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5-18 Operating Registers
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. SCSI Output Control Latch (SOCL) is used only when
transferring data using programmed I/O. Some bits are set (1) or cleared
(0) when executing SCSI SCRIPTS. Do not write to the register once the
LSI53C810A starts executing normal SCSI SCRIPTS.
76543210
REQ ACK BSY SEL ATN MSG C/D I/O
00000000