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  3. AR# 12921: 4.1i MAP - An XST design fails with "ERROR:Pack:270 - Invalid "IOB" property value of 'auto' found on register symbol. The only accepted values for IOB are TRUE or FALSE."

AR# 12921

4.1i MAP - An XST design fails with "ERROR:Pack:270 - Invalid "IOB" property value of 'auto' found on register symbol. The only accepted values for IOB are TRUE or FALSE."

Description

Keywords: 4.1, WebPACK, MAP, IOB, auto, TRUE, FALSE, XST

Urgency: Standard

General Description:
A design synthesized using XST fails in MAP with the following error:

ERROR:Pack:270 - Invalid "IOB" property value of 'auto' found on register symbol '<Symbol_Name>'. The only accepted values for "IOB" are "TRUE" or "FALSE".

Solution

It was found that XST was incorrectly applying the attribute "IOB=auto" to registers and that the MAP error is valid.

This problem is being investigated as an XST issue. Meanwhile, to prevent the failure, set the XST option "Pack registers into IOs" to either TRUE or FALSE.
AR# 12921
Date 08/20/2003
Status Archive
Type General Article