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AR# 63151

Virtex 5 - GLUTMASK_b mask setting when not using Frame_ECC or POST_CRC in the design


When reading back Configuration memory it is recommended to shut down the device.  

If you must read back the Configuration memory while the device is operational, LUTRAM and SRL16's must be masked out.


The BitGen option below can be used to set the GLUTMASK_b mask bit correctly

However it should only be used in the following conditions:

1) The design does NOT contain the typical readback mechanisms such as the Frame _ECC primitive or enabling of the POST_CRC feature.


2) The device is being read back while operational.

BitGen option:

-g write_glutmask_b:yes

Note: This must be manually entered into the Other BitGen Command Line Options field as shown below:


This is applicable to ISE tool versions 12.1 through 14.7.


AR# 63151
Date 12/19/2014
Status Active
Type General Article
  • Virtex-5
  • Virtex-5Q
  • Virtex-5QV
  • ISE Design Suite - 12
  • ISE Design Suite - 13
  • ISE Design Suite - 14
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