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AR# 20829

7.1i XST - Inferring block RAM in XST utilizes additional block RAM resources (does not use the parity)

Description

When inferring block RAM, XST utilizes additional block RAM components. Why?

Solution

Additional block RAM is utilized because XST is not using the parity of the block RAM component.

In ISE 7.1i, XST uses the parity bits in Virtex-4.

For all other devices, the support for inferring with parity is offered in ISE 8.1i.

The only method by which to work around this issue within XST for older versions is to instantiate the primitive instead of inferring it.

AR# 20829
Date Created 09/03/2007
Last Updated 04/09/2010
Status Archive
Type General Article