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chroma_gen: add comment how to calculate carrier

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UzixLS
2021-04-25 12:25:50 +03:00
parent 18ce943940
commit 28dee07e0c
1 changed files with 3 additions and 0 deletions
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3
cpld/chroma_gen.v
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@ -57,6 +57,9 @@ localparam NTSC_CARRIER =
(CLK_FREQ == 40_000_000)? 5865 : // 166.91 error
0;
// localparam PAL_CARRIER = 64'd17_734_475 * (1<<(CARRIER_WIDTH-1)) / CLK_FREQ;
// localparam NTSC_CARRIER = 64'd14_318_180 * (1<<(CARRIER_WIDTH-1)) / CLK_FREQ;
reg [CARRIER_WIDTH:0] carrier;
wire [31:0] carrier_next;
reg [3:0] burst_cnt;