(Flag_Z) <= '0';
end if;
F(Flag_Y) <= I(5);
F(Flag_H) <= '0';
F(Flag_X) <= I(3);
F(Flag_N) <= '0';
when "01" =>
ACC <= std_logic_vector(R);
F(Flag_P) <= IntE_FF2;
@ -639,6 +691,11 @@ begin
F(Flag_Z) <= '0';
end if;
F(Flag_Y) <= R(5);
F(Flag_H) <= '0';
F(Flag_X) <= R(3);
F(Flag_N) <= '0';
when "10" =>
I <= ACC;
when others =>
@ -665,6 +722,8 @@ begin
if T_Res = '1' and I_INRC = '1' then
F(Flag_H) <= '0';
F(Flag_N) <= '0';
F(Flag_X) <= DI_Reg(3);
F(Flag_Y) <= DI_Reg(5);
if DI_Reg(7 downto 0) = "00000000" then
F(Flag_Z) <= '1';
else
@ -676,7 +735,11 @@ begin
end if;
if TState = 1 and Auto_Wait_t1 = '0' then
-- Keep D0 from M3 for RLD/RRD (Sorgelig)
I_RXDD <= I_RLD or I_RRD;
if I_RXDD='0' then
DO <= BusB;
end if;
if I_RLD = '1' then
DO(3 downto 0) <= BusA(3 downto 0);
DO(7 downto 4) <= BusB(3 downto 0);
@ -702,6 +765,11 @@ begin
F(Flag_H) <= '0';
F(Flag_N) <= '0';
end if;
if TState = 1 and I_BC = '1' then
n := ALU_Q - ("0000000" & F_Out(Flag_H));
F(Flag_X) <= n(3);
F(Flag_Y) <= n(1);
end if;
if I_BC = '1' or I_BT = '1' then
F(Flag_P) <= IncDecZ;
end if;
@ -739,7 +807,7 @@ begin
---------------------------------------------------------------------------
process (CLK_n)
begin
if CLK_n'event and CLK_n = '1' then
if rising_edge(CLK_n) then
if ClkEn = '1' then
-- Bus A / Write
RegAddrA_r <= Alternate & Set_BusA_To(2 downto 1);
@ -781,10 +849,10 @@ begin
RegAddrA <=
-- 16 bit increment/decrement
XY_State(1) & "11" when (TState = 2 or
(TState = 3 and MCycle = "001" and IncDec_16(2) = '1')) and IncDec_16(1 downto 0) = "10" and XY_State /= "00" else
Alternate & IncDec_16(1 downto 0) when (TState = 2 or
(TState = 3 and MCycle = "001" and IncDec_16(2) = '1')) else
(TState = 3 and MCycle = "001" and IncDec_16(2) = '1')) and XY_State = "00" else
XY_State(1) & "11" when (TState = 2 or
(TState = 3 and MCycle = "001" and IncDec_16(2) = '1')) and IncDec_16(1 downto 0) = "10" else
-- EX HL,DL
Alternate & "10" when ExchangeDH = '1' and TState = 3 else
Alternate & "01" when ExchangeDH = '1' and TState = 4 else
@ -867,7 +935,8 @@ begin
DOBH => RegBusB(15 downto 8),
DOBL => RegBusB(7 downto 0),
DOCH => RegBusC(15 downto 8),
DOCL => RegBusC(7 downto 0));
DOCL => RegBusC(7 downto 0),
DOR => DOR);
---------------------------------------------------------------------------
--
@ -876,7 +945,7 @@ begin
---------------------------------------------------------------------------
process (CLK_n)
begin
if CLK_n'event and CLK_n = '1' then
if rising_edge(CLK_n) then
if ClkEn = '1' then
case Set_BusB_To is
when "0111" =>
@ -925,7 +994,7 @@ begin
when "1010" =>
BusA <= "00000000";
when others =>
BusB <= "--------";
BusA <= "--------";
end case;
if XYbit_undoc='1' then
BusA <= DI_Reg;
@ -942,11 +1011,10 @@ begin
---------------------------------------------------------------------------
process (RESET_n,CLK_n)
begin
if CLK_n'event and CLK_n = '1' then
if RESET_n = '0' then
RFSH_n <= '1';
elsif CEN = '1' then
elsif rising_edge(CLK_n) then
if CEN = '1' then
if MCycle = "001" and ((TState = 2 and Wait_n = '1') or TState = 3) then
RFSH_n <= '0';
else
@ -966,49 +1034,14 @@ begin
IORQ <= IORQ_i;
Stop <= I_DJNZ;
SavePC <= std_logic_vector( PC );
SaveINT <= "0000" & IntE_FF2 & IntE_FF1 & IStatus when MCycle = "001" and TState = "001" and Prefix = "00" and IntCycle = '0' and NMICycle = '0' else
"1111" & IntE_FF2 & IntE_FF1 & IStatus;
-------------------------------------------------------------------------
--
-- Syncronise inputs
--
-------------------------------------------------------------------------
process (RESET_n, CLK_n)
variable OldNMI_n : std_logic;
begin
if CLK_n'event and CLK_n = '1' then
if RESET_n = '0' then
BusReq_s <= '0';
INT_s <= '0';
NMI_s <= '0';
OldNMI_n := '0';
elsif CEN = '1' then
BusReq_s <= not BUSRQ_n;
INT_s <= not INT_n;
if NMICycle = '1' then
NMI_s <= '0';
elsif NMI_n = '0' and OldNMI_n = '1' then
NMI_s <= '1';
end if;
OldNMI_n := NMI_n;
end if;
end if;
end process;
-------------------------------------------------------------------------
--
-- Main state machine
--
-------------------------------------------------------------------------
process (RESET_n, RestorePC_n, CLK_n)
process (RESET_n, CLK_n)
variable OldNMI_n : std_logic;
begin
if CLK_n'event and CLK_n = '1' then
if RESET_n = '0' then
MCycle <= "001";
TState <= "000";
@ -1023,29 +1056,24 @@ begin
Auto_Wait_t1 <= '0';
Auto_Wait_t2 <= '0';
M1_n <= '1';
BusReq_s <= '0';
NMI_s <= '0';
elsif rising_edge(CLK_n) then
elsif RestorePC_n = '0' then
MCycle <= "001";
TState <= "001";
NMICycle <= '0';
IntCycle <= '0';
IntE_FF1 <= RestoreINT(2);
IntE_FF2 <= RestoreINT(3);
if NMI_n = '0' and OldNMI_n = '1' then
NMI_s <= '1';
end if;
OldNMI_n := NMI_n;
Pre_XY_F_M <= "000";
Halt_FF <= '0';
BusAck <= '0';
No_BTR <= '0';
Auto_Wait_t1 <= '0';
Auto_Wait_t2 <= '0';
elsif CEN = '1' then
if CEN = '1' then
BusReq_s <= not BUSRQ_n;
Auto_Wait_t2 <= Auto_Wait_t1;
if T_Res = '1' then
Auto_Wait_t1 <= '0';
Auto_Wait_t2 <= '0';
else
Auto_Wait_t1 <= Auto_Wait or IORQ_i;
end if;
Auto_Wait_t2 <= Auto_Wait_t1;
No_BTR <= (I_BT and (not IR(4) or not F(Flag_P))) or
(I_BC and (not IR(4) or F(Flag_Z) or not F(Flag_P))) or
(I_BTR and (not IR(4) or F(Flag_Z)));
@ -1082,32 +1110,28 @@ begin
BusAck <= '1';
else
TState <= "001";
if NextIs_XY_Fetch = '1' then
MCycle <= "110";
Pre_XY_F_M <= MCycle;
if IR = "00110110" and Mode = 0 then
Pre_XY_F_M <= "010";
end if;
elsif (MCycle = MCycles) or
No_BTR = '1' or
(MCycle = "010" and I_DJNZ = '1' and IncDecZ = '1') or
( MCycle = "111" and MCycles= "001" and Pre_XY_F_M = "001" ) then
elsif (MCycle = "111") or (MCycle = "110" and Mode = 1 and ISet /= "01") then
MCycle <= std_logic_vector(unsigned(Pre_XY_F_M) + 1);
elsif (MCycle = MCycles) or No_BTR = '1' or (MCycle = "010" and I_DJNZ = '1' and IncDecZ = '1') then
M1_n <= '0';
MCycle <= "001";
IntCycle <= '0';
NMICycle <= '0';
if NMI_s = '1' and Prefix = "00" then
NMI_s <= '0';
NMICycle <= '1';
IntE_FF1 <= '0';
elsif (IntE_FF1 = '1' and INT_s = '1') and Prefix = "00" and SetEI = '0' then
elsif IntE_FF1 = '1' and INT_n='0' and Prefix = "00" and SetEI = '0' then
IntCycle <= '1';
IntE_FF1 <= '0';
IntE_FF2 <= '0';
end if;
elsif (MCycle = "111") or
(MCycle = "110" and Mode = 1 and ISet /= "01") then
MCycle <= std_logic_vector(unsigned(Pre_XY_F_M) + 1);
else
MCycle <= std_logic_vector(unsigned(MCycle) + 1);
end if;

