TX Back Pressure - 3.1 English

UltraScale+ Devices Integrated 100G Ethernet Subsystem Product Guide (PG203)

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3.1 English

The optimal use of bandwidth requires that TX local bus data can be written at a rate faster than it can be delivered on the serial interface. This means that there must be back pressure, or flow-control, on the TX segmented LBUS. The signals used to implement back pressure are tx_rdyout and tx_ovfout. These signals are common for all segments. When responding to back pressure during a clock cycle, none of the tx_enainS can be active.