VGA系列文章目录：
（1）VGA成像原理与简单实现
（2）VGA显示板级验证
（3）VGA显示-多分辨率输入
（4）串口发送+RAM+VGA传图

前言

本篇文章是基于上篇《VGA成像原理与简单实现》更改，实现多分辨率输入。

提示：以下是本篇文章正文内容，下面案例可供参考

一、参数化定义

//`define Resolution_480x272 1	//刷新率为60Hz时像素时钟为9MHz
`define Resolution_640x480 1	//刷新率为60Hz时像素时钟为25.175MHz
//`define Resolution_800x480 1	//刷新率为60Hz时像素时钟为33MHz
//`define Resolution_800x600 1	//刷新率为60Hz时像素时钟为40MHz
//`define Resolution_1024x768 1	//刷新率为60Hz时像素时钟为65MHz
//`define Resolution_1280x720 1	//刷新率为60Hz时像素时钟为74.25MHz
//`define Resolution_1920x1080 1	//刷新率为60Hz时像素时钟为148.5MHz

`ifdef Resolution_480x272    
    `define H_Right_Border 0
    `define H_Front_Porch 2
    `define H_Sync_Time 41
    `define H_Back_Porch 2
    `define H_Left_Border 0
    `define H_Data_Time 480
    `define H_Total_Time 525
    `define V_Bottom_Border 0
    `define V_Front_Porch 2
    `define V_Sync_Time 10
    `define V_Back_Porch 2
    `define V_Top_Border 0
    `define V_Data_Time 272
    `define V_Total_Time 286
    
`elsif Resolution_640x480
	`define H_Total_Time  12'd800
	`define H_Right_Border  12'd8
	`define H_Front_Porch  12'd8
	`define H_Sync_Time  12'd96
	`define H_Data_Time 12'd640
	`define H_Back_Porch  12'd40
	`define H_Left_Border  12'd8
	`define V_Total_Time  12'd525
	`define V_Bottom_Border  12'd8
	`define V_Front_Porch  12'd2
	`define V_Sync_Time  12'd2
	`define V_Data_Time 12'd480
	`define V_Back_Porch  12'd25
	`define V_Top_Border  12'd8
	
`elsif Resolution_800x480
	`define H_Total_Time 12'd1056
	`define H_Right_Border 12'd0
	`define H_Front_Porch 12'd40
	`define H_Sync_Time 12'd128
	`define H_Data_Time 12'd800
	`define H_Back_Porch 12'd88
	`define H_Left_Border 12'd0

	`define V_Total_Time 12'd525
	`define V_Bottom_Border 12'd8
	`define V_Front_Porch 12'd2
	`define V_Sync_Time 12'd2
	`define V_Data_Time 12'd480
	`define V_Back_Porch 12'd25
	`define V_Top_Border 12'd8

`elsif Resolution_800x600
	`define H_Total_Time 12'd1056
	`define H_Right_Border 12'd0
	`define H_Front_Porch 12'd40
	`define H_Sync_Time 12'd128
	`define H_Data_Time 12'd800
	`define H_Back_Porch 12'd88
	`define H_Left_Border 12'd0

	`define V_Total_Time 12'd628
	`define V_Bottom_Border 12'd0
	`define V_Front_Porch 12'd1
	`define V_Sync_Time 12'd4
	`define V_Data_Time 12'd600
	`define V_Back_Porch 12'd23
	`define V_Top_Border 12'd0

`elsif Resolution_1024x768
	`define H_Total_Time 12'd1344
	`define H_Right_Border 12'd0
	`define H_Front_Porch 12'd24
	`define H_Sync_Time 12'd136
	`define H_Data_Time 12'd1024
	`define H_Back_Porch 12'd160
	`define H_Left_Border 12'd0

	`define V_Total_Time 12'd806
	`define V_Bottom_Border 12'd0
	`define V_Front_Porch 12'd3
	`define V_Sync_Time 12'd6
	`define V_Data_Time 12'd768
	`define V_Back_Porch 12'd29
	`define V_Top_Border 12'd0

`elsif Resolution_1280x720
	`define H_Total_Time 12'd1650
	`define H_Right_Border 12'd0
	`define H_Front_Porch 12'd110
	`define H_Sync_Time 12'd40
	`define H_Data_Time 12'd1280
	`define H_Back_Porch 12'd220
	`define H_Left_Border 12'd0

	`define V_Total_Time 12'd750
	`define V_Bottom_Border 12'd0
	`define V_Front_Porch 12'd5
	`define V_Sync_Time 12'd5
	`define V_Data_Time 12'd720
	`define V_Back_Porch 12'd20
	`define V_Top_Border 12'd0
		
`elsif Resolution_1920x1080
	`define H_Total_Time 12'd2200
	`define H_Right_Border 12'd0
	`define H_Front_Porch 12'd88
	`define H_Sync_Time 12'd44
	`define H_Data_Time 12'd1920
	`define H_Back_Porch 12'd148
	`define H_Left_Border 12'd0

