3 i/o instructions, 1 first dword, I/o instructions – Avago Technologies LSI53C1010R User Manual
Page 264: First dword, First 32-bit word of the i/o instruction, Section 5.3, “i/o instructions
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SCSI SCRIPTS Instruction Set
Version 2.2
Copyright © 2000–2003 by LSI Logic Corporation. All rights reserved.
5.3 I/O Instructions
This section contains information about the I/O Instruction register. It is
divided into First Dword and Second Dword.
5.3.1 First Dword
This section describes the first Dword of the I/O Instruction register.
Figure 5.5
First 32-Bit Word of the I/O Instruction
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 LSI53C1010R is operating in
the initiator or target mode. Opcode selections
0b101–0b111 are considered Read/Write instructions, and
are described in
Section 5.4, “Read/Write Instructions.”
Target Mode
Reselect Instruction
The LSI53C1010R arbitrates for the SCSI bus by
asserting the SCSI ID stored in the
register. If it loses arbitration, it tries again during the next
available arbitration cycle without reporting any lost
arbitration status.
31 30 29
27 26 25 24 23
20 19
16 15
11 10
9
8 7
6
5 4
3
2
0
DCMD Register
DBC Register
IT[1:0] OPC[2:0] RA TI Sel
R
ENDID[3:0]
R
CA TM
R
A
R
ATN
R
0
1
x
x
x
x
x
x
0
0
0
0
x
x
x
x
0
0
0
0
0
x
x
0 0
x
0 0
x
0
0
0
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