12.10 Subsystem Identification Register

The subsystem identification register, used for system and option card identification purposes, may be required for certain operating systems. This read-only register is initialized through the EEPROM and can be written through the subsystem access register at PCI offset 8Ch (see Section 12.23). All bits in this register are reset by GRST only.

Bit

15

 

14

13

 

12

 

11

10

 

9

8

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

 

 

 

 

 

 

Subsystem identification

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

RU

 

RU

RU

 

RU

 

RU

RU

 

RU

RU

RU

RU

RU

RU

RU

RU

RU

RU

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

0

 

0

0

 

0

 

0

0

 

0

0

0

0

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Register:

Subsystem identification

 

 

 

 

 

 

 

 

 

 

 

Offset:

 

2Eh

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type:

 

Read/Update

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default:

0000h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12.11 Capabilities Pointer Register

The power management capabilities pointer register provides a pointer into the PCI configuration header where the power-management register block resides. Since the PCI power management registers begin at 80h, this read-only register is hardwired to 80h.

Bit

 

7

6

 

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

 

Capabilities pointer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

 

R

R

 

R

R

R

R

R

R

 

 

 

 

 

 

 

 

 

 

 

Default

 

1

0

 

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

 

 

 

Register:

Capabilities pointer

 

 

 

 

 

 

 

Offset:

34h

 

 

 

 

 

 

 

 

Type:

Read-only

 

 

 

 

 

 

 

 

Default:

80h

 

 

 

 

 

 

12.12

Interrupt Line Register

 

 

 

 

 

 

The interrupt line register is programmed by the system and indicates to the software which interrupt line the SD host controller has assigned to it. The default value of this register is FFh, indicating that an interrupt line has not yet been assigned to the function.

Bit

7

6

5

4

 

3

2

1

0

 

 

 

 

 

 

 

 

 

 

Name

 

 

 

 

Interrupt line

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

RW

RW

RW

RW

 

RW

RW

RW

RW

 

 

 

 

 

 

 

 

 

 

Default

1

1

1

1

 

1

1

1

1

 

 

 

 

 

 

 

 

 

 

Register: Interrupt line

Offset: 3Ch

Type: Read/Write

Default: FFh

12−8

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Image 262
Texas Instruments PCI7621, PCI7411, PCI7611, PCI7421 manual Interrupt Line Register, 12−8