From 28dee07e0c3d18d411eb02d3cffd80b7bd41fa2d Mon Sep 17 00:00:00 2001 From: UzixLS Date: Sun, 25 Apr 2021 12:25:50 +0300 Subject: [PATCH] chroma_gen: add comment how to calculate carrier --- cpld/chroma_gen.v | 3 +++ 1 file changed, 3 insertions(+) diff --git a/cpld/chroma_gen.v b/cpld/chroma_gen.v index b41889c..c5fa411 100644 --- a/cpld/chroma_gen.v +++ b/cpld/chroma_gen.v @@ -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;