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4-4
OPCODE -
Command Opcode (GCI Mode Only)
These bits are set by the M68000 core to define the specific GCI
command. See 4.7 SERIAL MANAGEMENT CONTROLLERS (SMCs)
for more details.
00 =TRANSMIT ABORT REQUEST; the GCI receiver sends an abort
request on the E bit.
01 =TIMEOUT Command
10 =Reserved
11 =Reserved
0 =When the GCI bit is zero, the commands are as follows:
OPCODE -
Command Opcode
These bits are set by the M68000 core to define the specific
sec
command. The command execution details depend on the protocol
chosen.
The detailed command description for the UART protocol is pre-
sented in 4.5.11 UART Controller.
The detailed command description for the HDLC protocol is pre-
sented in 4.5.12 HDLC Controller.
The detailed command description for the BISYNC protocol is pre-
sented in 4.5.13 BISYNC Controller.
The detailed command description for the DDCMP protocol is pre-
sented in 4.5.14 DDCMP Controller.
The detailed command description for the V.110 protocol is pre-
sented in 4.5.15 V.110 Controller.
OO=STOP TRANSMIT Command
01 =RESTART TRANSMIT Command
10=ENTER HUNT MODE Command
11 =RESET RECEIVER BCS GENERATOR (used only in BISYNC
mode)
Bit 3 - Reserved bit; should be set to zero.
CH. NUM. - Channel Number
These bits are set by the M68000 core to define the specific
sec
channel
that the command is to operate upon.
OO=SCC1
01 =SCC2
10=SCC3
11 =Reserved
MC68302 USER'S MANUAL
MOTOROLA
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