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Communication Processor Module
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.
0
1
2
R
L
AR
OFFSET + 0
NOTE: You are only responsible for initializing the items in bold.
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.
16-428
3
4
5
6
7
RESERVED
MPC823e REFERENCE MANUAL
8
9
10
11
12
DATA
13
14
15
MOTOROLA
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