IDT 89HPES16NT2, User Manual

Page: 156 / 292

IDT Non-Transparent Mode Operation
PES16NT2 User Manual 10 - 26 April 15, 2008
Notes PC_IOBASE - I/O Base (0x01C)
PC_IOLIMIT - I/O Limit (0x01D)
PC_SECSTS - Secondary Status (0x01E)
Bit
Field
Field
Name
Type
Default
Value
Description
0 IOCAP RWL 0x1 I/O Capability. Indicates if the bridge supports 16-bit or 32-
bit I/O addressing.
0x0 -(io16) 16-bit I/O addressing.
0x1 - (io32) 32-bit I/O addressing.
3:1 Reserved RO 0x0 Reserved field.
7:4 IOBASE RW 0xF I/O Base. The IOBASE and IOLIMIT registers are used to
control the forwarding of I/O transactions between the pri-
mary and secondary interfaces of the bridge. This field con-
tains A[15:12] of the lowest I/O address aligned on a 4KB
boundary that is below the primary interface of the bridge.
Bit
Field
Field
Name
Type
Default
Value
Description
0 IOCAP RO 0x1 I/O Capability. Indicates if the bridge supports 16-bit or 32-
bit I/O addressing. This bit always reflects the value of the
IOCAP field in the IOBASE register.
3:1 Reserved RO 0x0 Reserved field.
7:4 IOLIMIT RW 0x0 I/O Limit. The IOBASE and IOLIMIT registers are used to
control the forwarding of I/O transactions between the pri-
mary and secondary interfaces of the bridge. This field con-
tains A[15:12] of the highest I/O address, with A[11:0]
assumed to be 0xFFF, that is below the primary interface
of the bridge.
Bit
Field
Field
Name
Type
Default
Value
Description
7:0 Reserved RO 0x0 Reserved field.
8 MDPED RW1C 0x0 Master Data Parity Error. This bit is set when the PERRE
bit is set in the PCI Command register and the bridge
receives a poisoned completion or generates a poisoned
write request on the secondary side of the bridge.
0x0 - (noerror) no error.
0x1 - (error) poisoned write request or completion received
on primary side.
10:9 DVSEL RO 0x0 Not applicable.
11 STAS RO 0x0 Signalled Target Abort Status. Not applicable.
12 RTAS RO 0x0 Received Target Abort Status. Not applicable.
13 RMAS RO 0x0 Received Master Abort Status. Not applicable.