Avago Technologies LSI53C1010 - Manual (Page 70)

3-30 The SCSI SCRIPTS Processor Instruction Set
Description The SCSI Jump instruction is a conditional jump to the destination
address, if the SCSI phase, data, or attention condition compares true
with the phase, data, or attention condition described in the instruction.
If the comparison is false, the SCRIPTS processor does not branch to
the destination but instead fetches the next instruction and continues
execution.
When the optional data field is used, it is compared to the SFBR. This
contains the most recent byte of any type of data that has been moved
into the SFBR register. The SCSI SCRIPTS program determines which
routine to execute next based on received data values. Using a series of
Carry Test When this bit is set, true/false comparisons are based on the
ALU Carry bit. Comparisons to the state of the Carry flag may
not be made in conjunction with other 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 first byte of the received data.
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)
Mask An 8-bit field that is used to mask the value in SFBR before
the comparison with the data field in the instruction takes
place. As a result of this operation, any bits that are set will
cause the corresponding bit in the data byte to be ignored. If
this field is not specified, a mask of 0x00 is used.
Data An 8-bit field that is compared with the incoming data after the
mask operation of the mask byte takes place. Comparison
indicates either an equal or not equal condition. If the Data
field is not specified, the Compare Data bit is cleared and
0x00 is coded for both the mask and data bytes.
Destination
Address A 32-bit address (or 24-bit offset) where execution will
continue if the jump is executed.