6 smc gci monitor channel txbd, Figure 27-16. smc monitor channel txbd, 7 smc gci c/i channel rxbd – Freescale Semiconductor MPC8260 User Manual
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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
, to report about the monitor channel transmit byte.
describes SMC monitor channel TxBD fields.
27.5.7
SMC GCI C/I Channel RxBD
, 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.
0
1
2
3
7
8
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.