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AR# 1256

Foundation HDL Editor: "Unhandled Exception" during VHDL synthesis

Description

While trying to synthesize VHDL code, a Windows error similar
to the following is issued during the "flatten" phase:

Unhandled Exception Detected
C000 0005 XVHDL:DDE

Solution

This error is issued when a combinational feedback loop
(latch) has been inferred in a lower level entity.

If the feedback loop is not desired, edit the VHDL code
to remove the loop.

If the feedback loop is intentionally being inferred, there
is an update to the XVHDL compiler that will not issue the
Windows error:

http://www.xilinx.com/txpatches/pub/swhelp/foundation/spxv.exe
AR# 1256
Date Created 09/17/1996
Last Updated 04/28/1999
Status Archive
Type General Article