arria 10 transciever calibration clock don't use clkusr

[smile123]

hello everyone:

    now,i have some issues with arria 10 transceiver calibration clock, on my test board, the clkusr is connected to gnd,but the transceiver calibration clock need 100mhz of clkusr pin,so how should i do to solve the question...,can i use other clk input pin on the fpga or use a pll output clk,if can, what should i do?

     thanks everyone in advance.

[Kshitij_Intel]

Hi,

As per user guide 7.3.2. CLKUSR (intel.com) it seems you cannot use it. Because For transceiver calibration, CLKUSR must be a free-running clock running between 100 MHz to 125 MHz at power-up depending on the device’s configuration scheme as shown in the following table. Transceiver calibration starts utilizing the CLKUSR during device configuration and may continue to use it even when the device enters user mode.

Note: CLKUSR cannot be used as the reference clock for PLL.

Thank you

Kshitij Goel

[smile123]

thanks for your reply，if so,for transceiver calibration, it seems that must be provided a 100mhz clk on the clkusr pin？there are no other methods to solve this question,is this?

Can I use a clock not from clkusr pin for calibration while in user mode that program is running?（use other pin input clock）

[Kshitij_Intel]

Hi,

As per user guide it seems there is no other methods.

Can I use a clock not from CLKUSR pin for calibration while in user mode that program is running?

--> Can you please elaborate this. Earlier you said your CLKUSR is GND. Now, you want to take clock not from CLKUSR pin. Please help to explain this.

Thank you

Kshitij Goel

[smile123 · Accepted solution]

ok,thanks for your answer，now,i have Redesigned circuit。

[Kshitij_Intel]

Hi,

I’m glad that your question has been addressed, I now transition this thread to community support. If you have a new question, please login to ‘https://supporttickets.intel.com’, view details of the desire request, and post a response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions.

Thank you

Kshitij Goel