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AR# 15477

5.1i XST - "WARNING:Xst:1294 - Latch <latch_name> is equivalent to a wire in block <block_name>"


Keywords: latch, flip-flop, flip, flop, FF, register, constant, gate, enable

Urgency: Standard

General Description:
When a latch has a Constant Gate Enable signal, XST does not take the reset signal into consideration; subsequently, it reduces the latch to a constant value.

The following warning is issued:

"WARNING:Xst:1294 - Latch <latch_name> is equivalent to a wire in block <block_name>."


This problem is fixed in the latest 5.1i Service Pack, available at:
The first service pack containing the fix is 5.1i Service Pack 1.
AR# 15477
Date Created 08/26/2002
Last Updated 07/18/2007
Status Archive
Type General Article