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AR# 17490

6.1i ISE - In Project Navigator, Readback options are not available for Spartan-3 projects


Keywords: Readback, Spartan-3, ISE, option, Generate Programming File

Urgency: Standard

General Description:
In ISE, I cannot select the "Create Mask File" option in the Readback tab of the Generate Programming File properties for Spartan-3 devices.


This is a Project Navigator property dependency issue. For all Virtex-II derivative families, the ability to create a Readback data file (and consequently, an MSK file) is enabled only if the "Encrypt Bitstream" property on the Encryption tab is NOT set. However, since Spartan-3 does not have an encryption property or tab, the dependency is broken and the property is disabled.

To work around this, follow these steps:
1. Change your project device property to a Virtex-II or Virtex-II Pro part.
2. Disable Encryption.
3. Change back to a Spartan-3 device. The Readback bitstream is available, and after you check it, the generate mask file is enabled.

Alternatively, you can use the BitGen command line to access the desired options.

This problem has been fixed in the latest 6.1i Service Pack, available at:
The first service pack containing the fix is 6.1i Service Pack 1.
AR# 17490
Date 02/07/2006
Status Archive
Type General Article