05-17-2017 03:37 PM
Hi ,
i'd like to change voltage reference on bank 3 from 3.3volt to 1.8 volt.
i'm using the carrier board and so i have a switch to select power supply to the bank.
Is there a procedure in order to change voltage bank supply,without damaging io's, before or after fpga bitdown stream ?
05-22-2017 10:19 PM - edited 05-30-2017 08:27 PM
Hi lucamonopoli,
The guidance is not to drive the I/O bank voltage with a higher voltage than what is configured in the bitfile (set in the sbRIO CLIP Generator). There are two scenarios to consider:
The above scenarios ensure that the bank voltage isn't higher than the I/O standard that was previously selected. Xilinx states in the Series 7 Select I/O Resource document the banks enter an over-voltage protection mode if Vcco (bank voltage) exceeds the I/O standard in the pin constraint; however, the above guidance still applies to prevent encountering this scenario. Please let me know if you have any additional questions around this topic.
EDIT: The above can likely be explained more concisely as follows: Vcco bank voltage should be less than or equal to the pin constraints (defined in the sbRIO CLIP Generator) at any given time.
-Tanner
05-30-2017 10:42 AM
thanks a lot
LM