I understood that pstrb = "0000" during read transaction.
But what happens if pstrb = "0000" during write transaction.
Does data successfully transafered without update?
And also I want to know if it is possible to use pstrb = "0101", "1010" or "1001"
Thank you for answering my question.
I could solve my curiosity.
I also wonder why we must drive all bits of PSTB LOW for read transacitons.
As PSTRB gives validity to data on write bus, I thought that it's because only one transaction is available on APB at once.
But we can use PWRITE signal to avoid it.
If I get an answer, I'll let you know.