基于CPLD的VHDL语言数字钟（含秒表）设计



利用一块芯片完成除时钟源、按键、扬声器和显示器（数码管）之外的所有数字电路功能。所有数字逻辑功能都在CPLD器件上用VHDL语言实现。这样设计具有体积小、设计周期短（设计过程中即可实现时序仿真）、调试方便、故障率低、修改升级容易等特点。

本设计采用自顶向下、混合输入方式（原理图输入—顶层文件连接和VHDL语言输入—各模块程序设计）实现数字钟的设计、下载和调试。

-CPLD based on the VHDL language digital clock (with stopwatch) design using a chip can be completed in addition to the clock source, buttons, speakers and display (LED) in addition to all functions of digital circuits. All digital logic functions are used in the CPLD device VHDL language. This design has a small and short design cycle (design process to achieve timing simulation), to facilitate debugging, fault rate is low and easy to modify the characteristics of the upgrade. The design uses a top-down, mixed input (input schematic- top-level file access and VHDL language input- the module program design) Design of digital clock, download and debug.