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AR# 14320

4.2i CORE Generator - "ERROR: Port B Width cannot be 1 when Port B Signed for a Parallel Multiplier"

Description

Keywords: COREGen, multiply, parallel

Urgency: Standard

General Description:
When I use CORE Generator with IP Update #1 (4.1i series), I cannot generate a constant coefficient multiplier with a coefficient of -1 using the Multiplier 4.0 core. When I attempt to do so, the following error is reported:

"ERROR: Port B Width cannot be 1 when Port B Signed for a Parallel Multiplier."

Solution

To avoid this problem, create a 2-port multiplier (deselect the constant), and connect Port B to a signed value of -1.

This issue has been fixed in the Multiplier v5.0 core, which is available in 4.2i IP Update #2:
http://support.xilinx.com/ipcenter/coregen/updates.htm
AR# 14320
Date Created 03/26/2002
Last Updated 10/08/2003
Status Archive
Type General Article