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AR# 14874

7.1i XST - Known Issues for designing counters

描述

General Description: 

The following known limitations can prevent XST from inferring counters: 

 

- The counter load signal is connected to a comparator. 

- The counter count statement comes before the load control signal. 

- The counter counts by a power of 2. 

- Not all count bits are connected. 

- The count statement consists of the concatenation operator and the count value.

解决方案

In each situation listed above, XST produces sub-optimal timing results. The only way to work around this issue is to avoid the above conditions when inferring counters.

AR# 14874
日期 05/14/2014
状态 Archive
Type 综合文章
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