18.104.22.168. FGT PMA Loopback Modes
The PHY contains multiple parallel, serial data, and clock loopbacks across PHY interfaces for BIST. These loopbacks provide support for multiple PHY configurations.
- A. PMA-transmitter-to-receiver buffer loopback: loops back the transmitter pre-driver differential I/O signals to the midpoint of the receiver equalizer
- B. PMA-transmitter-to-receiver parallel loopback: parallel loopback from the PMA transmit lane 64 bit data ports to the receive lane 64 bit data ports
- C. PMA-receiver-to-transmitter parallel loopback: parallel loopback from the PMA receive lane 64 bit data ports to the transmit lane 64 bit data ports
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