支持8253控制字32位可编程计数器软核的设计与实现

Implementation and Design of 32 b PIT Soft Core Based on 8253

8253作为Intel公司推出的可编程定时计数器,用来产生定时信号。分析传统8253功能以及缺陷,结合FPGA的特点,设计支持8253控制字格式具有自主知识产权的32位可编程定时计数器软核P32IT8253。详细分析对设计中关键路径的产生原因,给出一种便于在不同器件公司产品间移植的优化设计方法。软核通过仿真,下载到Xilinx的FPGA中。整个设计针对提升传统8253/8254配合单片机或者接口板中控制电路的性能,提供了一种解决方案。

As a product launched by Intel,8253 is applied to generate time - lapse signal. 8253 functional and its shortage are analysed,based on the character of FPGA, 32 b Programmable Interval Timer（PIT） IP core supported by 8253 control words is designed. While analyzing the cause to critical path, to introduce a kind of optimized solution can be easy to transplant in any products from different companies. The IP has been passed simulation and downloaded in FPGA. The entire design provids a solution scheme,aiming at improving the performance of the traditional 8253/8254 controlled by single chip computer or PC interface board.