MPC823 datasheet(3/74 Pages) MOTOROLA

3 / 74 page

Communication Processor Module

MOTOROLA

MPC823 REFERENCE MANUAL

16-381

If the serial management controllers are connected to the TDM, it gets its synchronization

pulse from the time-slot assigner. Otherwise, if a serial management controller is connected

to the NMSI and the Transparent protocol is selected, the serial management controller can

use the SMSYNx pin as a synchronization pin to determine when it must start transmitting

and receiving. The SMSYNx pin is not used, however, when a serial communication

controller is in UART mode.

16.11.1 Features

The following is a list of the serial management controllers’ main features:

• Each serial management controller can implement the UART protocol on its own pins

• Each serial management controller can implement a totally Transparent protocol on a

multiplexed or nonmultiplexed line. If SMC2 uses a nonmultiplexed line, the serial

interface time-slot assigner is not available.

• Each SMCx channel fully supports the circuit interface and monitor channels of the GCI

(IOM-2) in ISDN applications

• Two serial management controllers support the two sets of circuit interface and monitor

channels in the SCIT channels 0 and 1

• Full-duplex operation

• Local loopback and echo capability for testing

16.11.2 General SMCx Mode Register

The operating mode of each serial management controller port is defined by the 16-bit,

memory-mapped, read/write general SMCx mode register (SMCMR). Refer to each specific

SMCx protocol section for information about this register and Table 16-2 (page 16-11) for

specific commands.

16.11.3 SMCx Buffer Descriptor Operation

When the serial management controllers are configured to operate in GCI mode, their

memory structure is predefined as one half-word long for transmit and one half-word long

for receive. For more information on these half-word structures, refer to

Section 16.11.8 The SMCx in GCI Mode.

MPC823 Arkusz danych(PDF) 3 Page - Motorola, Inc