Motorola MPC8260 - Manual (Page 444)

13-14 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA
Part IV. Communications Processor Module
The commands in Table 13-7 are described in Table 13-8.
Table 13-8. 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 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 27.9, ÒMCC
Commands.Ó
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 27.9, ÒMCC
Commands.Ó
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 Þlled by the SCC.
START IDMA See Section 18.9, ÒIDMA Commands.Ó
STOP IDMA See Section 18.9, ÒIDMA Commands.Ó
SET TIMER Set timer. Activates, deactivates, or reconÞgures one of the 16 timers in the RISC timer table.
SET GROUP
ADDRESS
Set group address. Sets a bit in the hash table for the Ethernet logical group address recognition
function.
GCI ABORT
REQUEST
GCI abort request. The GCI receiver sends an abort request on the E-bit.
GCI TIMEOUT GCI time-out. The GCI performs the timeout function.
RESET BCS Reset block check sequence. Used in BISYNC mode to reset the block check sequence calculation.
MCC STOP
TRANSMIT
See Section 27.9, ÒMCC Commands.Ó
MCC STOP
RECEIVE
See Section 27.9, ÒMCC Commands.Ó
ATM TRANSMIT See Section 29.14, ÒATM Transmit Command.Ó
RANDOM
NUMBER
Generate a random number and put it in dual-port RAM; see RAND in Table 13-10.