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AR# 12259

5.1i NGDBuild LogiCORE PCI-X - "WARNING:NgdBuild:479 - The input pad net 'RST_N' driving one or more clock loads should only use a dedicated clock buffer..."

Description

Keywords: RST_N, PCI-X, Synplicity, NGDBuild, 479, 4.1i, 5.1i

Urgency: Standard

General Description:
When I implement a PCI-X design (particularly one synthesized using Synplicity), NGDBuild issues the following warning:

"WARNING:NgdBuild:479 - The input pad net 'RST_N' driving one or more clock loads should only use a dedicated clock buffer. This could result in large clock skews on this net."

Solution

This warning is expected and can be safely ignored.

If the net in question is a clock net, then check to make sure the correct type of BUF is being used to drive the clock net.
AR# 12259
Date Created 08/02/2001
Last Updated 03/06/2005
Status Archive
Type General Article