MPC823 datasheet(32/74 Pages) MOTOROLA

32 / 74 page

Communication Processor Module

16-410

MPC823 REFERENCE MANUAL

MOTOROLA

16.11.7.5 USING THE TIME-SLOT ASSIGNER FOR SYNCHRONIZATION. The time-slot

assigner offers a method to internally synchronize a SMCx Transparent channel without

using the SMSYNx pin. This method is similar to that of the SMSYNx pin, except that the

synchronization event is not the falling edge of the SMSYNx signal, but the first time-slot for

this SMCx receiver/transmitter after the frame sync indication. Refer to Section 16.7 The

Serial Interface with Time-Slot Assigner for further information about configuring

time-slots for the SMCs and SCCs.

The time-slot assigner allows the SMCx receiver and transmitter to be enabled

simultaneously and synchronized, a capability that the SMSYNx pin does not provide. Refer

to Figure 16-119 for an example of synchronization using the time-slot assigner.

Figure 16-119. Time-Slot Assigner Synchronization

TDM RX

SMC1

TDM TX

SMC1

TDM TXSYNC

TDM TX CLOCK

SMC1

TDM RX SYNC

TDM RX CLOCK

AFTER TEN IS SET,

TRANSMISSION

BEGINS HERE

IF SMC RUNS OUT OF TX BUFFERS AND NEW ONES

ARE PROVIDED LATER, TRANSMISSION BEGINS AT

THE BEGINNING OF EITHER TIME-SLOT

AFTER REN IS SET

OR AFTER ENTER HUNT

MODE COMMAND,

RECEPTION

BEGINS HERE

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