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AR# 11878

4.1i CPLDFit - During multi-level logic optimization, the fitter hangs without reporting warnings or errors

Description

Keywords: 3.1i, 4.1i, CPLD, XC9500, 9500, crash, hang, Hitop

Urgency: Standard

General Description:
On certain designs, the fitter hangs after writing out the following statement:

"Mapping a total of XX equations into YY functional blocks."

Solution

In some cases, disabling the use of local feedback allows the fitter to function normally. This will not change the logic used to implement the design, but may have an effect on the resulting timing.

This problem is fixed in the latest 4.1i Service Pack, available at:
http://support.xilinx.com/support/techsup/sw_updates.
The first service pack containing the fix is 4.1i Service Pack 1.
AR# 11878
Date Created 06/29/2001
Last Updated 08/06/2003
Status Archive
Type General Article