185
src/t80/T8080se.vhd
View File

@ -1,185 +0,0 @@
--
-- 8080 compatible microprocessor core, synchronous top level with clock enable
-- Different timing than the original 8080
-- Inputs needs to be synchronous and outputs may glitch
--
-- Version : 0242
--
-- Copyright (c) 2002 Daniel Wallner (jesus@opencores.org)
--
-- All rights reserved
--
-- Redistribution and use in source and synthezised forms, with or without
-- modification, are permitted provided that the following conditions are met:
--
-- Redistributions of source code must retain the above copyright notice,
-- this list of conditions and the following disclaimer.
--
-- Redistributions in synthesized form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in the
-- documentation and/or other materials provided with the distribution.
--
-- Neither the name of the author nor the names of other contributors may
-- be used to endorse or promote products derived from this software without
-- specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-- POSSIBILITY OF SUCH DAMAGE.
--
-- Please report bugs to the author, but before you do so, please
-- make sure that this is not a derivative work and that
-- you have the latest version of this file.
--
-- The latest version of this file can be found at:
-- http://www.opencores.org/cvsweb.shtml/t80/
--
-- Limitations :
-- STACK status output not supported
--
-- File history :
--
-- 0237 : First version
--
-- 0238 : Updated for T80 interface change
--
-- 0240 : Updated for T80 interface change
--
-- 0242 : Updated for T80 interface change
--
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.numeric_std.all;
use work.T80_Pack.all;
entity T8080se is
generic(
Mode : integer := 2; -- 0 => Z80, 1 => Fast Z80, 2 => 8080, 3 => GB
T2Write : integer := 0 -- 0 => WR_n active in T3, /=0 => WR_n active in T2
);
port(
RESET_n : in std_logic;
CLK : in std_logic;
CLKEN : in std_logic;
READY : in std_logic;
HOLD : in std_logic;
INT : in std_logic;
INTE : out std_logic;
DBIN : out std_logic;
SYNC : out std_logic;
VAIT : out std_logic;
HLDA : out std_logic;
WR_n : out std_logic;
A : out std_logic_vector(15 downto 0);
DI : in std_logic_vector(7 downto 0);
DO : out std_logic_vector(7 downto 0)
);
end T8080se;
architecture rtl of T8080se is
signal IntCycle_n : std_logic;
signal NoRead : std_logic;
signal Write : std_logic;
signal IORQ : std_logic;
signal INT_n : std_logic;
signal HALT_n : std_logic;
signal BUSRQ_n : std_logic;
signal BUSAK_n : std_logic;
signal DO_i : std_logic_vector(7 downto 0);
signal DI_Reg : std_logic_vector(7 downto 0);
signal MCycle : std_logic_vector(2 downto 0);
signal TState : std_logic_vector(2 downto 0);
signal One : std_logic;
begin
INT_n <= not INT;
BUSRQ_n <= HOLD;
HLDA <= not BUSAK_n;
SYNC <= '1' when TState = "001" else '0';
VAIT <= '1' when TState = "010" else '0';
One <= '1';
DO(0) <= not IntCycle_n when TState = "001" else DO_i(0); -- INTA
DO(1) <= Write when TState = "001" else DO_i(1); -- WO_n
DO(2) <= DO_i(2); -- STACK not supported !!!!!!!!!!
DO(3) <= not HALT_n when TState = "001" else DO_i(3); -- HLTA
DO(4) <= IORQ and Write when TState = "001" else DO_i(4); -- OUT
DO(5) <= DO_i(5) when TState /= "001" else '1' when MCycle = "001" else '0'; -- M1
DO(6) <= IORQ and not Write when TState = "001" else DO_i(6); -- INP
DO(7) <= not IORQ and not Write and IntCycle_n when TState = "001" else DO_i(7); -- MEMR
u0 : T80
generic map(
Mode => Mode,
IOWait => 0)
port map(
CEN => CLKEN,
M1_n => open,
IORQ => IORQ,
NoRead => NoRead,
Write => Write,
RFSH_n => open,
HALT_n => HALT_n,
WAIT_n => READY,
INT_n => INT_n,
NMI_n => One,
RESET_n => RESET_n,
BUSRQ_n => One,
BUSAK_n => BUSAK_n,
CLK_n => CLK,
A => A,
DInst => DI,
DI => DI_Reg,
DO => DO_i,
MC => MCycle,
TS => TState,
IntCycle_n => IntCycle_n,
IntE => INTE);
process (RESET_n, CLK)
begin
if RESET_n = '0' then
DBIN <= '0';
WR_n <= '1';
DI_Reg <= "00000000";
elsif CLK'event and CLK = '1' then
if CLKEN = '1' then
DBIN <= '0';
WR_n <= '1';
if MCycle = "001" then
if TState = "001" or (TState = "010" and READY = '0') then
DBIN <= IntCycle_n;
end if;
else
if (TState = "001" or (TState = "010" and READY = '0')) and NoRead = '0' and Write = '0' then
DBIN <= '1';
end if;
if T2Write = 0 then
if TState = "010" and Write = '1' then
WR_n <= '0';
end if;
else
if (TState = "001" or (TState = "010" and READY = '0')) and Write = '1' then
WR_n <= '0';
end if;
end if;
end if;
if TState = "010" and READY = '1' then
DI_Reg <= DI;
end if;
end if;
end if;
end process;
end;

