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AR# 14700

5.1i Constraints Editor - Constraints Editor does not properly initialize RAMs

Description

General Description:

When I use a dual-port RAM or multi-bit ROM in my design, it appears as multiple instances in Constraints Editor. I assign INIT values to these instances, but they are ignored by the tools.

Solution

Do not use Constraints Editor to initialize values for these RAM/ROMs.

To work around, this situation, specify the INITs by hand in the UCF, NCF, or source file on the top-level instance.

AR# 14700
Date Created 08/29/2007
Last Updated 01/18/2010
Status Archive
Type General Article