`timescale 1ns/1ps
module VGA_Driver #(parameter IMAGE_X = 1056,
IMAGE_Y = 628,
H_FRONT = 40,
H_BACK = 88,
HSYNC_L = 128,
V_FRONT = 1,
V_BACK = 23,
VSYNC_L = 4,
DATAWIDTH = 8,
OUTPUT_REG = 0
)
(
input clk,
input rst_n,
input[DATAWIDTH-1:0] Rin,
input[DATAWIDTH-1:0] Gin,
input[DATAWIDTH-1:0] Bin,
output reg data_req,
output reg vsync,
output reg hsync,
output reg de,
output reg[DATAWIDTH-1:0] Rout,
output reg[DATAWIDTH-1:0] Gout,
output reg[DATAWIDTH-1:0] Bout
);
reg[12:0] hcnt; reg[12:0] vcnt;
always@(posedge clk or negedge rst_n)
begin
if(~rst_n)
hcnt <= 13‘d0;
else if(hcnt==IMAGE_X-1)
hcnt <= 13‘d0;
else
hcnt <= hcnt + 13‘d1;
end
always@(posedge clk or negedge rst_n)
begin
if(~rst_n)
vcnt <= 12‘d0;
else if(hcnt==IMAGE_X-1)
begin
if(vcnt==IMAGE_Y-1)
vcnt <= 12‘d0;
else
vcnt <= vcnt + 12‘d1;
end
end
always@(posedge clk or negedge rst_n)
begin
if(~rst_n)
hsync <= 1‘b0;
else if((hcnt>=H_FRONT-1)&&(hcnt<H_FRONT+HSYNC_L-1))
hsync <= 1‘b1;
else
hsync <= 1‘b0;
end
always@(posedge clk or negedge rst_n)
begin
if(~rst_n)
vsync <= 1‘b0;
else if(hcnt==IMAGE_X-1)
begin
if((vcnt>=V_FRONT-1) && (vcnt< V_FRONT+VSYNC_L-1))
vsync <= 1‘b1;
else vsync <= 1‘b0;
end
end
always@(posedge clk or negedge rst_n)
begin
if(~rst_n)
de <= 1‘b0;
else if(vcnt<V_FRONT+VSYNC_L+V_BACK)
de <= 1‘b0;
else if((hcnt>=H_FRONT+HSYNC_L+H_BACK-1)&&(hcnt<IMAGE_X-1))
de <= 1‘b1;
else
de <= 1‘b0;
end
always@(posedge clk or negedge rst_n)
begin
if(~rst_n)
data_req <= 1‘b0;
else if(vcnt<V_FRONT+VSYNC_L+V_BACK)
data_req <= 1‘b0;
else if((hcnt>=H_FRONT+HSYNC_L+H_BACK-OUTPUT_REG-2)&& (hcnt<IMAGE_X-2-OUTPUT_REG))
data_req <= 1‘b1;
else data_req <= 1‘b0;
end
always@(posedge clk or negedge rst_n)
begin
if(~rst_n)
Rout <= 10‘d0;
else
Rout <= Rin;
end
always@(posedge clk or negedge rst_n)
begin
if(~rst_n)
Gout <= 10‘d0;
else
Gout <= Gin;
end
always@(posedge clk or negedge rst_n)
begin
if(~rst_n)
Bout <= 10‘d0;
else
Bout <= Bin;
end
endmodule
原文地址：http://www.cnblogs.com/wuqingjianke/p/3932613.html