49
src/t80/T80_ALU.vhd
View File

@ -1,10 +1,26 @@
--------------------------------------------------------------------------------
-- ****
-- T80(c) core. Attempt to finish all undocumented features and provide
-- accurate timings.
-- Version 350.
-- Copyright (c) 2018 Sorgelig
-- Test passed: ZEXDOC, ZEXALL, Z80Full(*), Z80memptr
-- (*) Currently only SCF and CCF instructions aren't passed X/Y flags check as
-- correct implementation is still unclear.
--
-- ****
-- T80(b) core. In an effort to merge and maintain bug fixes ....
--
-- Ver 301 parity flag is just parity for 8080, also overflow for Z80, by Sean Riddle
-- Ver 300 started tidyup
-- MikeJ March 2005
-- Latest version from www.fpgaarcade.com (original www.opencores.org)
--
-- ****
-- Z80 compatible microprocessor core
--
-- Version : 0247
--
-- Copyright (c) 2001-2002 Daniel Wallner (jesus@opencores.org)
--
-- All rights reserved
--
-- Redistribution and use in source and synthezised forms, with or without
@ -45,13 +61,9 @@
-- File history :
--
-- 0214 : Fixed mostly flags, only the block instructions now fail the zex regression test
--
-- 0238 : Fixed zero flag for 16 bit SBC and ADC
--
-- 0240 : Added GB operations
--
-- 0242 : Cleanup
--
-- 0247 : Cleanup
--
@ -74,6 +86,8 @@ entity T80_ALU is
port(
Arith16 : in std_logic;
Z16 : in std_logic;
WZ : in std_logic_vector(15 downto 0);
XY_State : in std_logic_vector(1 downto 0);
ALU_Op : in std_logic_vector(3 downto 0);
IR : in std_logic_vector(5 downto 0);
ISet : in std_logic_vector(1 downto 0);
@ -93,6 +107,7 @@ architecture rtl of T80_ALU is
Carry_In : std_logic;
signal Res : out std_logic_vector;
signal Carry : out std_logic) is
variable B_i : unsigned(A'length - 1 downto 0);
variable Res_i : unsigned(A'length + 1 downto 0);
begin
@ -101,6 +116,7 @@ architecture rtl of T80_ALU is
else
B_i := unsigned(B);
end if;
Res_i := unsigned("0" & A & Carry_In) + unsigned("0" & B_i & "1");
Carry <= Res_i(A'length + 1);
Res <= std_logic_vector(Res_i(A'length downto 1));
@ -131,9 +147,18 @@ begin
AddSub(BusA(3 downto 0), BusB(3 downto 0), ALU_Op(1), ALU_Op(1) xor (UseCarry and F_In(Flag_C)), Q_v(3 downto 0), HalfCarry_v);
AddSub(BusA(6 downto 4), BusB(6 downto 4), ALU_Op(1), HalfCarry_v, Q_v(6 downto 4), Carry7_v);
AddSub(BusA(7 downto 7), BusB(7 downto 7), ALU_Op(1), Carry7_v, Q_v(7 downto 7), Carry_v);
OverFlow_v <= Carry_v xor Carry7_v;
process (Arith16, ALU_OP, F_In, BusA, BusB, IR, Q_v, Carry_v, HalfCarry_v, OverFlow_v, BitMask, ISet, Z16)
-- bug fix - parity flag is just parity for 8080, also overflow for Z80
process (Carry_v, Carry7_v, Q_v)
begin
if(Mode=2) then
OverFlow_v <= not (Q_v(0) xor Q_v(1) xor Q_v(2) xor Q_v(3) xor
Q_v(4) xor Q_v(5) xor Q_v(6) xor Q_v(7)); else
OverFlow_v <= Carry_v xor Carry7_v;
end if;
end process;
process (Arith16, ALU_OP, F_In, BusA, BusB, IR, Q_v, Carry_v, HalfCarry_v, OverFlow_v, BitMask, ISet, Z16, WZ, XY_State)
variable Q_t : std_logic_vector(7 downto 0);
variable DAA_Q : unsigned(8 downto 0);
begin
@ -271,9 +296,10 @@ begin
end if;
F_Out(Flag_H) <= '1';
F_Out(Flag_N) <= '0';
F_Out(Flag_X) <= '0';
F_Out(Flag_Y) <= '0';
if IR(2 downto 0) /= "110" then
if IR(2 downto 0) = "110" or XY_State /= "00" then
F_Out(Flag_X) <= WZ(11);
F_Out(Flag_Y) <= WZ(13);
else
F_Out(Flag_X) <= BusB(3);
F_Out(Flag_Y) <= BusB(5);
end if;
@ -347,5 +373,4 @@ begin
end case;
Q <= Q_t;
end process;
end;

