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How to initiate loopback mode on am79c874?

Question asked by on Jan 11, 2016

How do I initiate loopback mode on an AM79C874?

I have set the local loopback bit in register 0, and I'm toggling the TXD pins, but no data comes out RXD pins.  What other bits need to be set to get data to pass through device?

Does the TXD data have to be formatted in a specific manner?