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AR# 21630

7.1i XST - A design that fits in 6.3i does not fit in 7.1i when using finite state machines with CPLD devices

描述

Keywords: Fit, Design, state, machine, does, not, CPLD, xst

Urgency: Standard

General Description:
A design that fits in 6.3i does not fit in 7.1i when using finite state machines with CPLD devices.

解决方案

In XST 7.1i, the synthesis algorithm has changed.

In XST 7.1i two Finite State Machines are inferred instead of one by default for better timing. To get the same behavior as with the prevision version, you can set the following switches:

-fsm_extract NO
-fsm_encoding compact

To see how to set these switches, please refer to the Project Navigator help if in GUI mode or the XST User Guide if in command line mode.
AR# 21630
日期 01/08/2009
状态 Archive
Type 综合文章
的页面