152
src/t80/T80_MCode.vhd
View File

@ -1,10 +1,26 @@
--------------------------------------------------------------------------------
-- ****
-- T80(c) core. Attempt to finish all undocumented features and provide
-- accurate timings.
-- Version 350.
-- Copyright (c) 2018 Sorgelig
-- Test passed: ZEXDOC, ZEXALL, Z80Full(*), Z80memptr
-- (*) Currently only SCF and CCF instructions aren't passed X/Y flags check as
-- correct implementation is still unclear.
--
-- ****
-- T80(b) core. In an effort to merge and maintain bug fixes ....
--
-- Ver 303 add undocumented DDCB and FDCB opcodes by TobiFlex 20.04.2010
-- Ver 300 started tidyup
-- MikeJ March 2005
-- Latest version from www.fpgaarcade.com (original www.opencores.org)
--
-- ****
-- Z80 compatible microprocessor core
--
-- Version : 0242
--
-- Copyright (c) 2001-2002 Daniel Wallner (jesus@opencores.org)
--
-- All rights reserved
--
-- Redistribution and use in source and synthezised forms, with or without
@ -45,25 +61,20 @@
-- File history :
--
-- 0208 : First complete release
--
-- 0211 : Fixed IM 1
--
-- 0214 : Fixed mostly flags, only the block instructions now fail the zex regression test
--
-- 0235 : Added IM 2 fix by Mike Johnson
--
-- 0238 : Added NoRead signal
--
-- 0238b: Fixed instruction timing for POP and DJNZ
--
-- 0240 : Added (IX/IY+d) states, removed op-codes from mode 2 and added all remaining mode 3 op-codes
--
-- 0240mj1 fix for HL inc/dec for INI, IND, INIR, INDR, OUTI, OUTD, OTIR, OTDR
-- 0242 : Fixed I/O instruction timing, cleanup
--
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.numeric_std.all;
use work.T80_Pack.all;
entity T80_MCode is
generic(
@ -126,6 +137,7 @@ entity T80_MCode is
I_RLD : out std_logic;
I_RRD : out std_logic;
I_INRC : out std_logic;
SetWZ : out std_logic_vector(1 downto 0);
SetDI : out std_logic;
SetEI : out std_logic;
IMode : out std_logic_vector(1 downto 0);
@ -145,13 +157,6 @@ architecture rtl of T80_MCode is
constant aIOA : std_logic_vector(2 downto 0) := "100";
constant aSP : std_logic_vector(2 downto 0) := "101";
constant aZI : std_logic_vector(2 downto 0) := "110";
-- constant aNone : std_logic_vector(2 downto 0) := "000";
-- constant aXY : std_logic_vector(2 downto 0) := "001";
-- constant aIOA : std_logic_vector(2 downto 0) := "010";
-- constant aSP : std_logic_vector(2 downto 0) := "011";
-- constant aBC : std_logic_vector(2 downto 0) := "100";
-- constant aDE : std_logic_vector(2 downto 0) := "101";
-- constant aZI : std_logic_vector(2 downto 0) := "110";
function is_cc_true(
F : std_logic_vector(7 downto 0);
@ -160,10 +165,10 @@ architecture rtl of T80_MCode is
begin
if Mode = 3 then
case cc is
when "000" => return F(7) = '0'; -- NZ
when "001" => return F(7) = '1'; -- Z
when "010" => return F(4) = '0'; -- NC
when "011" => return F(4) = '1'; -- C
when "000" => return F(Flag_S) = '0'; -- NZ
when "001" => return F(Flag_S) = '1'; -- Z
when "010" => return F(Flag_H) = '0'; -- NC
when "011" => return F(Flag_H) = '1'; -- C
when "100" => return false;
when "101" => return false;
when "110" => return false;
@ -171,14 +176,14 @@ architecture rtl of T80_MCode is
end case;
else
case cc is
when "000" => return F(6) = '0'; -- NZ
when "001" => return F(6) = '1'; -- Z
when "010" => return F(0) = '0'; -- NC
when "011" => return F(0) = '1'; -- C
when "100" => return F(2) = '0'; -- PO
when "101" => return F(2) = '1'; -- PE
when "110" => return F(7) = '0'; -- P
when "111" => return F(7) = '1'; -- M
when "000" => return F(Flag_Z) = '0'; -- NZ
when "001" => return F(Flag_Z) = '1'; -- Z
when "010" => return F(Flag_C) = '0'; -- NC
when "011" => return F(Flag_C) = '1'; -- C
when "100" => return F(Flag_P) = '0'; -- PO
when "101" => return F(Flag_P) = '1'; -- PE
when "110" => return F(Flag_S) = '0'; -- P
when "111" => return F(Flag_S) = '1'; -- M
end case;
end if;
end;
@ -247,6 +252,7 @@ begin
NoRead <= '0';
Write <= '0';
XYbit_undoc <= '0';
SetWZ <= "00";
case ISet is
when "00" =>
@ -371,6 +377,7 @@ begin
when 1 =>
Set_Addr_To <= aBC;
Set_BusB_To <= "0111";
SetWZ <= "10";
when 2 =>
Write <= '1';
when others => null;
@ -382,6 +389,7 @@ begin
when 1 =>
Set_Addr_To <= aDE;
Set_BusB_To <= "0111";
SetWZ <= "10";
when 2 =>
Write <= '1';
when others => null;
@ -408,6 +416,7 @@ begin
LDZ <= '1';
when 3 =>
Set_Addr_To <= aZI;
SetWZ <= "10";
Inc_PC <= '1';
Set_BusB_To <= "0111";
when 4 =>
@ -638,6 +647,7 @@ begin
Set_BusA_To <= "0101";
Set_BusB_To <= "0101";
Set_Addr_To <= aSP;
LDZ <= '1';
when 3 =>
IncDec_16 <= "0111";
Set_Addr_To <= aSP;
@ -648,6 +658,7 @@ begin
Set_BusA_To <= "0100";
Set_BusB_To <= "0100";
Set_Addr_To <= aSP;
LDW <= '1';
when 5 =>
IncDec_16 <= "1111";
TStates <= "101";
@ -865,6 +876,7 @@ begin
end case;
TStates <= "100";
Arith16 <= '1';
SetWZ <= "11";
when 3 =>
NoRead <= '1';
Read_To_Reg <= '1';
@ -916,6 +928,7 @@ begin
when 3 =>
Inc_PC <= '1';
Jump <= '1';
LDW <= '1';
when others => null;
end case;
when "11000010"|"11001010"|"11010010"|"11011010"|"11100010"|"11101010"|"11110010"|"11111010" =>
@ -982,6 +995,7 @@ begin
Inc_PC <= '1';
LDZ <= '1';
when 3 =>
LDW <= '1';
Inc_PC <= '1';
if is_cc_true(F, to_bitvector(IR(5 downto 3))) then
Jump <= '1';
@ -1363,7 +1377,7 @@ begin
-- SRL r
-- SLL r (Undocumented) / SWAP r
if XY_State="00" then
if MCycle = "001" or MCycle = "111" then
if MCycle = "001" then
ALU_Op <= "1000";
Read_To_Reg <= '1';
Save_ALU <= '1';
@ -1420,7 +1434,7 @@ begin
|"01111000"|"01111001"|"01111010"|"01111011"|"01111100"|"01111101"|"01111111" =>
-- BIT b,r
if XY_State="00" then
if MCycle = "001" or MCycle = "111" then
if MCycle = "001" then
Set_BusB_To(2 downto 0) <= IR(2 downto 0);
ALU_Op <= "1001";
end if;
@ -1463,24 +1477,6 @@ begin
ALU_Op <= "1010";
Read_To_Reg <= '1';
Save_ALU <= '1';
else
MCycles <= "100";
case to_integer(unsigned(MCycle)) is
when 7 =>
Set_Addr_To <= aXY;
when 2 =>
Set_BusB_To(2 downto 0) <= "110";
ALU_Op <= "1010";
Read_To_Reg <= '1';
Save_ALU <= '1';
Set_Addr_To <= aXY;
TStates <= "100";
when 3 =>
Set_Addr_To <= aXY;
when 4 =>
Write <= '1';
when others => null;
end case;
end if;
else
-- SET b,(IX+d),Reg, undocumented
@ -1531,24 +1527,6 @@ begin
ALU_Op <= "1011";
Read_To_Reg <= '1';
Save_ALU <= '1';
else
MCycles <= "100";
case to_integer(unsigned(MCycle)) is
when 7 =>
Set_Addr_To <= aXY;
when 2 =>
Set_BusB_To(2 downto 0) <= "110";
ALU_Op <= "1011";
Read_To_Reg <= '1';
Save_ALU <= '1';
Set_Addr_To <= aXY;
TStates <= "100";
when 3 =>
Set_Addr_To <= aXY;
when 4 =>
Write <= '1';
when others => null;
end case;
end if;
else
-- RES b,(IX+d),Reg, undocumented
@ -1801,6 +1779,7 @@ begin
Set_BusB_To <= "1000";
end case;
TStates <= "100";
SetWZ <= "11";
when 3 =>
NoRead <= '1';
Read_To_Reg <= '1';
@ -1834,6 +1813,7 @@ begin
Set_BusB_To <= "1000";
end case;
TStates <= "100";
SetWZ <= "11";
when 3 =>
NoRead <= '1';
ALU_Op <= "0011";
@ -1849,46 +1829,49 @@ begin
when others =>
end case;
when "01101111" =>
-- RLD
-- RLD -- Read in M2, not M3! fixed by Sorgelig
MCycles <= "100";
case to_integer(unsigned(MCycle)) is
when 2 =>
NoRead <= '1';
when 1 =>
Set_Addr_To <= aXY;
when 3 =>
when 2 =>
Read_To_Reg <= '1';
Set_BusB_To(2 downto 0) <= "110";
Set_BusA_To(2 downto 0) <= "111";
ALU_Op <= "1101";
TStates <= "100";
Set_Addr_To <= aXY;
Save_ALU <= '1';
when 4 =>
when 3 =>
TStates <= "100";
I_RLD <= '1';
NoRead <= '1';
Set_Addr_To <= aXY;
when 4 =>
Write <= '1';
when others =>
end case;
when "01100111" =>
-- RRD
-- RRD -- Read in M2, not M3! fixed by Sorgelig
MCycles <= "100";
case to_integer(unsigned(MCycle)) is
when 2 =>
when 1 =>
Set_Addr_To <= aXY;
when 3 =>
when 2 =>
Read_To_Reg <= '1';
Set_BusB_To(2 downto 0) <= "110";
Set_BusA_To(2 downto 0) <= "111";
ALU_Op <= "1110";
TStates <= "100";
Set_Addr_To <= aXY;
Save_ALU <= '1';
when 4 =>
when 3 =>
TStates <= "100";
I_RRD <= '1';
NoRead <= '1';
Set_Addr_To <= aXY;
when 4 =>
Write <= '1';
when others =>
end case;
when "01000101"|"01001101"|"01010101"|"01011101"|"01100101"|"01101101"|"01110101"|"01111101" =>
-- RETI, RETN
-- RETI/RETN
MCycles <= "011";
case to_integer(unsigned(MCycle)) is
when 1 =>
@ -1900,6 +1883,7 @@ begin
when 3 =>
Jump <= '1';
IncDec_16 <= "0111";
LDW <= '1';
I_RETN <= '1';
when others => null;
end case;
@ -1909,6 +1893,7 @@ begin
case to_integer(unsigned(MCycle)) is
when 1 =>
Set_Addr_To <= aBC;
SetWZ <= "01";
when 2 =>
IORQ <= '1';
if IR(5 downto 3) /= "110" then
@ -1925,6 +1910,7 @@ begin
case to_integer(unsigned(MCycle)) is
when 1 =>
Set_Addr_To <= aBC;
SetWZ <= "01";
Set_BusB_To(2 downto 0) <= IR(5 downto 3);
if IR(5 downto 3) = "110" then
Set_BusB_To(3) <= '1';
@ -1939,12 +1925,15 @@ begin
MCycles <= "100";
case to_integer(unsigned(MCycle)) is
when 1 =>
TStates <= "101";
Set_Addr_To <= aBC;
Set_BusB_To <= "1010";
Set_BusA_To <= "0000";
Read_To_Reg <= '1';
Save_ALU <= '1';
ALU_Op <= "0010";
SetWZ <= "11";
IncDec_16(3) <= IR(3);
when 2 =>
IORQ <= '1';
Set_BusB_To <= "0110";
@ -1955,7 +1944,6 @@ begin
else
IncDec_16 <= "1110";
end if;
TStates <= "100";
Write <= '1';
I_BTR <= '1';
when 4 =>
@ -1978,6 +1966,8 @@ begin
when 2 =>
Set_BusB_To <= "0110";
Set_Addr_To <= aBC;
SetWZ <= "11";
IncDec_16(3) <= IR(3);
when 3 =>
if IR(3) = '0' then
IncDec_16 <= "0110";

