LSI53C875 LSI Logic, LSI53C875 Datasheet - Page 137

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

Register: 0x09 (0x89)
SCSI Output Control Latch (SOCL)
Read/Write
REQ
ACK
BSY
SEL
ATN
MSG
C/D
I/O
This register is used primarily for diagnostic testing or programmed I/O
operation. It is controlled by the SCRIPTS processor when executing
SCSI SCRIPTS. SOCL is used only when transferring data using
programmed I/O. Some bits are set (1) or reset (0) when executing SCSI
SCRIPTS. Do not write to the register once the LSI53C875 starts
executing normal SCSI SCRIPTS.
REQ
7
0
ACK
6
0
Assert SCSI REQ/ Signal
Assert SCSI ACK/ Signal
Assert SCSI BSY/ Signal
Assert SCSI SEL/ Signal
Assert SCSI ATN/ Signal
Assert SCSI MSG/ Signal
Assert SCSI C_D/ Signal
Assert SCSI I_O/ Signal
BSY
5
0
SEL
4
0
ATN
3
0
MSG
2
0
C/D
1
0
I/O
0
0
5-21
7
6
5
4
3
2
1
0