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Altera_Forum
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11 years ago

DE0-Nano Ethernet add on board

Dear all I'm student of electrical engineering in university of tehran. Recently i designed an add on board for DE0-Nano board which provide it Ethernet interface. http://www.alterafo...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

Dear ted,

As you suggest, i use 10/100/100 TSE MAC core and check statistics counters. for more simpler test, i enabled loop-back feature of MAC core.

But another confusing problem appeared!

When i send a string vi jtag_uart, 'aFramesTransmittedOK' increament by one but 'aFramesReceivedOK' stay 0.

More intresting is that register 'aFrameCheckSequenceErrors' and 'aAlignmentErrors', both increament in each of my send!

I'm just working in loop back mode! why should i have CRC/Alignment error?

In real test with PHY, as picture of wireshark showed, i'm sure that TX path of system works correctly.

Now the statistics counters of MAC showed that packet are received with CRC/Alignment error.

Do you have any idea?

Thanks.