12.17 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 12−12 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:

 

80h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type:

 

Read-only

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default:

 

0001h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 12−12. Capability ID and Next Item Pointer Registers Description

BIT

FIELD NAME

TYPE

DESCRIPTION

 

 

 

 

15−8

NEXT_ITEM

R

Next item pointer. The SD host controller supports only one additional capability, PCI power

 

 

 

management, that is 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.

 

 

 

 

12−11

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Texas Instruments PCI7611, PCI7411, PCI7621, PCI7421 manual Capability ID and Next Item Pointer Registers, 12−11