csc.v

完成ITUR656标准的视频流数据向RGB格式的转换。

module  csc(clock,clocken,reset,y,cr,cb,r,g,b);
    parameter OUTSIZE=8;
input clock,clocken,reset;
input  [OUTSIZE-1:0] y,cr,cb;
output   reg [OUTSIZE-1:0] r,g,b;
 reg[17:0]r_full,g_full,b_full;

//R的转换部分R=（1/256)*(298*y+409*cr-57065)
wire [17:0] r_kcm_y,r_kcm_cb,r_kcm_cr;
//实现对乘法模块的调用
mult #(8,18,298)  uut4(.clock(clock),.clocken(clocken),.reset(reset),.color(y),.color_out(r_kcm_y));
mult #(8,18,0)  uut5(.clock(clock),.clocken(clocken),.reset(reset),.color(cb),.color_out(r_kcm_cb));
mult #(8,18,409)  uut6(.clock(clock),.clocken(clocken),.reset(reset),.color(cr),.color_out(r_kcm_cr));

//常数与cr加法部分
reg [17:0] r_cr_c,r_y_cb;
always@(posedge clock or posedge reset)
begin :r_cr_c_adder

 if(reset)
r_cr_c<=0;
else if(clocken)
r_cr_c<=r_kcm_cr-57065;
end
//前两项相加
always@(posedge clock or posedge reset)
begin :r_y_cb_adder

 if(reset)
r_y_cb<=0;
else if(clocken)
r_y_cb<=r_kcm_y+r_kcm_cb;
end

always@(posedge clock or posedge reset)
begin:add

if(reset)  r_full<=0;
else if(clocken)
r_full<=r_y_cb+r_cr_c;
end

//G的转换部分G = (1/256) * ( 298*Y - 100*Cb - 208*Cr + 34718 )
wire [17:0] g_kcm_y,g_kcm_cb,g_kcm_cr;
mult #(8,18,298)  uut1(.clock(clock),.clocken(clocken),.reset(reset),.color(y),.color_out(g_kcm_y));
mult #(8,18,100)  uut2(.clock(clock),.clocken(clocken),.reset(reset),.color(cb),.color_out(g_kcm_cb));
mult #(8,18,208)  uut3(.clock(clock),.clocken(clocken),.reset(reset),.color(cr),.color_out(g_kcm_cr));
//常数与cr加法部分
reg [17:0] g_cr_c;
reg [17:0] g_y_cb;
always@(posedge clock or posedge reset)
begin :g_cr_c_adder

 if(reset)
g_cr_c<=0;
else if(clocken)
g_cr_c<=34718-g_kcm_cr;
end
//前两项相加sim:/yuv_rgb_tb
always@(posedge clock or posedge reset)
begin :g_y_cb_adder

 if(reset)
g_y_cb<=0;
else if(clocken)
g_y_cb<=g_kcm_y-g_kcm_cb;
end

always@(posedge clock or posedge reset)
begin:g_add
if(reset)  g_full<=0;
else if(clocken)
g_full<=g_y_cb+g_cr_c;
end


//B的转换部分B = (1/256) * ( 298*Y + 516*Cb - 70861 )；
wire [17:0] b_kcm_y,b_kcm_cb,b_kcm_cr;
mult #(8,18,298)  uut7(.clock(clock),.clocken(clocken),.reset(reset),.color(y),.color_out(b_kcm_y));
mult #(8,18,516)  uut8(.clock(clock),.clocken(clocken),.reset(reset),.color(cb),.color_out(b_kcm_cb));
mult #(8,18,0)  uut9(.clock(clock),.clocken(clocken),.reset(reset),.color(cr),.color_out(b_kcm_cr));
reg [17:0] b_cr_c;
reg [17:0] b_y_cb;
always@(posedge clock or posedge reset)
begin :b_cr_c_adder

 if(reset)
b_cr_c<=0;
else if(clocken)
b_cr_c<=b_kcm_cr-70861;
end

always@(posedge clock or posedge reset)
begin :b_y_cb_adder

 if(reset)
b_y_cb<=0;
else if(clocken)
b_y_cb<=b_kcm_y+b_kcm_cb;
end

always@(posedge clock or posedge reset)
begin:b_add
if(reset)
b_full<=0;
else if(clocken)
b_full<=b_y_cb+b_cr_c;
end

always@(r_full or g_full or b_full)
begin
if(g_full[17]) g=0;
else if(g_full[16])  g=255;
else g=g_full[15:8];
end


always@(r_full or g_full or b_full)
begin
if(b_full[17]) g=0;
else if(b_full[16])  g=255;
else b=b_full[15:8];
end

//实现除以256的功能
always@(r_full or g_full or b_full)
begin
if(r_full[17]) r=0;
else if(r_full[16])  r=255;
else r=r_full[15:8];
end

endmodule