External memory access malfunction when mpc5777c ebi bus clock set

[Woo]

When the ebi bus clock of mpc5777c is set to 50mhz(300hz core clock) or 66mhz(264mhz core clock), an external memory access malfunction occurs.

We have a problem when setting ebi bus clk 50mhz, 66mhz and it works normally when setting to 37.5mhz. Please refer to the picture.

Please check this problem

Thanks.

[Woo · Accepted solution]

The problem has already been identified in the MPC5777C-516DS (EVB), and we received an answer from NXP distributor that we believe it is the problem of the EVB board itself. 

The SRAM used now is CY7C1441KV33-133AXM, and the same issue is confirmed.

[davidtosenovjan]

For your reference or possible other readers of this thread - here there is a solution:

https://community.nxp.com/t5/MPC5xxx/Inquiries-about-MPC5777-EBI-bus-settings/m-p/1593529/highlight/...

[Woo]

I've checked the related content. Thanks for your help.

[davidtosenovjan]

So now you are using your own board?

There are newer revison of MPC5777C-516DS using different memory than before, but also different you have mentioned.

[davidtosenovjan]

I just updated an example:

https://community.nxp.com/t5/MPC5xxx-Knowledge-Base/Example-MPC5777C-External-SRAM-test-GHS714/ta-p/...

[davidtosenovjan]

This is a known issue to me as I have observed the same behavior on my side.

Are you using our MPC5777C-516DS daughter card and the memory used on this board? Could you confirm?