LSI 53C810A User Manual
I/O Instruction
6-13
indirect addressing, the value in this field is an offset into
a table pointed to by the
a table pointed to by the
The table entry contains byte count and address
information.
information.
6.4 I/O Instruction
The I/O SCRIPTS instruction causes the LSI53C810A to trigger common
SCSI hardware sequences such as Set/Clear ACK, Set/Clear ATN,
Set/Clear Target Mode, Select With ATN, or Wait for Reselect.
SCSI hardware sequences such as Set/Clear ACK, Set/Clear ATN,
Set/Clear Target Mode, Select With ATN, or Wait for Reselect.
6.4.1 First Dword
IT[1:0]
Instruction Type - I/O Instruction
[31:30]
OPC[2:0]
OpCode
[29:27]
The following OpCode bits have different meanings,
depending on whether the LSI53C810A is operating in
initiator or target mode.
depending on whether the LSI53C810A is operating in
initiator or target mode.
Note:
OpCode selections 101–111 are considered Read/Write
instructions, and are described
instructions, and are described
Target Mode
OPC2 OPC1 OPC0
Instruction Defined
0
0
0
Reselect
0
0
1
Disconnect
0
1
0
Wait Select
0
1
1
Set
1
0
0
Clear