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22,570 Views
Registered: ‎07-09-2015

PCI Express WAKE# and PERST#

Hi,

 

I am working on developing an addon card with PCIE Gen3. I dont need the wake functionality in my design. So the wake# pin, can be left open as not connected or any pullup/pulldown required. (i.e) If I dont need the wakeup then how this pin should be connected?

 

Also anyone explain me the PERST# pin. When reading the specifications, i came to know,its like a powergood signal which is high when power is  within specified levels  & clock is stable. What will happen if I pulldown/pullup this pin permanently?

 

 

3 Replies
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Xilinx Employee
Xilinx Employee
22,508 Views
Registered: ‎07-11-2011

Hi,

 

I think WAKE # is open drain, so when you do not want to use it can be left as NC

For PERST please check below link

http://www.xilinx.com/support/answers/59946.html

 

Hope this helps

 

-Vanitha

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Contributor
Contributor
2,231 Views
Registered: ‎02-12-2008

Spoiler
what is the function of the WAKE# pin?
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Explorer
Explorer
720 Views
Registered: ‎10-12-2018

If the add-in card has wakeup capabilities, it must support the WAKE# function.

See http://read.pudn.com/downloads166/ebook/758109/PCI_Express_CEM_1.1.pdf Chapter: 2.3 for more details.

Must be pulled high from the standby power to indicate that the card is wake capable. https://en.wikipedia.org/wiki/PCI_Express