Avago Technologies LSI8751D - Manual (Page 215)

I/O Instruction 6-19
Direct
Uses the device ID and physical address in the
instruction.
Table Indirect
Uses the physical jump address, but fetches data using
the table indirect method.
Relative
Uses the device ID in the instruction, but treats the
alternate address as a relative jump.
Table Relative
Treats the alternate jump address as a relative jump and
fetches the device ID, synchronous offset, and
synchronous period indirectly. The value in bits [23:0] of
the first four bytes of the SCRIPTS is added to the data
structure base address to form the fetch address.
Sel Select with ATN/ 24
This bit specifies whether SATN/ is asserted during the
selection phase when the LSI53C875 is executing a
Select instruction. When operating in Initiator mode, set
this bit for the Select instruction. If this bit is set on any
other I/O instruction, an illegal instruction interrupt is
generated.
Command ID Not Used Not Used
Absolute Alternate Address
Command Table Offset
Absolute Alternate Address
Command ID Not Used Not Used
Absolute Jump Offset
Command Table Offset
Alternate Jump Offset