只模拟的话直接终端运行会快很多
计数器举例

mkdir src

counter.v

module counter(input wire clk,input wire rst_n,output reg[31:0] cnt 
);
always @(posedge clk or negedge rst_n)if(!rst_n)cnt <= 31'h0;elsecnt <= cnt+1;endmodule  

tb.v

module tb;
wire[31:0] out;
reg clk;
reg rst_n;initial begin#10 clk <= 1'b0;#10 rst_n = 1'b0;#10 rst_n = 1'b1;#5000 $finish;
endalways #1 clk = ~clk;counter c1(clk,rst_n,out);endmodule  

编译 创建模拟snapshot

mkdir sim
cd sim
xvlog ../src/counter.v ../src/tb.v
xelab -debug typical -top tb -snapshot tb

创建脚本
xsim_cfg.tcl

 log_wave -recursive *run allexit  

xsim tb --tclbatch xsim_cfg.tcl

打开gui

xsim --gui tb.wdb