FPGA Powerdown Cyclone 5 Carrier board design help

[Altera_Forum]

Hi, 

 I am trying to design a carrier board for a Cyclone 5 part, but am a little confused on how to design the power rails. On page 7 and 8 of https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/an/an734.pdf it says to "provide separate power sources for all rails that can be shared between the HPSand FPGA circuitry", but does this mean each HPS/FPGA part on page 8 needs to have its own regulator? Or is it possible that regulators can be shared?  Thank you!

[Altera_Forum]

Hi, 

   --- Quote Start ---  but does this mean each HPS/FPGA part on page 8 needs to have its own regulator? Or is it possible that regulators can be shared?  --- Quote End ---   Meaning, Use separate regulators and its outputs can be shared between FPGA & HPS.   Separate regulator without sharing. 

• The HPS and FPGA portions of the device can have separate external power supplies and independently power on. 
• You can power on the HPS without powering on the FPGA portion of the device. But to power on the FPGA portion, the HPS must already be on or powered on at the same time as the FPGA portion. 

  Let me know if this has helped resolve the issue you are facing or if you need any further assistance.   Best Regards, Anand Raj Shankar (This message was posted on behalf of Intel Corporation)

[Altera_Forum]

Ok, so you mean this is fine then -  

 https://www.alteraforum.com/forum/attachment.php?attachmentid=15757   Basically there will only be one regulator for the 1.1V, but separate lines branching from it to FPGA and HPS. Is this okay? Sorry for the messy diagram