36
src/t80/T80_Pack.vhd
View File

@ -1,3 +1,23 @@
--------------------------------------------------------------------------------
-- ****
-- T80(c) core. Attempt to finish all undocumented features and provide
-- accurate timings.
-- Version 350.
-- Copyright (c) 2018 Sorgelig
-- Test passed: ZEXDOC, ZEXALL, Z80Full(*), Z80memptr
-- (*) Currently only SCF and CCF instructions aren't passed X/Y flags check as
-- correct implementation is still unclear.
--
-- ****
-- T80(b) core. In an effort to merge and maintain bug fixes ....
--
--
-- Ver 303 add undocumented DDCB and FDCB opcodes by TobiFlex 20.04.2010
-- Ver 300 started tidyup
-- MikeJ March 2005
-- Latest version from www.fpgaarcade.com (original www.opencores.org)
--
-- ****
--
-- Z80 compatible microprocessor core
--
@ -53,7 +73,7 @@ package T80_Pack is
component T80
generic(
Mode : integer := 0; -- 0 => Z80, 1 => Fast Z80, 2 => 8080, 3 => GB
IOWait : integer := 0; -- 1 => Single cycle I/O, 1 => Std I/O cycle
IOWait : integer := 0; -- 0 => Single cycle I/O, 1 => Std I/O cycle
Flag_C : integer := 0;
Flag_N : integer := 1;
Flag_P : integer := 2;
@ -87,13 +107,7 @@ package T80_Pack is
IntCycle_n : out std_logic;
IntE : out std_logic;
Stop : out std_logic;
SavePC : out std_logic_vector(15 downto 0);
SaveINT : out std_logic_vector(7 downto 0);
RestorePC : in std_logic_vector(15 downto 0);
RestoreINT : in std_logic_vector(7 downto 0);
RestorePC_n : in std_logic
REG : out std_logic_vector(207 downto 0) -- IY, HL', DE', BC', IX, HL, DE, BC, PC, SP, R, I, F', A', F, A
);
end component;
@ -113,7 +127,8 @@ package T80_Pack is
DOBH : out std_logic_vector(7 downto 0);
DOBL : out std_logic_vector(7 downto 0);
DOCH : out std_logic_vector(7 downto 0);
DOCL : out std_logic_vector(7 downto 0)
DOCL : out std_logic_vector(7 downto 0);
DOR : out std_logic_vector(127 downto 0)
);
end component;
@ -178,6 +193,7 @@ package T80_Pack is
I_RLD : out std_logic;
I_RRD : out std_logic;
I_INRC : out std_logic;
SetWZ : out std_logic_vector(1 downto 0);
SetDI : out std_logic;
SetEI : out std_logic;
IMode : out std_logic_vector(1 downto 0);
@ -203,6 +219,8 @@ package T80_Pack is
port(
Arith16 : in std_logic;
Z16 : in std_logic;
WZ : in std_logic_vector(15 downto 0);
XY_State : in std_logic_vector(1 downto 0);
ALU_Op : in std_logic_vector(3 downto 0);
IR : in std_logic_vector(5 downto 0);
ISet : in std_logic_vector(1 downto 0);

25
src/t80/T80_Reg.vhd
View File

@ -1,3 +1,22 @@
--------------------------------------------------------------------------------
-- ****
-- T80(c) core. Attempt to finish all undocumented features and provide
-- accurate timings.
-- Version 350.
-- Copyright (c) 2018 Sorgelig
-- Test passed: ZEXDOC, ZEXALL, Z80Full(*), Z80memptr
-- (*) Currently only SCF and CCF instructions aren't passed X/Y flags check as
-- correct implementation is still unclear.
--
-- ****
-- T80(b) core. In an effort to merge and maintain bug fixes ....
--
--
-- Ver 300 started tidyup
-- MikeJ March 2005
-- Latest version from www.fpgaarcade.com (original www.opencores.org)
--
-- ****
--
-- T80 Registers, technology independent
--
@ -69,7 +88,8 @@ entity T80_Reg is
DOBH : out std_logic_vector(7 downto 0);
DOBL : out std_logic_vector(7 downto 0);
DOCH : out std_logic_vector(7 downto 0);
DOCL : out std_logic_vector(7 downto 0)
DOCL : out std_logic_vector(7 downto 0);
DOR : out std_logic_vector(127 downto 0)
);
end T80_Reg;
@ -83,7 +103,7 @@ begin
process (Clk)
begin
if Clk'event and Clk = '1' then
if rising_edge(Clk) then
if CEN = '1' then
if WEH = '1' then
RegsH(to_integer(unsigned(AddrA))) <= DIH;
@ -101,5 +121,6 @@ begin
DOBL <= RegsL(to_integer(unsigned(AddrB)));
DOCH <= RegsH(to_integer(unsigned(AddrC)));
DOCL <= RegsL(to_integer(unsigned(AddrC)));
DOR <= RegsH(7) & RegsL(7) & RegsH(6) & RegsL(6) & RegsH(5) & RegsL(5) & RegsH(4) & RegsL(4) & RegsH(3) & RegsL(3) & RegsH(2) & RegsL(2) & RegsH(1) & RegsL(1) & RegsH(0) & RegsL(0);
end;

