MPC823 datasheet(47/74 Pages) MOTOROLA

47 / 74 page

Communication Processor Module

MOTOROLA

MPC823 REFERENCE MANUAL

16-425

L—Last (EOM)

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

channel protocol and is set when the EOM indication is received on the E bit. When this

bit is set, the data byte is invalid.

ER—Error Condition

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

channel protocol and is set when an error condition occurs on the monitor channel

protocol. A new byte is transmitted before a serial management controller

acknowledges the previous byte.

MS—Data Mismatch

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

channel protocol. It is set when two different consecutive bytes are received and it is

cleared when the last two consecutive bytes match. A serial management controller

waits for the reception of two identical consecutive bytes before writing new data to the

RX buffer descriptor.

Bits 4–7—Reserved

These bits are reserved and must be set to 0.

DATA—Data

This field contains the monitor channel data byte that a serial management controller

received.

• M_TXBD—The SMCx monitor channel transmit buffer descriptor is used by the

communication processor module to report information about the monitor channel

transmit byte.

R—Ready

0 =

This bit is cleared by the communication processor module after transmission.

The TX buffer descriptor is now available to the core.

1 =

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

descriptor is ready for transmission.

L—Last (EOM)

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

channel protocol. When it is set, a serial management controller first transmits the buffer

data and then transmits the EOM indication on the E bit.

OFFSET + 0

RESERVED

DATA

NOTE: You are only responsible for initializing the items in bold.

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