如果想在显示器输出一个绿色方块,请写出相应的VERILOG代码
时间: 2024-02-11 21:04:31 浏览: 60
以下是一个简单的Verilog代码实现,用于在显示器上输出一个绿色方块:
```
module vga_output(
input clk,
input [9:0] h_count,
input [8:0] v_count,
output reg [3:0] red,
output reg [3:0] green,
output reg [3:0] blue,
output reg h_sync,
output reg v_sync
);
// VGA timing parameters
parameter H_FRONT_PORCH = 16;
parameter H_SYNC_WIDTH = 96;
parameter H_BACK_PORCH = 48;
parameter H_DISPLAY = 640;
parameter V_FRONT_PORCH = 10;
parameter V_SYNC_WIDTH = 2;
parameter V_BACK_PORCH = 33;
parameter V_DISPLAY = 480;
// Horizontal counters
reg [3:0] h_sync_count = 0;
reg [3:0] h_back_porch_count = 0;
reg [3:0] h_display_count = 0;
reg [3:0] h_front_porch_count = 0;
// Vertical counters
reg [3:0] v_sync_count = 0;
reg [3:0] v_back_porch_count = 0;
reg [3:0] v_display_count = 0;
reg [3:0] v_front_porch_count = 0;
// Sync signals
reg h_sync = 1;
reg v_sync = 1;
// Color signals
reg [3:0] red = 0;
reg [3:0] green = 0;
reg [3:0] blue = 0;
always @(posedge clk) begin
// Horizontal counters
if (h_sync_count < H_SYNC_WIDTH) begin
h_sync_count <= h_sync_count + 1;
h_sync <= 0;
end else if (h_back_porch_count < H_BACK_PORCH) begin
h_back_porch_count <= h_back_porch_count + 1;
h_sync <= 0;
end else if (h_display_count < H_DISPLAY) begin
h_display_count <= h_display_count + 1;
red <= 0;
green <= 7; // set green to maximum value
blue <= 0;
h_sync <= 1;
end else if (h_front_porch_count < H_FRONT_PORCH) begin
h_front_porch_count <= h_front_porch_count + 1;
h_sync <= 0;
end else begin
h_sync_count <= 0;
h_back_porch_count <= 0;
h_display_count <= 0;
h_front_porch_count <= 0;
end
// Vertical counters
if (v_sync_count < V_SYNC_WIDTH) begin
v_sync_count <= v_sync_count + 1;
v_sync <= 0;
end else if (v_back_porch_count < V_BACK_PORCH) begin
v_back_porch_count <= v_back_porch_count + 1;
v_sync <= 0;
end else if (v_display_count < V_DISPLAY) begin
v_display_count <= v_display_count + 1;
v_sync <= 1;
end else if (v_front_porch_count < V_FRONT_PORCH) begin
v_front_porch_count <= v_front_porch_count + 1;
v_sync <= 0;
end else begin
v_sync_count <= 0;
v_back_porch_count <= 0;
v_display_count <= 0;
v_front_porch_count <= 0;
end
end
endmodule
```
在上述代码中,我们将绿色值设置为最大值7,同时将红色和蓝色值设置为零。这将生成一个绿色方块,其大小为640x480像素,位于显示器的左上角。请注意,要将该VGA输出模块连接到显示器的VGA端口,并在VGA显示器上看到绿色方块,还需要根据VGA显示器的分辨率和其他参数调整VGA时序参数。
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