268
src/t80/T80a.vhd
View File

@ -1,268 +0,0 @@
--
-- Z80 compatible microprocessor core, asynchronous top level
--
-- Version : 0247
--
-- Copyright (c) 2001-2002 Daniel Wallner (jesus@opencores.org)
--
-- All rights reserved
--
-- Redistribution and use in source and synthezised forms, with or without
-- modification, are permitted provided that the following conditions are met:
--
-- Redistributions of source code must retain the above copyright notice,
-- this list of conditions and the following disclaimer.
--
-- Redistributions in synthesized form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in the
-- documentation and/or other materials provided with the distribution.
--
-- Neither the name of the author nor the names of other contributors may
-- be used to endorse or promote products derived from this software without
-- specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-- POSSIBILITY OF SUCH DAMAGE.
--
-- Please report bugs to the author, but before you do so, please
-- make sure that this is not a derivative work and that
-- you have the latest version of this file.
--
-- The latest version of this file can be found at:
-- http://www.opencores.org/cvsweb.shtml/t80/
--
-- Limitations :
--
-- File history :
--
-- 0208 : First complete release
--
-- 0211 : Fixed interrupt cycle
--
-- 0235 : Updated for T80 interface change
--
-- 0238 : Updated for T80 interface change
--
-- 0240 : Updated for T80 interface change
--
-- 0242 : Updated for T80 interface change
--
-- 0247 : Fixed bus req/ack cycle
--
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.numeric_std.all;
use work.T80_Pack.all;
entity T80a is
generic(
Mode : integer := 0 -- 0 => Z80, 1 => Fast Z80, 2 => 8080, 3 => GB
);
port(
RESET_n : in std_logic;
CLK_n : in std_logic;
WAIT_n : in std_logic;
INT_n : in std_logic;
NMI_n : in std_logic;
BUSRQ_n : in std_logic;
M1_n : out std_logic;
MREQ_n : out std_logic;
IORQ_n : out std_logic;
RD_n : out std_logic;
WR_n : out std_logic;
RFSH_n : out std_logic;
HALT_n : out std_logic;
BUSAK_n : out std_logic;
A : out std_logic_vector(15 downto 0);
D : inout std_logic_vector(7 downto 0);
SavePC : out std_logic_vector(15 downto 0);
SaveINT : out std_logic_vector(7 downto 0);
RestorePC : in std_logic_vector(15 downto 0);
RestoreINT : in std_logic_vector(7 downto 0);
RestorePC_n : in std_logic
);
end T80a;
architecture rtl of T80a is
signal CEN : std_logic;
signal Reset_s : std_logic;
signal IntCycle_n : std_logic;
signal IORQ : std_logic;
signal NoRead : std_logic;
signal Write : std_logic;
signal MREQ : std_logic;
signal MReq_Inhibit : std_logic;
signal Req_Inhibit : std_logic;
signal RD : std_logic;
signal MREQ_n_i : std_logic;
signal IORQ_n_i : std_logic;
signal RD_n_i : std_logic;
signal WR_n_i : std_logic;
signal RFSH_n_i : std_logic;
signal BUSAK_n_i : std_logic;
signal A_i : std_logic_vector(15 downto 0);
signal DO : std_logic_vector(7 downto 0);
signal DI_Reg : std_logic_vector (7 downto 0); -- Input synchroniser
signal Wait_s : std_logic;
signal MCycle : std_logic_vector(2 downto 0);
signal TState : std_logic_vector(2 downto 0);
begin
CEN <= '1';
BUSAK_n <= BUSAK_n_i;
MREQ_n_i <= not MREQ or (Req_Inhibit and MReq_Inhibit);
RD_n_i <= not RD or Req_Inhibit;
MREQ_n <= MREQ_n_i when BUSAK_n_i = '1' else 'Z';
IORQ_n <= IORQ_n_i when BUSAK_n_i = '1' else 'Z';
RD_n <= RD_n_i when BUSAK_n_i = '1' else 'Z';
WR_n <= WR_n_i when BUSAK_n_i = '1' else 'Z';
RFSH_n <= RFSH_n_i when BUSAK_n_i = '1' else 'Z';
A <= A_i when BUSAK_n_i = '1' else (others => 'Z');
D <= DO when Write = '1' and BUSAK_n_i = '1' else (others => 'Z');
process (RESET_n, CLK_n)
begin
if RESET_n = '0' then
Reset_s <= '0';
elsif CLK_n'event and CLK_n = '1' then
Reset_s <= '1';
end if;
end process;
u0 : T80
generic map(
Mode => Mode,
IOWait => 1)
port map(
CEN => CEN,
M1_n => M1_n,
IORQ => IORQ,
NoRead => NoRead,
Write => Write,
RFSH_n => RFSH_n_i,
HALT_n => HALT_n,
WAIT_n => Wait_s,
INT_n => INT_n,
NMI_n => NMI_n,
RESET_n => Reset_s,
BUSRQ_n => BUSRQ_n,
BUSAK_n => BUSAK_n_i,
CLK_n => CLK_n,
A => A_i,
DInst => D,
DI => DI_Reg,
DO => DO,
MC => MCycle,
TS => TState,
IntCycle_n => IntCycle_n,
SavePC => SavePC,
SaveINT => SaveINT,
RestorePC => RestorePC,
RestoreINT => RestoreINT,
RestorePC_n => RestorePC_n );
process (CLK_n)
begin
if CLK_n'event and CLK_n = '0' then
Wait_s <= WAIT_n;
if TState = "011" and BUSAK_n_i = '1' then
DI_Reg <= to_x01(D);
end if;
end if;
end process;
process (Reset_s,CLK_n)
begin
if Reset_s = '0' then
WR_n_i <= '1';
elsif CLK_n'event and CLK_n = '1' then
WR_n_i <= '1';
if TState = "001" then -- To short for IO writes !!!!!!!!!!!!!!!!!!!
WR_n_i <= not Write;
end if;
end if;
end process;
process (Reset_s,CLK_n)
begin
if Reset_s = '0' then
Req_Inhibit <= '0';
elsif CLK_n'event and CLK_n = '1' then
if MCycle = "001" and TState = "010" then
Req_Inhibit <= '1';
else
Req_Inhibit <= '0';
end if;
end if;
end process;
process (Reset_s,CLK_n)
begin
if Reset_s = '0' then
MReq_Inhibit <= '0';
elsif CLK_n'event and CLK_n = '0' then
if MCycle = "001" and TState = "010" then
MReq_Inhibit <= '1';
else
MReq_Inhibit <= '0';
end if;
end if;
end process;
process(Reset_s,CLK_n)
begin
if Reset_s = '0' then
RD <= '0';
IORQ_n_i <= '1';
MREQ <= '0';
elsif CLK_n'event and CLK_n = '0' then
if MCycle = "001" then
if TState = "001" then
RD <= IntCycle_n;
MREQ <= IntCycle_n;
IORQ_n_i <= IntCycle_n;
end if;
if TState = "011" then
RD <= '0';
IORQ_n_i <= '1';
MREQ <= '1';
end if;
if TState = "100" then
MREQ <= '0';
end if;
else
if TState = "001" and NoRead = '0' then
RD <= not Write;
IORQ_n_i <= not IORQ;
MREQ <= not IORQ;
end if;
if TState = "011" then
RD <= '0';
IORQ_n_i <= '1';
MREQ <= '0';
end if;
end if;
end if;
end process;
end;

