The optimal use of bandwidth requires that TX Local bus data be able to be written at a faster
rate than 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 and operate in the same manner as with the regular
LBUS. When responding to back-pressure during a clock cycle, none of the
tx_enain<N> can be active.