Freescale Semiconductor MPC8260 - Manual (Page 564)

Communications Processor Module Overview
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
14-16 Freescale Semiconductor
NOTE
If a reserved command is issued, the CPM enters an unknown state that
requires an external reset to recover.
The commands in Table 14-7 are described in Table 14-8 .
2
See FCC1 and FCC2 in SBC[6-10] in Table 13-6. Not available on the MPC8250.
Table 14-8. Command Descriptions
Command Description
INIT TX AND RX
PARAMS
Initialize transmit and receive parameters. Initializes the transmit and receive parameters in the
parameter RAM to the values that they had after the last reset of the CP. This command is especially
useful when switching protocols on a given peripheral controller.
INIT MCC RX AND
TX PARAMS —
ONE CHANNEL
1
Initialize receive and transmit parameters. Initializes the receive and transmit parameters of the
peripheral controller. Differs from INIT RX AND TX PARAMS in that, for the MCCs, issuing INIT RX
AND TX PARAMS initializes 32 consecutive channels beginning with the channel number specified
in CPCR[MCN], but issuing INIT MCC RX AND TX—ONE CHANNEL initializes only the channel in
the command; see
Section 28.7, “MCC Commands .”
INIT RX PARAMS Initialize receive parameters. Initializes the receive parameters of the peripheral controller. Note that
for the MCCs, issuing this command initializes only 32 channels at a time; see
Section 28.7, “MCC
Commands .”
INIT MCC RX
PARAMS —
ONE CHANNEL
1
Initialize MCC receive parameters for only a single channel according to MCC channel number field.
See
Section 28.7, “MCC Commands .”
INIT TX PARAMS Initialize transmit parameters. Initializes the transmit parameters of the peripheral controller. Note
that for the MCCs, issuing this command initializes only 32 channels at a time; see
Section 28.7,
“MCC Commands .”
INIT TX PARAMS —
ONE CHANNEL
1
Initialize MCC transmit parameters for only a single channel according to MCC channel number
field. See
Section 28.7, “MCC Commands .”
ENTER HUNT
MODE
Enter hunt mode. Causes the receiver to stop receiving and begin looking for a new frame. The exact
operation of this command may vary depending on the protocol used.
STOP TX Stop transmission. Aborts the transmission from this channel as soon as the transmit FIFO has been
emptied. It should be used in cases where transmission needs to be stopped as quickly as possible.
Transmission proceeds when the
RESTART command is issued.
GRACEFUL STOP
TX
Graceful stop transmission. Stops the transmission from this channel as soon as the current frame
has been fully transmitted from the transmit FIFO. Transmission proceeds when the RESTART
command is issued and the R-bit is set in the next TxBD.
RESTART TX Restart transmission. Once the STOP TX command has been issued, this command is used to
restart transmission at the current BD.
CLOSE RXBD Close RxBD. Causes the receiver to close the current RxBD, making the receive buffer immediately
available for manipulation by the user. Reception continues using the next available BD. Can be
used to access the buffer without waiting until the buffer is completely filled by the SCC.
START IDMA See Section 19.9, “IDMA Commands .”
STOP IDMA See Section 19.9, “IDMA Commands .”
SET TIMER Set timer. Activates, deactivates, or reconfigures one of the 16 timers in the RISC timer table.