题解 | #RAM的简单实现#

使用可综合变量integer和可综合循环for完成深度255ram的初始化；

完整代码

`timescale 1ns/1ns
module ram_mod(
	input clk,
	input rst_n,
	
	input write_en,
	input [7:0]write_addr,
	input [3:0]write_data,
	
	input read_en,
	input [7:0]read_addr,
	output reg [3:0]read_data
);
    reg[3:0] ram[255:0];
    
    integer i;
    always@(posedge clk or negedge rst_n)begin
        if(~rst_n)begin
            for(i=0;i<8;i=i+1)
                ram[i] <= 0;
        end
        else
            ram[write_addr] <= write_en? write_data: ram[write_addr];
    end
    
    
    always@(posedge clk or negedge rst_n)begin
        if(~rst_n)
            read_data <= 0;
        else
            read_data <= read_en? ram[read_addr]: 4'd0;
    end
    
endmodule