XIO2000 datasheet(112/150 Pages) TI

112 / 150 page

PCI Express Extended Configuration Space

100

November 2005

SCPS097B

5.16 Next Capability Offset/Capability Version Register

This read-only register returns the value 000h to indicate that this extended capability block represents the

end of the linked list of extended capability structures. The four least significant bits identify the revision of the

current capability block as 1h.

PCI Express extended register offset:

152h

Read-only

Default value:

0001h

BIT NUMBER

RESET STATE

5.17 Port VC Capability Register 1

The first port VC capability register provides information to software regarding the VC capabilities support by

the bridge. See Table 5−13 for a complete description of the register contents.

PCI Express extended register offset:

154h

Read-only

Default value:

0000 08X1h

BIT NUMBER

RESET STATE

BIT NUMBER

RESET STATE

Table 5−13. Port VC Capability Register 1 Description

BIT

FIELD NAME

ACCESS

DESCRIPTION

31:12

RSVD

Reserved. Returns 00000h when read.

11:10

PORT_TABLE_SIZE

Port arbitration table entry size. This read-only field returns a value of 10b to indicate

that the field size within the port arbitration table is four bits. This is necessary to allow

as many as six secondary PCI bus masters.

9:8

REF_CLK

Reference clock. This read-only field returns a value of 00b to indicate than an internal

100-ns timer is used for time-based, WRR port arbitration.

RSVD

Reserved. Returns 0b when read.

6:4

LOW_PRIORITY_COUNT

Low priority extended VC count. When bit 25 (STRICT_PRIORITY_EN) in the general

control register (offset D4h, see Section 4.65) is 0b, the default

LOW_PRIORITY_COUNT is 001b. When STRICT_PRIORITY_EN is 1b, the default

LOW_PRIORITY_COUNT is 000b. When STRICT_PRIORITY_EN is set, strict priority

VC arbitration is used and the extended VC always receives priority over VC0 at the

PCI Express port.

RSVD

Reserved. Returns 0b when read.

2:0

EXT_VC_COUNT

Extended VC count. This read-only field returns a value of 001b to indicate support for

one extended VC.

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