Register: 0x40

Capability ID

Read Only

7

0

CID

0

0

0

0

0

0

0

1

CIDCap_ID[7:0]

This register indicates the type of data structure currently being used. It is set to 0x01, indicating the Power Management Data Structure.

Register: 0x41

Next Item Pointer

Read Only

7

0

NIP

0

0

0

0

0

0

0

0

NIPNext_Item_Ptr[7:0]

Bits [7:0] contain the offset location of the next item in the controller’s capabilities list. The LSI53C875A has these bits set to zero indicating no further extended capabilities registers exist.

Registers: 0x42–0x43

Power Management Capabilities (PMC)

Read Only

15

 

 

 

11

10

9

 

8

 

6

5

4

3

2

0

 

 

PMES

 

D2S

D1S

 

 

R

 

DSI

APS

PMEC

 

VER[2:0]

 

0

0

0

0

0

1

1

 

x

x

x

0

0

0

0

 

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PMES

PME_Support

 

 

 

 

 

 

 

[15:11]

Bits [15:11] define the power management states in which the LSI53C875A will assert the PME pin. These bits are all set to zero because the LSI53C875A does not provide a PME signal.

PCI Configuration Registers

4-15

Page 107
Image 107
LSI 53C875A technical manual Pmes