MacPlus_MiSTer/sys/i2s.v

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2019-03-08 21:31:23 +00:00
module i2s
#(
parameter AUDIO_DW = 16
)
(
input reset,
input clk,
input ce,
output reg sclk,
output reg lrclk,
output reg sdata,
input [AUDIO_DW-1:0] left_chan,
input [AUDIO_DW-1:0] right_chan
);
always @(posedge clk) begin
reg [7:0] bit_cnt;
reg msclk;
reg [AUDIO_DW-1:0] left;
reg [AUDIO_DW-1:0] right;
if (reset) begin
bit_cnt <= 1;
lrclk <= 1;
sclk <= 1;
msclk <= 1;
end
else begin
sclk <= msclk;
if(ce) begin
msclk <= ~msclk;
if(msclk) begin
if(bit_cnt >= AUDIO_DW) begin
bit_cnt <= 1;
lrclk <= ~lrclk;
if(lrclk) begin
left <= left_chan;
right <= right_chan;
end
end
else begin
bit_cnt <= bit_cnt + 1'd1;
end
sdata <= lrclk ? right[AUDIO_DW - bit_cnt] : left[AUDIO_DW - bit_cnt];
end
end
end
end
endmodule