Avago Technologies LSI53C1000R User Manual
Page 272
5-30
SCSI SCRIPTS Instruction Set
Version 2.2
Copyright © 2000–2003 by LSI Logic Corporation. All rights reserved.
driven on the SCSI bus. The following table describes the
possible combinations and their corresponding SCSI
phase. These bits are only valid when the LSI53C1000R
is operating in the initiator mode. Clear these bits when
the LSI53C1000R is operating in the target mode.
RA
Relative Addressing Mode
23
When this bit is set, the 24-bit signed value in the
DMA SCRIPTS Pointer Save (DSPS)
register is used as
a relative offset from the current
address, which is pointing
to the next instruction and not the one currently
executing. The relative mode does not apply to
Return and Interrupt SCRIPTS.
Jump/Call an Absolute Address
Start execution at the new absolute address.
Jump/Call a Relative Address
Start execution at the current address plus (or minus) the
relative offset.
MSG
C/D
I/O SCSI Phase
0
0
0
ST Data-Out
0
0
1
ST Data-In
0
1
0
Command
0
1
1
Status
1
0
0
DT Data-Out
1
0
1
DT Data-In
1
1
0
Message-Out
1
1
1
Message-In
Command
Condition Codes
Absolute Alternate Address
Command
Condition Codes
Don’t Care
Alternate Jump Offset