LSI LSI53C895A, Technical Manual

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Transfer Control Instructions 5-29
valid when the LSI53C895A is operating in Initiator mode.
Clear these bits when the LSI53C895A is operating in
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 DMA SCRIPTS Pointer
(DSP) 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.
Jump/Call a Relative Address
Start execution at the current address plus (or minus) the
relative offset.
Table 5.5 SCSI Phase Comparisons
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
1 0 1 Reserved
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