AR# 51337


7 Series - How can I work around the fallback limitation for 32-bit addressing in SPI mode?


In the 7 Series FPGAs Configuration User Guide v1.4 (UG470), there is a note indicating that fallback will not work with the 32-bit addressing mode:

"The MultiBoot and fallback feature can be used with all master configuration modes, except when the 32-bit addressing option is used with the master SPI configuration mode."

How can I work around this issue to use MultiBoot and Fallback on a SPI flash of 256 Mb or larger?


A fix has been implemented in ISE Design Suite BitGen 14.4 and Vivado write_bistream 2012.4. This enables fallback to work correctly with a 256 Mb or larger flash and 32-bit addressing mode.

The 7 Series FPGAs Configuration User Guide (UG470) has been updated.

AR# 51337
Date 02/18/2014
Status Active
Type General Article
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