Intel
®
81341 and 81342 I/O Processors
December 2007
Developer’s Manual
Order Number: 315037-002US
377
Address Translation Unit (PCI Express)—Intel
®
81341 and 81342
3.16.93 Outbound I/O Window Translate Value Register - OIOWTVR
The Outbound I/O Window Translate Value Register (OIOWTVR) contains the PCI I/O
address used to convert the internal bus access to a PCI address. This address is driven
on the PCI Express Link as a result of the outbound ATU address translation. See
Section 3.3.2.1, “Outbound Address Translation - Internal Bus Transactions” on
for details on outbound address translation.
The I/O window is from 81341 and 81342 internal bus is set via the
Base Address Register - OIOBAR”
with the a fixed length of 64 Kbytes.
Table 227. Outbound I/O Window Translate Value Register - OIOWTVR
Bit
Default
Description
31:16
0000H
Outbound I/O Window Translate Value - Used to convert internal bus addresses to PCI addresses.
15:01
0000H
Reserved
00
0
Big Endian Byte Swap enable - When set the ATU performs a byte swap on all PCI read/write
transactions through OIOBAR. When clear, no swap is performed. Refer to
for more details.
PCI
IOP
Attributes
Attributes
28
24
20
16
12
8
4
0
31
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rv
rw
rw
Attribute Legend:
RV = Reserved
PR = Preserved
RS = Read/Set
RW = Read/Write
RC = Read Clear
RO = Read Only
NA = Not Accessible
Internal Bus Address Offset
+304H