XIO2000AI TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS], XIO2000AI Datasheet - Page 73
XIO2000AI
Manufacturer Part Number
XIO2000AI
Description
PCI Express to PCI Bus Translation Bridge
Manufacturer
TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS]
Datasheet
1.XIO2000AI.pdf
(159 pages)
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4.30 Capability ID Register
4.31 Next Item Pointer Register
April 2007 Revised October 2008
BIT
2
1
0
This read-only register identifies the linked list item as the register for PCI power management. The register
returns 01h when read.
The contents of this read-only register indicate the next item in the linked list of capabilities for the bridge. This
register reads 60h pointing to the MSI capabilities registers.
RESET STATE
RESET STATE
BIT NUMBER
BIT NUMBER
FIELD NAME
SERR_EN
PERR_EN
PCI register offset:
Register type:
Default value:
PCI register offset:
Register type:
Default value:
ISA
ACCESS
Table 4−17. Bridge Control Register Description (Continued)
7
0
7
0
RW
RW
RW
6
0
6
1
ISA enable. This bit modifies the response by the bridge to ISA I/O addresses. This applies only to
I/O addresses that are enabled by the I/O base and I/O limit registers and are in the first 64 KB of
PCI I/O address space (0000 0000h to 0000 FFFFh). If this bit is set, then the bridge blocks any
forwarding from primary to secondary of I/O transactions addressing the last 768 bytes in each
1 KB block. In the opposite direction (secondary to primary), I/O transactions are forwarded if they
address the last 768 bytes in each 1K block.
SERR enable. This bit controls forwarding of system error events from the secondary interface to
the primary interface. The bridge forwards system error events when:
•
•
•
Parity error response enable. Controls the bridge’s response to data, uncorrectable address, and
attribute errors on the secondary interface. Also, the bridge always forwards data with poisoning,
from conventional PCI to PCI Express on an uncorrectable conventional PCI data error, regardless
of the setting of this bit.
0 = Forward downstream all I/O addresses in the address range defined by the I/O base and
1 = Forward upstream ISA I/O addresses in the address range defined by the I/O base and I/O
0 = Disable the forwarding of system error events (default)
1 = Enable the forwarding of system error events
0 = Ignore uncorrectable address, attribute, and data errors on the secondary interface
1 = Enable uncorrectable address, attribute, and data error detection and reporting on the
This bit is set
Bit 8 (SERR_ENB) in the command register (offset 04h, see Section 4.3) is set
SERR is asserted on the secondary interface
5
0
5
1
I/O limit registers (default)
limit registers that are in the first 64 KB of PCI I/O address space (top 768 bytes of each
1-KB block)
(default)
secondary interface
50h
Read-only
01h
51h
Read-only
60h
4
0
4
0
3
0
3
0
2
0
2
0
1
0
1
0
DESCRIPTION
0
1
0
0
Classic PCI Configuration Space
SCPS155C
63
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