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AR# 25235

9.1i Virtex-5 NGDBuild - "WARNING:NgdBuild:486 - Attribute "IOBDELAY" is not allowed on symbol"


When using ISE 9.1i on a Virtex-5 design, the IOBDELAY attribute, I receive the following warning:

WARNING:NgdBuild:486 - Attribute "IOBDELAY" is not allowed on symbol

"mpu_addr(2)" of type "IPAD". This attribute will be ignored.

Why am I not allowed to add this attribute?


This warning can be safely ignored because the constraint is still being applied. This is a known issue and will be fixed in ISE version 9.2i SP1.

AR# 25235
Date Created 09/04/2007
Last Updated 12/15/2012
Status Active
Type General Article