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Julien
Icon for Occasional Contributor rankOccasional Contributor
7 years ago

NIOSII/e peripheral IO read access performance?

Hi, I am using a design that includes a NIOSII/e (the "e" is important here), that accesses a UART IP as an Avalon slave. Works fine, but I timed the duration of each individual word read access, an...
Julien's avatar
Julien
Icon for Occasional Contributor rankOccasional Contributor
7 years ago

Hi Anand,

Yes I do understand that the Avalon transaction itself takes several cycles. However, what I do not understand is why there is such a large difference between the order of magnitude I expect (10 cycles = 200ns) and the time I measure (~5µs) which is 25 times (!) slower than I expected, so there must be something wrong in my design.

How you would recommend I proceed to investigate this further ? What would be a way to observe the transactions to know for sure how many cycles each transaction takes ?

Regards,

Julien