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6-26 Instruction Set of the I/O Processor
Table 6.2 Read/Write Instructions
Operator
Opcode 111
Read-Modify-Write
Opcode 110
Move to SFBR
Opcode 101
Move from SFBR
000 Move data into register.
Syntax: “Move data8 to
RegA”
Move data into SCSI First
Byte Received (SFBR)
register. Syntax: “Move
data8 to SFBR”
Move data into register.
Syntax: “Move data8 to
RegA”
001
1
Shift register one bit to the
left and place the result in
the same register. Syntax:
“Move RegA SHL RegA”
Shift register one bit to the
left and place the result in
the SCSI First Byte
Received (SFBR) register.
Syntax: “Move RegA SHL
SFBR”
Shift the SCSI First Byte
Received (SFBR) register
one bit to the left and place
the result in the register.
Syntax: “Move SFBR SHL
RegA”
010 OR data with register and
place the result in the same
register. Syntax: “Move
RegA | data8 to RegA”
OR data with register and
place the result in the SCSI
First Byte Received (SFBR)
register. Syntax: “Move
RegA | data8 to SFBR”
OR data with SFBR and
place the result in the
register. Syntax: “Move
SFBR | data8 to RegA”
011 XOR data with register and
place the result in the same
register. Syntax: “Move
RegA XOR data8 to RegA”
XOR data with register and
place the result in the SCSI
First Byte Received (SFBR)
register. Syntax: “Move
RegA XOR data8 to SFBR”
XOR data with SFBR and
place the result in the
register. Syntax: “Move
SFBR XOR data8 to RegA”
100 AND data with register and
place the result in the same
register. Syntax: “Move
RegA & data8 to RegA”
AND data with register and
place the result in the SCSI
First Byte Received (SFBR)
register. Syntax: “Move
RegA & data8 to SFBR”
AND data with SFBR and
place the result in the
register. Syntax: “Move
SFBR & data8 to RegA”
101
1
Shift register one bit to the
right and place the result in
the same register. Syntax:
“Move RegA SHR RegA”
Shift register one bit to the
right and place the result in
the SCSI First Byte
Received (SFBR) register.
Syntax: “Move RegA SHR
SFBR”
Shift the SCSI First Byte
Received (SFBR) register
one bit to the right and place
the result in the register.
Syntax: “Move SFBR SHR
RegA”