LSI53C875 LSI Logic, LSI53C875 Datasheet - Page 221

• Manufacturer Part Number: LSI53C875
• Description: PCI to Ultra SCSI I/O Processor
• Manufacturer: LSI Logic

Table 6.2
1. Data is shifted through the Carry bit and the Carry bit is shifted into the data byte.
Miscellaneous Notes:
Operator
100
101
110
111
˘ Substitute the desired register name or address for “RegA” in the syntax examples.
˘ data8 indicates eight bits of data.
˘ Use
1
SCSI First Byte Received (SFBR)
Opcode 111
Read-Modify-Write
AND data with register and
place the result in the same
register. Syntax: “Move
RegA & data8 to RegA”
Shift register one bit to the
right and place the result in
the same register. Syntax:
“Move RegA SHR RegA”
Add data to register without
carry and place the result
in the same register.
Syntax: “Move RegA +
data8 to RegA”
Add data to register with
carry and place the result
in the same register.
Syntax: “Move RegA +
data8 to RegA with carry”
Read/Write Instructions (Cont.)
Read/Write Instructions
Opcode 110
Move to SFBR
AND data with register and
place the result in the
First Byte Received (SFBR)
register. Syntax: “Move
RegA & data8 to SFBR”
Shift register one bit to the
right and place the result in
the
Received (SFBR)
Syntax: “Move RegA SHR
SFBR”
Add data to register without
carry and place the result in
the
Received (SFBR)
Syntax: “Move RegA + data8
to SFBR”
Add data to register with
carry and place the result in
the
Received (SFBR)
Syntax: “Move RegA + data8
to SFBR with carry”
instead of data8 to add two register values.
SCSI First Byte
SCSI First Byte
SCSI First Byte
register.
register.
register.
SCSI
Opcode 101
Move from SFBR
AND data with SFBR and
place the result in the
register. Syntax: “Move
SFBR & data8 to RegA”
Shift the
Received (SFBR)
one bit to the right and place
the result in the register.
Syntax: “Move SFBR SHR
RegA”
Add data to SFBR without
carry and place the result in
the register. Syntax: “Move
SFBR + data8 to RegA”
Add data to SFBR with carry
and place the result in the
register. Syntax: “Move
SFBR + data8 to RegA with
carry”
SCSI First Byte
register
6-25