Avago Technologies LSI8751D - Manual (Page 137)

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Register: 0x09 (0x89)
SCSI Output Control Latch (SOCL)
Read/Write
REQ Assert SCSI REQ/ Signal 7
ACK Assert SCSI ACK/ Signal 6
BSY Assert SCSI BSY/ Signal 5
SEL Assert SCSI SEL/ Signal 4
ATN Assert SCSI ATN/ Signal 3
MSG Assert SCSI MSG/ Signal 2
C/D Assert SCSI C_D/ Signal 1
I/O Assert SCSI I_O/ Signal 0
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.
7 6 5 4 3 2 1 0
REQ ACK BSY SEL ATN MSG C/D I/O
0 0 0 0 0 0 0 0