Motorola MPC8260 User Manual
26-32
MPC8260 PowerQUICC II UserÕs Manual
MOTOROLA
Part IV. Communications Processor Module
26.5.4 SMC GCI Commands
26.5.5 SMC GCI Monitor Channel RxBD
This BD is used by the CP to report information about the monitor channel receive byte.
26.5.6 SMC GCI Monitor Channel TxBD
The CP uses this BD to report about the monitor channel transmit byte.
Table 26-18. SMC GCI Commands
Command Description
INIT
TX
AND
RX
PARAMETERS
Initializes transmit and receive parameters in the parameter RAM to their reset state. It is
especially useful when switching protocols on a given serial channel.
especially useful when switching protocols on a given serial channel.
TRANSMIT
ABORT
REQUEST
This receiver command can be issued when the MPC8260 implements the monitor channel
protocol. When it is issued, the MPC8260 sends an abort request on the A bit.
protocol. When it is issued, the MPC8260 sends an abort request on the A bit.
TIMEOUT
This transmitter command can be issued when the MPC8260 implements the monitor channel
protocol. It is usually issued because the device is not responding or A bit errors are detected. The
MPC8260 sends an abort request on the E bit at the time this command is issued.
protocol. It is usually issued because the device is not responding or A bit errors are detected. The
MPC8260 sends an abort request on the E bit at the time this command is issued.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Offset + 0
E
l
ER
MS
Ñ
DATA
Figure 26-15. SMC Monitor Channel RxBD
Table 26-19. SMC Monitor Channel RxBD Field Descriptions
Bits
Name
Description
0
E
Empty.
0 The CP clears E when the byte associated with this BD is available to the core.
1 The core sets E when the byte associated with this BD has been read.
0 The CP clears E when the byte associated with this BD is available to the core.
1 The core sets E when the byte associated with this BD has been read.
1
L
Last (EOM). Valid only for monitor channel protocol and is set when the EOM indication is received on
the E bit. Note that when this bit is set, the data byte is invalid.
the E bit. Note that when this bit is set, the data byte is invalid.
2
ER
Error condition. Valid only for monitor channel protocol. Set when an error occurs on the monitor
channel protocol. A new byte is sent before the SMC acknowledges the previous byte.
channel protocol. A new byte is sent before the SMC acknowledges the previous byte.
3
MS
Data mismatch. Valid only for monitor channel protocol. Set when two different consecutive bytes are
received; cleared when the last two consecutive bytes match. The SMC waits for the reception of two
identical consecutive bytes before writing new data to the RxBD.
received; cleared when the last two consecutive bytes match. The SMC waits for the reception of two
identical consecutive bytes before writing new data to the RxBD.
4Ð7
Ñ
Reserved, should be cleared.
8Ð15
DATA Data Þeld. Contains the monitor channel data byte that the SMC received.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Offset + 0
R
L
AR
Ñ
DATA
Figure 26-16. SMC Monitor Channel TxBD