MPC8280 datasheet(887/1386 Pages) FREESCALE

887 / 1386 page

Serial Management Controllers (SMCs)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

28-33

28.5.6

SMC GCI Monitor Channel TxBD

The CP uses this BD, shown in Figure 28-16, to report about the monitor channel transmit byte.

Table 28-20 describes SMC monitor channel TxBD fields.

28.5.7

SMC GCI C/I Channel RxBD

The CP uses this BD, seen in Figure 28-17, to report information about the C/I channel receive byte.

4–7

—

Reserved, should be cleared.

8–15

DATA

Data field. Contains the monitor channel data byte that the SMC received.

0123

Offset + 0

—DATA

Figure 28-16. SMC Monitor Channel TxBD

Table 28-20. SMC Monitor Channel TxBD Field Descriptions

Bits

Name

Description

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.

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.

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.

Offset + 0

—

C/I DATA

—

Figure 28-17. SMC C/I Channel RxBD

Table 28-19. SMC Monitor Channel RxBD Field Descriptions

Bits

Name

Description

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