示例
被仿真的文件名为：cmd_handle.v，其中有r_st_current和r_st_next两个状态机变量。
该模块在tb文件中，被例化的名称为cmd_handle_u0
按照如下格式写：cmd_handle_u0.r_st_current
示例tb文件：
c
`timescale 1ns / 1ps
//
// Company:
// Engineer:
//
// Create Date: 2025/04/10 21:54:40
// Design Name:
// Module Name: tb_cmd_handle
// Project Name:
// Target Devices:
// Tool Versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//
module tb_cmd_handle();
cmd_handle #(
.P_SYSTEM_CLK (50_000_000 ), //输入时钟频率
.P_BAUD_RATA (115200 ), //波特率
.P_DATA_WIDTH (8 ), //Uart数据位宽
.P_STOP_WIDTH (1 ), //停止位位宽 1 or 2
.P_CHECK (2 ) //0为奇校验，1为偶校验
)cmd_handle_u0
(
.i_clk (clk ),
.i_rst (rst ),
.i_uart_rx (w_uart_tx),
.o_uart_tx (w_uart_rx),
.o_start_gain (),
.o_gain_speed ()
);
//--------------------------------------------------------------------------
//-- 状态机名称查看器
//--------------------------------------------------------------------------
//1个ASSIC码字符宽度是8位，例如"IDLE"有4个字符则需要32位宽
//80宽度可以容纳10个字符
reg [79:0] r_st_next ;
reg [79:0] r_st_current ;
//这段参数声明是一定要有的，否则在仿真时会报未声明变量的错误，如下图
localparam P_ST_IDLE = 0 ,
P_ST_READ = 1 ,
P_ST_HEAD = 2 ,
P_ST_READ2 = 3 ,
P_ST_A = 4 ,
P_ST_DATA = 5 ,
P_ST_ANYS = 6 ;
always @(*) begin
case(cmd_handle_u0.r_st_current)
P_ST_IDLE : r_st_current = "P_ST_IDLE " ;
P_ST_READ : r_st_current = "P_ST_READ ";
P_ST_HEAD : r_st_current = "P_ST_HEAD ";
P_ST_READ2: r_st_current = "P_ST_READ2";
P_ST_A : r_st_current = "P_ST_A ";
P_ST_DATA : r_st_current = "P_ST_DATA ";
P_ST_ANYS : r_st_current = "P_ST_ANYS ";
default:r_st_current = "P_ST_IDLE ";
endcase
end
always @(*) begin
case(cmd_handle_u0.r_st_next)
P_ST_IDLE : r_st_next = "P_ST_IDLE " ;
P_ST_READ : r_st_next = "P_ST_READ ";
P_ST_HEAD : r_st_next = "P_ST_HEAD ";
P_ST_READ2: r_st_next = "P_ST_READ2";
P_ST_A : r_st_next = "P_ST_A ";
P_ST_DATA : r_st_next = "P_ST_DATA ";
P_ST_ANYS : r_st_next = "P_ST_ANYS ";
default: r_st_next = "P_ST_IDLE ";
endcase
end
endmodule直接运行仿真，就可以：
