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Altera_Forum's avatar
Altera_Forum
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14 years ago

Urgent: Different timing analysis result for DMA

Hello, I did a timing analysis for DMA to transfer 2MB of data. The first time i executed it, using DMA, the system improved by 88.75%. When I ran it for 2nd time, the performance became 48.5% only. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Do you run it twice in a row from the same software, do you re-upload a new software between the two tests, or are you reconfiguring the FPGA and upload the software between the two tests?

You should put some Signaltap probes on the DMA's master to see if anything different is happening during the tests.