Avago Technologies LSI53C1010 - Manual (Page 100)

3-60 The SCSI SCRIPTS Processor Instruction Set
Register
Definition(s) The information listed below describes the DBC and DSPS registers.
COMMAND 0 1 0
STATUS 0 1 1
RES4
4
(DT_DATA_OUT)
3
1 0 0
RES5
4
(DT_DATA_IN
)3
1 0 1
MESSAGE_OUT 1 1 0
MESSAGE_IN 1 1 1
1. 0 - False, negated; 1 - True, asserted. For these phases, SEL is negated and
BSY is asserted.
2. All chips except LSI53C10XX.
3. LSI53C10XX chips.
4. RES4 and RES5 are reserved SCSI phases except in the LSI53C10XX chips.
Table 3.14 SCSI Phase Bit Values (RETURN Format)
1
(Cont.)
Phase Message Command/Data Input/Output
Carry Test When this bit is set, true/false comparisons may be made
based on the ALU Carry bit. The Carry test may not be
combined with other types of comparisons.
True Transfer on TRUE/FALSE condition.
0 - Transfer if condition is FALSE
1 - Transfer if condition is TRUE
Compare
Data Compare data byte to the SFBR register.
0 - Do not compare data
1 - Perform comparison
Compare
Phase Compare current SCSI phase to SCSI phase field or SATN/.
This bit is set whenever the Phase operand is used.
0 - Do not compare phase
1 - Perform comparison
Wait Wait for valid phase. This bit is set by the WHEN operand in
the instruction, and cleared by the IF operand.
0 - Perform comparison immediately
1 - Wait for valid phase (SREQ/ asserted by target)