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Command Set
MC68360 USER’S MANUAL
GRACEFUL STOP TX. This command stops the transmission from this channel as soon
as the current frame has been fully transmitted from the transmit FIFO. Transmission will
proceed once the RESTART command is issued and the R-bit is set in the next transmit
buffer descriptor.
RESTART TX. When the STOP TX command has been issued, this command can be
used to restart the transmission at the current buffer descriptor.
CLOSE RX BD. This command causes the receiver to simply close the current receive
buffer descriptor, making the receive buffer immediately available for manipulation by the
user. Reception continues normally using the next available buffer descriptor. This com-
mand may be used to access the data buffer without waiting until the data buffer is com-
pletely filled by the SCC
SET TIMER. This command activates, deactivates, or
reconfigures one of the 16 timers in the RISC timer table.
SET GROUP ADDRESS. This command sets a bit in the hash table for the Ethernet log-
ical group address recognition function.
GCI ABORT REQUEST. The GCI receiver sends an abort request on the E-bit.
GCI TIMEOUT. The GCI performs the timeout function.
RESET BCS. This command is used in BISYNC mode to reset the block check sequence
calculation.
Undefined (U). Reserved for use by Motorola-supplied RAM microcodes.
CH NUM—Channel Number
These bits are set by the host to define the specific sub-block on which the command is
to operate. Some sub-blocks share channel number encodings if their commands are mu-
tually exclusive.
0000
SCC1
0001
0010
0011
0100
SCC2
0101
SPI/RISC Timers
0110
0111
1000
SCC3
1001
SMC1/IDMA1
1010
1011
1100
SCC4
1101
SMC2/IDMA2
1110
1111
FLG—Command Semaphore Flag
The bit is set by the host and cleared by the CP.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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