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Altera_Forum
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14 years ago

OpenCores 10/100 MAC reports InvalidSymbol

I've built a system with the opencore ethernet MAC connected to the PHY port# 5 of the integrated switch KS8995MA. I can successfully send packets but received packets are reported by the MAC with...
Altera_Forum's avatar
Altera_Forum
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14 years ago

I have experienced exactly the same problem with 1Gbit MAC. Unfortunately I still do not have a solution. My current theory is that it is because I have not properly constrained the rgmii tx interface. This is not done for you by the MAC.

I have been able to reduce the number of 'invalid symbols' by changing the output delay on the tx data/control lines relative to the tx clock however I do not really understand why/how this is the case.

Sorry I cannot offer any advice. I will reply when I get to the bottom of my problem