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AR# 34765

Spartan-6 Block RAM - Uninitialized Block RAM Sites do not Readback as Expected

Description

Block RAM which were uninitialized in a design will not be read back correctly in ISE Design Suite 11.4 and earlier software.

Solution

Prior to ISE design tools 11.5, if a design contained unused Block RAM sites and an attempt was made to readback the state of the Block RAM contents, a failure would occur. Failures will not occur on BRAM sites that are used in the design--they will readback correctly.

There is no workaround to this issue in the ISE design tools 11.4 and earlier. ISE design tools 11.5 and later software handle this correctly. ISE design tools 11.5 is currently available.

AR# 34765
Date Created 03/25/2010
Last Updated 05/26/2010
Status Active
Type General Article
Devices
  • Spartan-6 LX
  • Spartan-6 LXT
Tools
  • ISE Design Suite - 11.1
  • ISE Design Suite - 11.2
  • ISE Design Suite - 11.3
  • ISE Design Suite - 11.4