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AR# 2307

M1.3/M1.4 CPLD Hitop - Fitter issues spurious nd14 warnings

Description

Keywords: hitop, fitter, cpld, nd14, warnings, pre, clr, dff

Urgency: standard

General Description:

Fitter issues spurious nd14 warnings about undriven nets
connected to the PRE/CLR pins of DFF symbols when reading XNF
input designs.

Solution

The underlying logic implementation is correct.

There is no way to get rid of the warnings as these
warnings are desired to indicate when actual logic
is unconnected. The software is unable to determine
what logic is important, and what is not.
AR# 2307
Date Created 06/07/1997
Last Updated 03/29/2000
Status Archive
Type General Article