Hi, I need to perform configuration-memory readback on an active (not shutdown) virtex 4 device.

Does anyone know if on Virtex 4 is it still the case that readback should not be performed on active devices, for frames that are prior to memory element frames? For Virtex 2 and Spartan 3 this can lead to configuration memory corruption. The Virtex 4 documentation is unclear on this point.

Thanks, Vivian