LSI53C875 LSI Logic, LSI53C875 Datasheet - Page 215
LSI53C875
Manufacturer Part Number
LSI53C875
Description
PCI to Ultra SCSI I/O Processor
Manufacturer
LSI Logic
Datasheet
1.LSI53C875.pdf
(314 pages)
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I/O Instruction
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.
Select with ATN/
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
Command
Command
Command
Absolute Alternate Address
Absolute Alternate Address
Alternate Jump Offset
Absolute Jump Offset
ID
ID
Table Offset
Table Offset
Not Used
Not Used
Not Used
Not Used
6-19
24
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