	`define V_Total_Time 12'd1125
	`define V_Bottom_Border 12'd0
	`define V_Front_Porch 12'd4
	`define V_Sync_Time 12'd5
	`define V_Data_Time 12'd1080
	`define V_Back_Porch 12'd36
	`define V_Top_Border 12'd0	
	
`endif

二、引用参数

 
    `include "vga_parameter.v" 
      
    parameter [11:0]Hsync_end = `H_Total_Time; 
    parameter [11:0]HS_END =  `H_Sync_Time;
    parameter [11:0]Vsync_end = `V_Total_Time;
    parameter [11:0]VS_END = `V_Sync_Time;
    parameter [11:0]Hdata_begin =  `H_Sync_Time + `H_Back_Porch + `H_Left_Border;
    parameter [11:0]Hdata_end = `H_Sync_Time + `H_Left_Border + `H_Back_Porch + `H_Data_Time;
    parameter [11:0]Vdata_begin = `V_Sync_Time + `V_Back_Porch + `V_Top_Border;
    parameter [11:0]Vdata_end = `V_Sync_Time + `V_Back_Porch + `V_Top_Border + `V_Data_Time; 

三、完整代码展示

VGA_CTRL_640x480.v

`timescale 1ns / 1ps
//

// Create Date: 2022/11/30 15:18:34
// Module Name: VGA_CTRL_640x480
// Project Name: 640x480图像输出
// Revision: VIVADO 2018.3
// Name:小王在努力...
//


module VGA_CTRL_640x480(
    clk,
    reset,
    Data,
    Data_request,
    HS_YS,
    VS_YS,
    VGA_BLK,
    RGB_output
    );
    input clk;
    input reset;
    input [23:0]Data;             //输入数据
    output  reg Data_request;     //数据请求脉冲信号
    output reg HS_YS;           //行同步脉冲信号
    output reg VS_YS;           //场同步脉冲信号
    output reg VGA_BLK;         //VGA有效数据显示脉冲信号
    output reg [23:0]RGB_output;      //RGB输出值 
     
    `include "vga_parameter.v" 
      
    parameter [9:0]Hsync_end = `H_Total_Time; 
    parameter [6:0]HS_END =  `H_Sync_Time;
    parameter [9:0]Vsync_end = `V_Total_Time;
    parameter [1:0]VS_END = `V_Sync_Time;
    parameter [7:0]Hdata_begin =  `H_Sync_Time + `H_Back_Porch + `H_Left_Border;
    parameter [9:0]Hdata_end = `H_Sync_Time + `H_Left_Border + `H_Back_Porch + `H_Data_Time;
    parameter [5:0]Vdata_begin = `V_Sync_Time + `V_Back_Porch + `V_Top_Border;
    parameter [9:0]Vdata_end = `V_Sync_Time + `V_Back_Porch + `V_Top_Border + `V_Data_Time; 
    reg [11:0]H_cnt;
    always @ (posedge clk or negedge reset)
        if(!reset)
            H_cnt <= 0;
        else if(H_cnt >= Hsync_end -1 )
            H_cnt <= 0;
        else 
            H_cnt <= H_cnt + 1'b1;
    //  行同步脉冲信号      
    always @ (posedge clk)
        HS_YS <= (H_cnt <= HS_END-1 )?0:1;
        
        
     reg [11:0]V_cnt;
    always @ (posedge clk or negedge reset)
        if(!reset)
            V_cnt <= 0;
        else if( H_cnt == Hsync_end -1)begin
            if(V_cnt >= Vsync_end-1)
                V_cnt <= 0;
            else 
                V_cnt <= V_cnt + 1;
            end
        else 
             V_cnt <= V_cnt ;
    //场同步脉冲信号         
    always @ (posedge clk)
        VS_YS <= (V_cnt <= VS_END-1 )?0:1; 
        
    always @ (posedge clk) 
        Data_request <= (H_cnt >= Hdata_begin - 1 )&&(H_cnt <= Hdata_end - 2)&&(V_cnt >= Vdata_begin)&&(V_cnt <= Vdata_end -1);
     
    always @ (posedge clk) 
        VGA_BLK <= Data_request;
        
    always @ (posedge clk)
        RGB_output <= (Data_request) ?Data:0;
     
endmodule

vga_parameter.v

//`define Resolution_480x272 1	//刷新率为60Hz时像素时钟为9MHz
`define Resolution_640x480 1	//刷新率为60Hz时像素时钟为25.175MHz
//`define Resolution_800x480 1	//刷新率为60Hz时像素时钟为33MHz
//`define Resolution_800x600 1	//刷新率为60Hz时像素时钟为40MHz
//`define Resolution_1024x768 1	//刷新率为60Hz时像素时钟为65MHz
//`define Resolution_1280x720 1	//刷新率为60Hz时像素时钟为74.25MHz
//`define Resolution_1920x1080 1	//刷新率为60Hz时像素时钟为148.5MHz

