User manual

Serial Management Controllers (SMCs)
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor 27-33
27.5.6 SMC GCI Monitor Channel TxBD
The CP uses this BD, shown in Figure 27-16, to report about the monitor channel transmit byte.
Table 27-20 describes SMC monitor channel TxBD fields.
27.5.7 SMC GCI C/I Channel RxBD
The CP uses this BD, seen in Figure 27-17, to report information about the C/I channel receive byte.
Table 27-19. 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.
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.
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.
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.
4–7 — Reserved, should be cleared.
8–15 DATA Data field. Contains the monitor channel data byte that the SMC received.
0123 78 15
Offset + 0 R L AR —DATA
Figure 27-16. SMC Monitor Channel TxBD
Table 27-20. 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.
1 L Last (EOM). Valid only for monitor channel protocol. When L = 1, the SMC first transmits the buffer
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.
3–7 — Reserved, should be cleared.
8–15 DATA Data field. Contains the data to be sent by the SMC on the monitor channel.