Avago Technologies LSI53C876E User Manual
Page 221
Transfer Control Instructions
5-31
True/False bit fields. If the comparisons are true, and the
Interrupt-on-the-Fly bit (
, bit 2) is
set, the LSI53C876 asserts the Interrupt-on-the-Fly bit.
SCSIP[2:0]
SCSI Phase
[26:24]
This 3-bit field corresponds to the three SCSI bus phase
signals which are compared with the phase lines latched
when SREQ/ is asserted. Comparisons can be performed
to determine the SCSI phase actually being driven on the
SCSI bus. The following table describes the possible
combinations and their corresponding SCSI phase.
These bits are only valid when the LSI53C876 is
operating in Initiator mode. Clear these bits when the
LSI53C876 is operating in the Target mode.
RA
Relative Addressing Mode
23
When this bit is set, the 24-bit signed value in the
register is used as a
relative offset from the current
address (which is pointing to the next instruction,
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.
MSG
C/D
I/O SCSI Phase
0
0
0
Data-Out
0
0
1
Data-In
0
1
0
Command
0
1
1
Status
1
0
0
Reserved-Out
1
0
1
Reserved-In
1
1
0
Message-Out
1
1
1
Message-In
Command
Condition Codes
Absolute Alternate Address