211
src/t80/T80pa.vhd Normal file
View File

@ -0,0 +1,211 @@
--
-- Z80 compatible microprocessor core, preudo-asynchronous top level (by Sorgelig)
--
-- Copyright (c) 2001-2002 Daniel Wallner (jesus@opencores.org)
--
-- All rights reserved
--
-- Redistribution and use in source and synthezised forms, with or without
-- modification, are permitted provided that the following conditions are met:
--
-- Redistributions of source code must retain the above copyright notice,
-- this list of conditions and the following disclaimer.
--
-- Redistributions in synthesized form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in the
-- documentation and/or other materials provided with the distribution.
--
-- Neither the name of the author nor the names of other contributors may
-- be used to endorse or promote products derived from this software without
-- specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-- POSSIBILITY OF SUCH DAMAGE.
--
-- Please report bugs to the author, but before you do so, please
-- make sure that this is not a derivative work and that
-- you have the latest version of this file.
--
-- The latest version of this file can be found at:
-- http://www.opencores.org/cvsweb.shtml/t80/
--
-- File history :
--
-- v1.0: convert to preudo-asynchronous model with original Z80 timings.
--
-- v2.0: rewritten for more precise timings.
-- support for both CEN_n and CEN_p set to 1. Effective clock will be CLK/2.
--
-- v2.1: Output Address 0 during non-bus MCycle (fix ZX contention)
--
-- v2.2: Interrupt acknowledge cycle has been corrected
-- WAIT_n is broken in T80.vhd. Simulate correct WAIT_n locally.
--
-- v2.3: Output last used Address during non-bus MCycle seems more correct.
--
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.numeric_std.all;
use work.T80_Pack.all;
entity T80pa is
generic(
Mode : integer := 0 -- 0 => Z80, 1 => Fast Z80, 2 => 8080, 3 => GB
);
port(
RESET_n : in std_logic;
CLK : in std_logic;
CEN_p : in std_logic := '1';
CEN_n : in std_logic := '1';
WAIT_n : in std_logic := '1';
INT_n : in std_logic := '1';
NMI_n : in std_logic := '1';
BUSRQ_n : in std_logic := '1';
M1_n : out std_logic;
MREQ_n : out std_logic;
IORQ_n : out std_logic;
RD_n : out std_logic;
WR_n : out std_logic;
RFSH_n : out std_logic;
HALT_n : out std_logic;
BUSAK_n : out std_logic;
A : out std_logic_vector(15 downto 0);
DI : in std_logic_vector(7 downto 0);
DO : out std_logic_vector(7 downto 0);
REG : out std_logic_vector(207 downto 0) -- IY, HL', DE', BC', IX, HL, DE, BC, PC, SP, R, I, F', A', F, A
);
end T80pa;
architecture rtl of T80pa is
signal IntCycle_n : std_logic;
signal IntCycleD_n : std_logic_vector(1 downto 0);
signal IORQ : std_logic;
signal NoRead : std_logic;
signal Write : std_logic;
signal BUSAK : std_logic;
signal DI_Reg : std_logic_vector (7 downto 0); -- Input synchroniser
signal MCycle : std_logic_vector(2 downto 0);
signal TState : std_logic_vector(2 downto 0);
signal CEN_pol : std_logic;
signal A_int : std_logic_vector(15 downto 0);
signal A_last : std_logic_vector(15 downto 0);
begin
A <= A_int when NoRead = '0' or Write = '1' else A_last;
BUSAK_n <= BUSAK;
u0 : T80
generic map(
Mode => Mode,
IOWait => 1
)
port map(
CEN => CEN_p and not CEN_pol,
M1_n => M1_n,
IORQ => IORQ,
NoRead => NoRead,
Write => Write,
RFSH_n => RFSH_n,
HALT_n => HALT_n,
WAIT_n => '1',
INT_n => INT_n,
NMI_n => NMI_n,
RESET_n => RESET_n,
BUSRQ_n => BUSRQ_n,
BUSAK_n => BUSAK,
CLK_n => CLK,
A => A_int,
DInst => DI, -- valid at beginning of T3
DI => DI_Reg, -- latched at middle of T3
DO => DO,
REG => REG,
MC => MCycle,
TS => TState,
IntCycle_n => IntCycle_n
);
process(CLK)
begin
if rising_edge(CLK) then
if RESET_n = '0' then
WR_n <= '1';
RD_n <= '1';
IORQ_n <= '1';
MREQ_n <= '1';
DI_Reg <= "00000000";
CEN_pol <= '0';
elsif CEN_p = '1' and CEN_pol = '0' then
CEN_pol <= '1';
if MCycle = "001" then
if TState = "010" then
IORQ_n <= '1';
MREQ_n <= '1';
RD_n <= '1';
end if;
else
if TState = "001" and IORQ = '1' then
WR_n <= not Write;
RD_n <= Write;
IORQ_n <= '0';
end if;
end if;
elsif CEN_n = '1' and CEN_pol = '1' then
if TState = "010" then
CEN_pol <= not WAIT_n;
else
CEN_pol <= '0';
end if;
if TState = "011" and BUSAK = '1' then
DI_Reg <= DI;
end if;
if MCycle = "001" then
if TState = "001" then
IntCycleD_n <= IntCycleD_n(0) & IntCycle_n;
RD_n <= not IntCycle_n;
MREQ_n <= not IntCycle_n;
IORQ_n <= IntCycleD_n(1);
A_last <= A_int;
end if;
if TState = "011" then
IntCycleD_n <= "11";
RD_n <= '1';
MREQ_n <= '0';
end if;
if TState = "100" then
MREQ_n <= '1';
end if;
else
if NoRead = '0' and IORQ = '0' then
if TState = "001" then
RD_n <= Write;
MREQ_n <= '0';
A_last <= A_int;
end if;
end if;
if TState = "010" then
WR_n <= not Write;
end if;
if TState = "011" then
WR_n <= '1';
RD_n <= '1';
IORQ_n <= '1';
MREQ_n <= '1';
end if;
end if;
end if;
end if;
end process;
end;

