1.2.5. Transmitter Serializer
The serializer converts the incoming low-speed parallel data from the transceiver PCS or FPGA fabric to high-speed serial data and sends the data to the transmitter buffer. The Stratix V GX channel serializer supports an 8- and 10-bit, 16- and 20-bit, 32- and 40-bit, and 64-bit serialization factor. By default, the serializer block sends out the LSB of the input data first. For Stratix V GT channels, the serializer only supports a 128-bit serialization factor.
PCIe Receiver Detect
For a PCIe configuration for Gen1, Gen2, and Gen3 data rates, the transmitter buffers have a built-in receiver detection circuit. This receiver detection circuit detects if there is a receiver downstream by sending out a pulse on the common mode of the transmitter and monitoring the reflection.
PCIe Electrical Idle
The transmitter output buffers support transmission of PCIe electrical idle (or individual transmitter tri-state).
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