Avago Technologies LSI53C825AE - Manual (Page 205)

I/O Instruction 5-21
Use this bit only in conjunction with the Select, Reselect,
Wait Select, and Wait Reselect instructions. Use bits 25
and 26 individually or in combination to produce the
following conditions:
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
Bit 25 Bit 26 Addressing Mode
0 0 Direct
0 1 Table Indirect
1 0 Relative
1 1 Table Relative
Command ID Not Used Not Used
Absolute Alternate Address
Command Table Offset
Absolute Alternate Address
Command ID Not Used Not Used
Absolute Jump Offset