MPC823 datasheet(48/74 Pages) MOTOROLA

48 / 74 page

Communication Processor Module

16-426

MPC823 REFERENCE MANUAL

MOTOROLA

AR—Abort Request

This bit is only valid when a serial management controller uses the monitor channel

protocol and it is set by a serial management controller when an abort request is

received on the A bit. The SMCx transmitter transmits the EOM on the E bit after an

abort request is received.

Bits 3–7—Reserved

These bits are reserved and must be set to 0.

DATA—Data Field

This field contains the data to be transmitted by a serial management controller on the

monitor channel.

• C/I_RXBD—The SMCx circuit interface channel receive (RX) buffer descriptor is used

by the communication processor module to report information about the circuit interface

channel receive byte.

E—Empty

0 =

The communication processor module clears this bit to indicate that the data

byte associated with this buffer descriptor is now available to the core.

1 =

The core set this bit to indicate that the data byte associated with this buffer

descriptor has been read.

Bits 1–7 and 14–15—Reserved

These bits are reserved and must be set to 0.

C/I DATA—Command/Indication Data Bits

This field represents a 4-bit data field for circuit interface channel 0 and a 6-bit data field

for circuit interface channel 1. It contains the data received from the circuit interface

channel. For circuit interface channel 0, bits 10-13 contain the 4-bit data field and bits

8 and 9 are always written with zeros. For circuit interface channel 1, bits 8-13 contain

the 6-bit data field.

OFFSET + 0

RES

C/I DATA

RESERVED

Note: Additional data received is discarded until the E bit is set.

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