Avago Technologies LSI53C1010R User Manual
Page 269
I/O Instructions
5-21
Version 2.2
Copyright © 2000–2003 by LSI Logic Corporation. All rights reserved.
•
The I/O data structure must lie within the 8 Mbytes
above or below the base address.
•
An I/O command structure must have all four bytes
contiguous in system memory, as follows. The
offset/period bits are ordered as in the
register. The configuration bits
are ordered as in the
register.
Use this bit only in conjunction with the Select, Reselect,
Wait Select, and Wait Reselect instructions. It is allowable
to set bits 25 and 26 individually or in combination:
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.
Config
ID
Offset/period
00
Bit 25
Bit 26
Direct
0
0
Table Indirect
0
1
Relative
1
0
Table Relative
1
1
Command
ID
Not Used
Not Used
Absolute Alternate Address
Command
Table Offset
Absolute Alternate Address