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Update sys.

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sorgelig
2019-03-07 20:55:56 +08:00
parent defa3b88ca
commit 55487f158b
40 changed files with 4945 additions and 8940 deletions
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126
sys/spdif.v
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@ -31,132 +31,6 @@
// altera message_off 10240
module spdif
//-----------------------------------------------------------------
// Params
//-----------------------------------------------------------------
#(
parameter CLK_RATE = 50000000,
parameter AUDIO_RATE = 48000,
// Generated params
parameter WHOLE_CYCLES = (CLK_RATE) / (AUDIO_RATE*128),
parameter ERROR_BASE = 10000,
parameter [63:0] ERRORS_PER_BIT = ((CLK_RATE * ERROR_BASE) / (AUDIO_RATE*128)) - (WHOLE_CYCLES * ERROR_BASE)
)
//-----------------------------------------------------------------
// Ports
//-----------------------------------------------------------------
(
input clk_i,
input rst_i,
input half_rate,
// Output
output spdif_o,
// Audio interface (16-bit x 2 = RL)
input [15:0] audio_r,
input [15:0] audio_l,
output sample_req_o
);
reg lpf_ce;
always @(negedge clk_i) begin
reg [3:0] div;
div <= div + 1'd1;
if(div == 13) div <= 0;
lpf_ce <= !div;
end
wire [15:0] al, ar;
lpf48k #(15) lpf_l
(
.RESET(rst_i),
.CLK(clk_i),
.CE(lpf_ce),
.ENABLE(1),
.IDATA(audio_l),
.ODATA(al)
);
lpf48k #(15) lpf_r
(
.RESET(rst_i),
.CLK(clk_i),
.CE(lpf_ce),
.ENABLE(1),
.IDATA(audio_r),
.ODATA(ar)
);
reg bit_clk_q;
// Clock pulse generator
always @ (posedge rst_i or posedge clk_i) begin
reg [31:0] count_q;
reg [31:0] error_q;
reg ce;
if (rst_i) begin
count_q <= 0;
error_q <= 0;
bit_clk_q <= 1;
ce <= 0;
end
else
begin
if(count_q == WHOLE_CYCLES-1) begin
if (error_q < (ERROR_BASE - ERRORS_PER_BIT)) begin
error_q <= error_q + ERRORS_PER_BIT[31:0];
count_q <= 0;
end else begin
error_q <= error_q + ERRORS_PER_BIT[31:0] - ERROR_BASE;
count_q <= count_q + 1;
end
end else if(count_q == WHOLE_CYCLES) begin
count_q <= 0;
end else begin
count_q <= count_q + 1;
end
bit_clk_q <= 0;
if(!count_q) begin
ce <= ~ce;
if(~half_rate || ce) bit_clk_q <= 1;
end
end
end
//-----------------------------------------------------------------
// Core SPDIF
//-----------------------------------------------------------------
wire [31:0] sample_i = {ar, al};
spdif_core
u_core
(
.clk_i(clk_i),
.rst_i(rst_i),
.bit_out_en_i(bit_clk_q),
.spdif_o(spdif_o),
.sample_i(sample_i),
.sample_req_o(sample_req_o)
);
endmodule
module spdif_core
(
input clk_i,
input rst_i,