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Altera_Forum's avatar
Altera_Forum
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12 years ago

TSE Gigabit will not generate TX pause frames

Hello, I have done everything I can see to try for over a day now but have been unable to get pause frames to be transmitted on a Gigabit link. Even with XOFF_GEN set in the command register n...
Altera_Forum's avatar
Altera_Forum
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12 years ago

Thank you both. I didn't consider that the pause frames I see at 100MbS (in WireShark) are from the switch. Which means the switch could also be stripping out the ones sent from the TSE. I can run direct and prove that out.

Then I wonder am I just over-interrupting the Cyclone? Can I have the SGDMA collect up to 8 packets before interrupting? I know the PowerPC can do this to reduce interrupt overhead, but it also generates an interrupt after a very small delay in receiving a packet so a single packet isn't stranded.

I tried to manually send a pause frame on the receipt of every packet and it did not work.

Bill