`ifdef Resolution_480x272    
    `define H_Right_Border 0
    `define H_Front_Porch 2
    `define H_Sync_Time 41
    `define H_Back_Porch 2
    `define H_Left_Border 0
    `define H_Data_Time 480
    `define H_Total_Time 525
    `define V_Bottom_Border 0
    `define V_Front_Porch 2
    `define V_Sync_Time 10
    `define V_Back_Porch 2
    `define V_Top_Border 0
    `define V_Data_Time 272
    `define V_Total_Time 286
    
`elsif Resolution_640x480
	`define H_Total_Time  12'd800
	`define H_Right_Border  12'd8
	`define H_Front_Porch  12'd8
	`define H_Sync_Time  12'd96
	`define H_Data_Time 12'd640
	`define H_Back_Porch  12'd40
	`define H_Left_Border  12'd8
	`define V_Total_Time  12'd525
	`define V_Bottom_Border  12'd8
	`define V_Front_Porch  12'd2
	`define V_Sync_Time  12'd2
	`define V_Data_Time 12'd480
	`define V_Back_Porch  12'd25
	`define V_Top_Border  12'd8
	
`elsif Resolution_800x480
	`define H_Total_Time 12'd1056
	`define H_Right_Border 12'd0
	`define H_Front_Porch 12'd40
	`define H_Sync_Time 12'd128
	`define H_Data_Time 12'd800
	`define H_Back_Porch 12'd88
	`define H_Left_Border 12'd0

	`define V_Total_Time 12'd525
	`define V_Bottom_Border 12'd8
	`define V_Front_Porch 12'd2
	`define V_Sync_Time 12'd2
	`define V_Data_Time 12'd480
	`define V_Back_Porch 12'd25
	`define V_Top_Border 12'd8

`elsif Resolution_800x600
	`define H_Total_Time 12'd1056
	`define H_Right_Border 12'd0
	`define H_Front_Porch 12'd40
	`define H_Sync_Time 12'd128
	`define H_Data_Time 12'd800
	`define H_Back_Porch 12'd88
	`define H_Left_Border 12'd0

	`define V_Total_Time 12'd628
	`define V_Bottom_Border 12'd0
	`define V_Front_Porch 12'd1
	`define V_Sync_Time 12'd4
	`define V_Data_Time 12'd600
	`define V_Back_Porch 12'd23
	`define V_Top_Border 12'd0

`elsif Resolution_1024x768
	`define H_Total_Time 12'd1344
	`define H_Right_Border 12'd0
	`define H_Front_Porch 12'd24
	`define H_Sync_Time 12'd136
	`define H_Data_Time 12'd1024
	`define H_Back_Porch 12'd160
	`define H_Left_Border 12'd0

	`define V_Total_Time 12'd806
	`define V_Bottom_Border 12'd0
	`define V_Front_Porch 12'd3
	`define V_Sync_Time 12'd6
	`define V_Data_Time 12'd768
	`define V_Back_Porch 12'd29
	`define V_Top_Border 12'd0

`elsif Resolution_1280x720
	`define H_Total_Time 12'd1650
	`define H_Right_Border 12'd0
	`define H_Front_Porch 12'd110
	`define H_Sync_Time 12'd40
	`define H_Data_Time 12'd1280
	`define H_Back_Porch 12'd220
	`define H_Left_Border 12'd0

	`define V_Total_Time 12'd750
	`define V_Bottom_Border 12'd0
	`define V_Front_Porch 12'd5
	`define V_Sync_Time 12'd5
	`define V_Data_Time 12'd720
	`define V_Back_Porch 12'd20
	`define V_Top_Border 12'd0
		
`elsif Resolution_1920x1080
	`define H_Total_Time 12'd2200
	`define H_Right_Border 12'd0
	`define H_Front_Porch 12'd88
	`define H_Sync_Time 12'd44
	`define H_Data_Time 12'd1920
	`define H_Back_Porch 12'd148
	`define H_Left_Border 12'd0

	`define V_Total_Time 12'd1125
	`define V_Bottom_Border 12'd0
	`define V_Front_Porch 12'd4
	`define V_Sync_Time 12'd5
	`define V_Data_Time 12'd1080
	`define V_Back_Porch 12'd36
	`define V_Top_Border 12'd0	
	
`endif

四、仿真结果展示

以640X480为例展示仿真波形数据：

根据640x480数据发送要求，每次应该有480行数据如上图时间间隔为(两个蓝线之间)15.36ms，经计算为480Line。而RGB_output接收也为480Line个数据，没有丢失，至此场数据节点验证完成。

【附件：】链接：https://pan.baidu.com/s/1QAj2uy31XYPyE80VdfKa_Q?pwd=k9vd
提取码：k9vd