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DP83640: FX_SD signal question

Part Number: DP83640

Hello everyone,

We are working with the DP83640 PHY using fiber mode and wanted to ask about the FX_SD signal. The fiber transceiver we are using has a 3.3V TTL Signal Detect output, would this be an issue given the FX_SD is PECL? Can it be connected directly? Do we need a level translator or will adding the PÊCL termination resistors enough?

Any help will be welcomed!

Regards.