23
src/t80/T80s.vhd
View File

@ -79,11 +79,11 @@ entity T80s is
port(
RESET_n : in std_logic;
CLK_n : in std_logic;
CEN : in std_logic;
WAIT_n : in std_logic;
INT_n : in std_logic;
NMI_n : in std_logic;
BUSRQ_n : in std_logic;
CEN : in std_logic := '1';
WAIT_n : in std_logic := '1';
INT_n : in std_logic := '1';
NMI_n : in std_logic := '1';
BUSRQ_n : in std_logic := '1';
M1_n : out std_logic;
MREQ_n : out std_logic;
IORQ_n : out std_logic;
@ -135,14 +135,8 @@ begin
DO => DO,
MC => MCycle,
TS => TState,
IntCycle_n => IntCycle_n,
SavePC => open,
SaveINT => open,
RestorePC => (others => '1'),
RestoreINT => (others => '1'),
RestorePC_n => '1' );
IntCycle_n => IntCycle_n
);
process (RESET_n, CLK_n)
begin
@ -152,7 +146,7 @@ begin
IORQ_n <= '1';
MREQ_n <= '1';
DI_Reg <= "00000000";
elsif CLK_n'event and CLK_n = '1' then
elsif rising_edge(CLK_n) then
if CEN = '1' then
RD_n <= '1';
WR_n <= '1';
@ -193,5 +187,4 @@ begin
end if;
end if;
end process;
end;

200
src/t80/T80se.vhd
View File

@ -1,200 +0,0 @@
--
-- Z80 compatible microprocessor core, synchronous top level with clock enable
-- Different timing than the original z80
-- Inputs needs to be synchronous and outputs may glitch
--
-- Version : 0242
--
-- Copyright (c) 2001-2002 Daniel Wallner (jesus@opencores.org)
--
-- All rights reserved
--
-- Redistribution and use in source and synthezised forms, with or without
-- modification, are permitted provided that the following conditions are met:
--
-- Redistributions of source code must retain the above copyright notice,
-- this list of conditions and the following disclaimer.
--
-- Redistributions in synthesized form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in the
-- documentation and/or other materials provided with the distribution.
--
-- Neither the name of the author nor the names of other contributors may
-- be used to endorse or promote products derived from this software without
-- specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-- POSSIBILITY OF SUCH DAMAGE.
--
-- Please report bugs to the author, but before you do so, please
-- make sure that this is not a derivative work and that
-- you have the latest version of this file.
--
-- The latest version of this file can be found at:
-- http://www.opencores.org/cvsweb.shtml/t80/
--
-- Limitations :
--
-- File history :
--
-- 0235 : First release
--
-- 0236 : Added T2Write generic
--
-- 0237 : Fixed T2Write with wait state
--
-- 0238 : Updated for T80 interface change
--
-- 0240 : Updated for T80 interface change
--
-- 0242 : Updated for T80 interface change
--
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.numeric_std.all;
use work.T80_Pack.all;
entity T80se is
generic(
Mode : integer := 0; -- 0 => Z80, 1 => Fast Z80, 2 => 8080, 3 => GB
T2Write : integer := 1; -- 0 => WR_n active in T3, /=0 => WR_n active in T2
IOWait : integer := 1 -- 0 => Single cycle I/O, 1 => Std I/O cycle
);
port(
RESET_n : in std_logic;
CLK_n : in std_logic;
CLKEN : in std_logic;
WAIT_n : in std_logic;
INT_n : in std_logic;
NMI_n : in std_logic;
BUSRQ_n : in std_logic;
M1_n : out std_logic;
MREQ_n : out std_logic;
IORQ_n : out std_logic;
RD_n : out std_logic;
WR_n : out std_logic;
RFSH_n : out std_logic;
HALT_n : out std_logic;
BUSAK_n : out std_logic;
A : out std_logic_vector(15 downto 0);
DI : in std_logic_vector(7 downto 0);
DO : out std_logic_vector(7 downto 0);
SavePC : out std_logic_vector(15 downto 0);
SaveINT : out std_logic_vector(7 downto 0);
RestorePC : in std_logic_vector(15 downto 0);
RestoreINT : in std_logic_vector(7 downto 0);
RestorePC_n : in std_logic
);
end T80se;
architecture rtl of T80se is
signal IntCycle_n : std_logic;
signal NoRead : std_logic;
signal Write : std_logic;
signal IORQ : std_logic;
signal DI_Reg : std_logic_vector(7 downto 0);
signal MCycle : std_logic_vector(2 downto 0);
signal TState : std_logic_vector(2 downto 0);
begin
u0 : T80
generic map(
Mode => Mode,
IOWait => IOWait)
port map(
CEN => CLKEN,
M1_n => M1_n,
IORQ => IORQ,
NoRead => NoRead,
Write => Write,
RFSH_n => RFSH_n,
HALT_n => HALT_n,
WAIT_n => Wait_n,
INT_n => INT_n,
NMI_n => NMI_n,
RESET_n => RESET_n,
BUSRQ_n => BUSRQ_n,
BUSAK_n => BUSAK_n,
CLK_n => CLK_n,
A => A,
DInst => DI,
DI => DI_Reg,
DO => DO,
MC => MCycle,
TS => TState,
IntCycle_n => IntCycle_n,
SavePC => SavePC,
SaveINT => SaveINT,
RestorePC => RestorePC,
RestoreINT => RestoreINT,
RestorePC_n => RestorePC_n );
process (CLK_n)
begin
if CLK_n'event and CLK_n = '1' then
if RESET_n = '0' then
RD_n <= '1';
WR_n <= '1';
IORQ_n <= '1';
MREQ_n <= '1';
DI_Reg <= "00000000";
elsif CLKEN = '1' then
RD_n <= '1';
WR_n <= '1';
IORQ_n <= '1';
MREQ_n <= '1';
if MCycle = "001" then
if TState = "001" or TState = "010" then
RD_n <= not IntCycle_n;
MREQ_n <= not IntCycle_n;
IORQ_n <= IntCycle_n;
end if;
if TState = "011" then
MREQ_n <= '0';
end if;
else
if (TState = "001" or TState = "010") and NoRead = '0' and Write = '0' then
RD_n <= '0';
IORQ_n <= not IORQ;
MREQ_n <= IORQ;
end if;
if T2Write = 0 then
if TState = "010" and Write = '1' then
WR_n <= '0';
IORQ_n <= not IORQ;
MREQ_n <= IORQ;
end if;
else
if (TState = "001" or TState = "010") and Write = '1' then
WR_n <= '0';
IORQ_n <= not IORQ;
MREQ_n <= IORQ;
end if;
end if;
end if;
if TState = "010" and Wait_n = '1' then
DI_Reg <= DI;
end if;
end if;
end if;
end process;
end;

30
src/tsconf.v
View File

@ -329,24 +329,20 @@ zclock TS02
.turbo(turbo)
);
T80s #(.mode(0), .t2write(1), .iowait(1)) z80_unit
T80s CPU
(
.reset_n((~reset)),
.clk_n(zclk),
.cen(1),
.wait_n(1),
.int_n(cpu_int_n_TS),
.nmi_n(1),
.busrq_n(1),
.m1_n(cpu_m1_n),
.mreq_n(cpu_mreq_n),
.iorq_n(cpu_iorq_n),
.rd_n(cpu_rd_n),
.wr_n(cpu_wr_n),
.rfsh_n(cpu_rfsh_n),
.a(cpu_a_bus),
.di(cpu_di_bus),
.do(cpu_do_bus)
.RESET_n(~reset),
.CLK_n(zclk),
.INT_n(cpu_int_n_TS),
.M1_n(cpu_m1_n),
.MREQ_n(cpu_mreq_n),
.IORQ_n(cpu_iorq_n),
.RD_n(cpu_rd_n),
.WR_n(cpu_wr_n),
.RFSH_n(cpu_rfsh_n),
.A(cpu_a_bus),
.DI(cpu_di_bus),
.DO(cpu_do_bus)
);
zsignals TS04