AR# 13109

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4.1i Virtex-II MAP - An unused multiplier is not trimmed, and a pack error occurs

Description

Keywords: multiplier, trimmed, trimming, unused

Urgency: Standard

General Description:
My design contains a multiplier whose outputs drive logic that is ultimately unused. In version 3.1i, all of this logic, including the multiplier, was trimmed. In 4.1i, the multiplier is not being trimmed and MAP fails with the following error:

ERROR:Pack - Symbol "mult_shifter/multiplier_block_a1_b1/mult18x18" has no output pin connections.

Solution

To work around this problem, block the trimming of one multiplier output net with a UCF constraint:

NET "mult_shifter/multiplier_block_a1_b1_out<0>" S ;

A CR is being reviewed for this issue.
AR# 13109
Date 08/20/2003
Status Archive
Type General Article
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