Author Topic: Conecting external clock signal to the cyc1000  (Read 605 times)

sjoshi

  • Active Member
  • *
  • Posts: 23
Conecting external clock signal to the cyc1000
« on: September 19, 2021, 11:58:32 AM »
I am trying to connect an external board with a ULPI PHY to the CYC1000. I have to use the 60 MHz clock generated by this extrenal board to drive the logic within my CYC1000. I understand that if I use the rising_edge function on this signal then it has to be connected to a clock enabled input. From the schematics, I see that all such pins are grounded except two. One of those is the 12M onboard clock. The other is marked clk_x and is reserved for a crystal that is not connected.

Can I simply solder my clock signal to the free pad on the pcb? If yes,can someone point out which of the 4 pads is the output pad? I cannot figure it out somehow.

Thomas D

  • Active Member
  • *
  • Posts: 26
Re: Conecting external clock signal to the cyc1000
« Reply #1 on: September 24, 2021, 09:28:18 AM »
Hi,
I have marked the clk_x pad on the attached screenshot.

br
Thomas

sjoshi

  • Active Member
  • *
  • Posts: 23
Re: Conecting external clock signal to the cyc1000
« Reply #2 on: September 24, 2021, 10:06:51 AM »
Thanks!