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Altera_Forum's avatar
Altera_Forum
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14 years ago

rx_freqlocked signal on Cyclone IV GX

I'm seeing strange behavior from the rx_freqlocked signal that's output from the Cyclone IV transceiver block in basic mode. According to the transceiver documentation: --- Quote Start --...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

After a month the results of my service request have been unfruitful. the rx_freqlocked signal seems to be simply broken in my system.

I'm using Quartus 11.0sp1 on a Cyclone IV GX device. The altgxb is in basic mode.

Does this signal work for anyone? What I'm seeing is the signal goes active after the receive analog reset is deasserted. It remains active no matter what happens on the data line. This is running in automatic lock mode.

I've tried manual lock mode, but the signal behaves the same no matter what I do with the locktodata and locktoref lines. It indicates locked after releasing analog reset and remains stuck high no matter how I chance those inputs.

If anyone has any insight into this it would be greatly appreciated!

S