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problem using altmemphy to read ddr2

XQSHEN
Novice
151 Views

Device: EP4CE22F17C8

Memeory: Micron MT47H64M8CB-3

IP: altmemphy DDR2

Burst count = 16

I met a problem to read out data using altmemphy.

1) if I start with write operation ddr2 at first,  after finished; then try to read data out of memory, then I can never get the data, the local_rdata_valid is always low.

2) if I don't do any write operation,  try to read the data out of memory, I can get it successfully.

I don't see any problem with my write process.

What's wrong?

 

 

Picture : write + read

XQSHEN_0-1651847173071.png

Picture only read

XQSHEN_1-1651847276862.png

 

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2 Replies
AdzimZM_Intel
Employee
101 Views

Hello,


Did the calibration finished properly in the design?

What is the test_start signal does?

Is there a waitrequest signal in your design?

How do you perform the write and read transaction?


Thanks,

Adzim


AdzimZM_Intel
Employee
83 Views

We do not receive any response from you to the previous question/reply/answer that I have provided. This thread will be transitioned to community support. If you have a new question, feel free to open a new thread to get the support from Intel experts. Otherwise, the community users will continue to help you on this thread. Thank you.



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