From 20395b7d4e417c9551afe7967ec02ef6e07ddbc5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=98=B3=E5=85=89=E5=B0=91=E5=B9=B4?= <849317537@qq.com>
Date: Mon, 13 May 2024 18:40:18 +0800
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---
 digital_tube/tb_dt.v | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/digital_tube/tb_dt.v b/digital_tube/tb_dt.v
index b3ab60b..0e0ca20 100644
--- a/digital_tube/tb_dt.v
+++ b/digital_tube/tb_dt.v
@@ -1,6 +1,10 @@
 `timescale 1ns/1ns
 module tb_dt();
 
+// 我们如果上板验证, 需要再 .xdc文件中, 添加时钟约束
+// create_clock -period 20.000 -name sys_clk [get_posts sys_clk]  
+// 创建一个时钟, 周期是20纳秒, 对应的端口是系统时钟
+
 reg sys_clk;
 reg sys_rst;