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 Figure27-16, to report about the monitor channel transmit byte.

Table27-20 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.

Table27-19. SMC Monitor Channel RxBD Field Descriptions

Bits Name Description
0EEmpty.
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.
2ER 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.
3MS 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 RLAR —DATA

Figure 27-16. SMC Monitor Channel TxBD

Table27-20. SMC Mon itor Channel TxBD Field Descriptions

Bits Name Description
0RReady.
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.
2AR 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.