uzix/zx-sizif-512-ext
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fix tsfm port decoding

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UzixLS
2022-01-28 20:20:12 +03:00
parent b0798eb952
commit a01d8222c3
2 changed files with 5 additions and 4 deletions
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9
cpld/rtl/top.v
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@ -78,8 +78,9 @@ wire [7:0] magic_port_d = {5'b00000, cfg[2:0]};
/* TURBO SOUND FM */
wire port_bffd = a[15:13] == 3'b101 && a[7:0] == 8'hFD && ym_ena;
wire port_fffd = a[15:13] == 3'b111 && a[7:0] == 8'hFD && ym_ena;
wire port_bffd = a[15:14] == 2'b10 && a[1:0] == 2'b01 && ym_ena;
wire port_fffd = a[15:14] == 2'b11 && a[1:0] == 2'b01 && ym_ena;
wire port_fffd_full = a[15:13] == 3'b111 && a[1:0] == 2'b01 && ym_ena; // required for compatibility with #dffd port
reg ym_chip_sel, ym_get_stat;
wire ym_a0 = (~n_rd & a[14] & ~ym_get_stat) | (~n_wr & ~a[14]);
assign n_ym1_cs = ~(~ym_chip_sel && (port_bffd || port_fffd) && ~n_iorq && n_m1);
@ -286,11 +287,11 @@ assign n_romcsb = 1'bz;
assign n_wait = 1'bz;
assign n_busrq = 1'bz;
assign n_iorqge = (port_fffd || port_bffd)? 1'b1 : 1'bz;
assign n_iorqge = (n_m1 && (port_fffd_full || port_bffd))? 1'b1 : 1'bz;
assign d =
~n_rd && ~n_iorq && magic_port? magic_port_d :
~n_rd && ~n_iorq && port_fffd? ad :
~n_rd && ~n_iorq && port_fffd_full? ad :
~n_rd && ~n_iorq && port_b3? gs_reg03 :
~n_rd && ~n_iorq && port_bb? gs_status :
8'bzzzzzzzz;