【IC设计】Vivado单口RAM的使用和时序分析

文章目录

• [创建单口RAM IP](#创建单口RAM IP)
• • [IP Catalog中选择单口RAM IP](#IP Catalog中选择单口RAM IP)
  • Basic
  • [Port A Options](#Port A Options)
  • [Other Options](#Other Options)
• 仿真
• • 找到IP例化原语
  • 编写Testbench
• 波形分析

创建单口RAM IP

IP Catalog中选择单口RAM IP

Basic

Port A Options

Other Options

仿真

找到IP例化原语

IP Sources-Instantiation Template-veo文件中找到IP例化原语

编写Testbench

创建single_port_ram_test.v，代码如下：

`timescale 1ns / 1ps

//功能：测试单口ram
//ena means port a clock enable:
//enables read,write and reset operations through port A.Optional in all configurations.
//wea means port a write enbale:
//enables write operations through port a available in all ram configurations.
module single_port_ram_test();
    reg clk;

    //ena使能
    reg ena;
    
    //write enable a port
    //wea为0时处于读取状态，读取有1个周期的时延，wea为1时处于写入状态
    reg wea;
    
    //地址宽度为10，ram中最多存1024个数据
    reg [9:0] addra;

    //输入数据宽度为32，即4个16进制数据
    reg [31:0] dina;

    //输出数据douta
    wire [31:0] douta;

    reg [3:0] count;
    
    reg rst ;
    
    initial begin
        clk=1;
        rst = 0 ;
        count=4'b0;
        wea=0;
        ena=0;
        @ (negedge clk) ena = 1 ;
        #90;
        dina=32'habcd;
        #20;
        dina=32'h000a;
        #20;
        dina=32'h00ba;
        #20;
        dina=32'h0bcd;
        #20;
        dina=32'hxxxx;
        #120;
        $finish;
    end
    always begin
        #10;
        clk=~clk;
    end

    always @ ( posedge clk , posedge rst ) begin
        if (rst)
            count  <= 'b0 ;
        else if ( count < 'd3  && ena )
            count <= count + 'b1 ;
        else
            count <= 0 ;
    end
    
    //初始状态rst=0,所以将addra置为0
    always @ ( posedge clk , posedge rst ) begin
        if ( rst )
            addra <= 'b0 ;
        //每个上升沿addra+1
        else if ( addra < 3  && ena)
            addra <= addra + 1 ;
        else
            addra <= 'b0 ;
    end
    
    always @ ( posedge clk , posedge rst ) begin
        if (rst)
            wea <= 'b0 ; 
        else if (count == 'd3) 
            wea <= ~ wea ; 
        else
            wea <= wea ;
    end
    
    

    //单口ram实例
    blk_mem_gen_1 single_port_ram_inst (
        .clka(clk),    // input wire clka
        .ena(ena),      // input wire ena
        .wea(wea),      // input wire [0 : 0] wea
        .addra(addra),  // input wire [9 : 0] addra
        .dina(dina),    // input wire [31 : 0] dina
        .douta(douta)  // output wire [31 : 0] douta
    );
endmodule

波形分析