写出此代码module VGAsig (Clk40M,iRst_n,VGA_HS, VGA_VS ,H_Loc, V_Loc,VGA_BLANK_N,VGA_SYNC_N); input Clk40M; input iRst_n; output reg VGA_HS; output reg VGA_VS; output wire VGA_SYNC_N; output reg VGA_BLANK_N; output wire[10:0]H_Loc; output wire [9:0]V_Loc; reg [10:0] h_cnt; //行计数器,作为行坐标 reg [9:0] v_cnt; //列计数器,作为列坐标 parameter H_SYNCTIME =128, H_BACK =88, H_PIXELS =800, H_FRONT =40, H_PERIOD =1056; parameter V_SYNCTIME =4, V_BACK =23, V_LINES =600, V_FRONT =1, V_PERIOD =628;//------------------- 行场的计数------------------- always @(posedge Clk40M or negedge iRst_n) begin if(iRst_n==1'b0) h_cnt<=1'b0; else if(h_cnt == H_PERIOD-1) h_cnt<=1'b0; else h_cnt<=h_cnt+1; end always @(posedge Clk40M or negedge iRst_n) begin if(iRst_n==1'b0) v_cnt<=1'b0; else if(v_cnt==V_PERIOD-1) v_cnt<=1'b0; else if ( h_cnt==H_PERIOD-1 ) v_cnt<=v_cnt+1; end//-------------------同步信号产生------------------- always @(posedge Clk40M or negedge iRst_n) begin if(iRst_n==1'b0) VGA_HS<=1'b1; else if(h_cnt>=( H_PIXELS + H_FRONT)&& h_cnt <=( H_PIXELS + H_FRONT + H_SYNCTIME -1) ) VGA_HS <=1'b0; //--此处 840~967 为行同步区 else VGA_HS <=1'b1; end always @(posedge Clk40M or negedge iRst_n) begin if(iRst_n==1'b0) VGA_VS<=1'b1; else if(v_cnt>=( V_LINES + V_FRONT)&& v_cnt <=( V_LINES + V_FRONT + V_SYNCTIME -1) ) VGA_VS <=1'b0; //此处 601~604 为场同步区 else VGA_VS <=1'b1; end always @(posedge Clk40M )//产生送入 ADV7123 的复合消隐信号 VGA_BLANK_N,当不在有效显示区时,VGA_BLANK_N 输出低电平;反之,输出高电平; begin if (h_cnt >= H_PIXELS | v_cnt >= V_LINES) VGA_BLANK_N <= 1'b0; // H_PIXELS 为 800,V_LINES 为 600 else VGA_BLANK_N <= 1'b1; end//------------------- 行场像素位置输出------------------- assign H_Loc=h_cnt; assign V_Loc=v_cnt; assign VGA_SYNC_N=(VGA_VS & VGA_HS); endmodule的激励文件
时间: 2023-07-16 09:12:08 浏览: 204
由于没有具体的模块调用,以下是一个简单的测试模块,可以模拟VGA信号的计数器和同步信号的产生:
```
module VGAsig_tb;
reg Clk40M;
reg iRst_n;
wire VGA_HS;
wire VGA_VS;
wire [10:0] H_Loc;
wire [9:0] V_Loc;
wire VGA_BLANK_N;
wire VGA_SYNC_N;
VGAsig dut (
.Clk40M(Clk40M),
.iRst_n(iRst_n),
.VGA_HS(VGA_HS),
.VGA_VS(VGA_VS),
.H_Loc(H_Loc),
.V_Loc(V_Loc),
.VGA_BLANK_N(VGA_BLANK_N),
.VGA_SYNC_N(VGA_SYNC_N)
);
initial begin
iRst_n = 0;
Clk40M = 0;
#10 iRst_n = 1;
#20 Clk40M = 1;
#20 Clk40M = 0;
#20 Clk40M = 1;
#20 Clk40M = 0;
#20 Clk40M = 1;
#20 Clk40M = 0;
#20 Clk40M = 1;
#20 Clk40M = 0;
#500 $finish;
end
endmodule
```
该测试模块会在时钟信号上进行计数,并检查同步信号是否正确产生,以及像素位置是否正确输出。其中,iRst_n 为复位信号,Clk40M 为40MHz的时钟信号。测试时,需要使用仿真工具运行该模块,以查看输出结果是否符合预期。
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