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.