7.18 Capability ID and Next Item Pointer Registers

The capability ID and next item pointer register identifies the linked-list capability item and provides a pointer to the next capability item. See Table 7−15 for a complete description of the register contents.

Bit

15

 

14

13

 

12

11

10

 

9

8

7

6

 

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

 

 

 

 

Capability ID and next item pointer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

R

 

R

R

 

R

R

R

 

R

R

R

R

 

R

R

R

R

R

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

0

 

0

0

 

0

0

0

 

0

0

0

0

 

0

0

0

0

0

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Register:

Capability ID and next item pointer

 

 

 

 

 

 

 

 

 

 

Offset:

 

44h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type:

 

Read-only

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default:

 

0001h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 7−15. Capability ID and Next Item Pointer Registers Description

BIT

FIELD NAME

TYPE

DESCRIPTION

 

 

 

 

 

 

 

Next item pointer. The PCI7x21/PCI7x11 controller supports only one additional capability that is

15−8

NEXT_ITEM

R

communicated to the system through the extended capabilities list; therefore, this field returns 00h

 

 

 

when read.

 

 

 

 

7−0

CAPABILITY_ID

R

Capability identification. This field returns 01h when read, which is the unique ID assigned by the PCI

SIG for PCI power-management capability.

 

 

 

 

 

 

 

7−12

Page 172
Image 172
Texas Instruments PCI7411 Capability ID and Next Item Pointer Registers, Capability ID and next item pointer, Nextitem