TX Backpressure - 1.2 English

Versal ACAP Integrated 600G Interlaken with FEC Subsystem Product Guide (PG371)

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1.2 English

The optimal use of bandwidth requires that TX AXI4-Stream data be able to be written at a rate faster than can be delivered on the serial interface. This means that there must be backpressure or flow-control on the TX segmented AXI4-Stream bus. The signals used to implement backpressure are c0_tx_rdyout and c0_tx_ovfout. These signals are common for all segments. When responding to backpressure during a clock cycle, none of the tx_axis_tuser_ena<M> can be active.