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soc/audio: Align DC toggle with actual data from PCM path #118

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merged 1 commit into from
Nov 15, 2019
Merged

soc/audio: Align DC toggle with actual data from PCM path #118

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10 changes: 9 additions & 1 deletion soc/audio/audio_mix.v
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Original file line number Diff line number Diff line change
Expand Up @@ -70,6 +70,7 @@ module audio_mix (
reg [35:0] pa_l;
reg [35:0] pa_r;

reg pcm_ena_1, pcm_ena_2;
reg [15:0] pdm_offset;

// PCM volume
Expand All @@ -93,9 +94,16 @@ module audio_mix (
assign out_l = pa_l[23:8];
assign out_r = pa_r[23:8];

// Align PCM enable
always @(posedge clk)
begin
pcm_ena_1 <= pcm_ena;
pcm_ena_2 <= pcm_ena_1;
end

// Apply variable DC offset for PDM output
always @(*)
if (pcm_ena | force_pdm_offset)
if (pcm_ena_2 | force_pdm_offset)
pdm_offset = 16'h8000;
else if (synth_dc[11:10] != 2'b00)
pdm_offset = 16'h8000;
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