Arria® 10 Hard Processor System Technical Reference Manual
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20.4.3.1. Transmit and Receive
When TMOD = 0, both transmit and receive logic are valid. The data transfer occurs as normal according to the selected frame format (serial protocol). Transmit data are popped from the transmit FIFO buffer and sent through the txd line to the target device, which replies with data on the rxd line. The receive data from the target device is moved from the receive shift register into the receive FIFO buffer at the end of each data frame. †