Motorola MPC860 PowerQUICC User Manual page 592

Part V. The Communications Processor Module
popular ISDN basic rate buses interchip digital link (IDL) and general circuit interface
(GCI, also known as IOM-2) are supported. With two TDM channels, the TSA can
simultaneously support two different TDM frame formats.
TSA programming is independent of the protocol used by the SCC or SMC. The SCCs and
SMCs can be programmed for any synchronous protocol without affecting TSA
programming. The TSA simply routes programmed portions of the received data frame
from the TDM pins to the target SCCs and SMCs, while the target SCC or SMC handles
the received data in the actual protocol.
In its simplest mode, the TSA identiÞes both Rx and Tx frames using one sync pulse and a
single clock signal provided by the user externally. This mode can be enhanced to allow
independent routing of Tx and Rx data on the TDM channel. The user deÞnes the length of
a time slot, which need not be limited to 8 bits or even to a single contiguous position within
the frame. For more ßexibility, the user can also provide separate Rx and Tx syncs as well
as independent clocks. Figure 21-2 shows example TSA conÞgurations ranging from the
simplest to the most complex.
21-4 MPC860 PowerQUICC UserÕs Manual MOTOROLA