Serial Flash Controller IP Clock Speed

Question

I would like to confirm that the serial flash controller IP is only recommended to run at 25 MHz clock, as per the application note AN-736 on the website updated on 2016.05.20.

My Nios currently runs at 50 MHz, looking at how to handle this.

Thanks.

fawazj_altera · Answer

Hello sir,
The Serial Flash controller speed might be start from 20MHz up to 25MHz max. You can add a PLL IP to your system, the input clock of this PLL will be your clock source on board. Then, you can extract two clocks from PLL, one for the system (Nios II , and other IPs) with a value up to 100MHz (you can achieve higher speed, yet it would be hard to close timing). And the other clock is 25MHz to Serial Flash Controller IP.

Thanks

james_b · Answer

FJumaah, Thanks for the feedback.

james_b · Answer

FJumaah, Thank you for your answer. Yes, it is helpful. I will plan to use 2 clocks, one for Nios and one for the serial flash. I trust that there will be no clock domain crossing issues here.... Thanks, James

fawazj_altera · Answer

You are welcome sir,
Kindly select as best answer if you are satisfied with my reply.
Let me know also if you need further assistance.

Thanks

fawazj_altera · Answer

You are welcome.

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Serial Flash Controller IP Clock Speed

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