Motorola MPC8260 User Manual
MOTOROLA
Chapter 26. Serial Management Controllers (SMCs)
26-33
Part IV. Communications Processor Module
Table 26-20 describes SMC monitor channel TxBD Þelds.
26.5.7 SMC GCI C/I Channel RxBD
The CP uses this BD to report information about the C/I channel receive byte.
26.5.8 SMC GCI C/I Channel TxBD
The CP uses this BD to report about the C/I channel transmit byte.
Table 26-20. SMC Monitor Channel TxBD Field Descriptions
Bits
Name
Description
0
R
Ready.
0 Cleared by the CP after transmission. The TxBD is now available to the core.
1 Set by the core when the data byte associated with this BD is ready for transmission.
0 Cleared by the CP after transmission. The TxBD is now available to the core.
1 Set by the core when the data byte associated with this BD is ready for transmission.
1
L
Last (EOM). Valid only for monitor channel protocol. When L = 1, the SMC Þrst transmits the buffer
data and then transmits the EOM indication on the E bit.
data and then transmits the EOM indication on the E bit.
2
AR
Abort request. Valid only for monitor channel protocol. Set by the SMC when an abort request is
received on the A bit. The transmitter sends the EOM on the E bit after receiving an abort request.
received on the A bit. The transmitter sends the EOM on the E bit after receiving an abort request.
3Ð7
Ñ
Reserved, should be cleared.
8Ð15 DATA
Data Þeld. Contains the data to be sent by the SMC on the monitor channel.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Offset + 0
E
Ñ
C/I DATA
Ñ
Figure 26-17. SMC C/I Channel RxBD
Table 26-21. SMC C/I Channel RxBD Field Descriptions
Bits
Name
Description
0
E
Empty.
0 Cleared by the CP to indicate that the byte associated with this BD is available to the core.
1 The core sets E to indicate that the byte associated with this BD has been read.
Note that additional data received is discarded until E bit is set.
0 Cleared by the CP to indicate that the byte associated with this BD is available to the core.
1 The core sets E to indicate that the byte associated with this BD has been read.
Note that additional data received is discarded until E bit is set.
1Ð7
Ñ
Reserved, should be cleared.
8Ð13
C/I DATA Command/indication data bits. For C/I channel 0, bits 10Ð13 contain the 4-bit data Þeld and bits 8Ð
9 are always written with zeros. For C/I channel 1, bits 8Ð13 contain the 6-bit data Þeld.
14Ð15 Ñ
Reserved, should be cleared.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Offset + 0
R
Ñ
C/I DATA
Ñ
Figure 26-18. SMC C/I Channel TxBD