D2S

D2_Support

10

 

The LSI53C875A sets this bit to indicate support for

 

power management state D2.

 

D1S

D1_Support

9

 

The LSI53C875A sets this bit to indicate support for

 

power management state D1.

 

R

Reserved

[8:6]

DSI

Device Specific Initialization

5

 

This bit is cleared to indicate that the LSI53C875A

 

 

requires no special initialization before the generic class

 

device driver is able to use it.

 

APS

Auxiliary Power Source

4

 

Because the LSI53C875A does not provide a PME

 

 

signal, this bit is cleared, indicating that no auxiliary

 

 

power source is required to support the PME signal in the

 

D3cold power management state.

 

PMEC

PME Clock

3

 

Bit 3 is cleared because the LSI53C875A does not

 

 

provide a PME pin.

 

VER[2:0]

Version

[2:0]

 

These three bits are set to 010 to indicate that the

 

 

LSI53C875A complies with Revision 1.1 of the PCI Power

 

Management Interface Specification.

 

Registers: 0x44–0x45

Power Management Control/Status (PMCSR)

Read/Write

15

14

13

12

9

8

7

 

 

 

 

2

1

0

 

PST

DSCL

 

DSLT

PEN

 

 

 

R

 

 

PWS[1:0]

 

0

0

0

0

0

0

0

0

x

x

x

x

x

x

0

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PST

 

 

 

PME Status

 

 

 

 

 

 

 

 

15

 

 

 

 

 

The LSI53C875A always returns a zero for this bit,

 

 

 

 

 

 

indicating that PME signal generation is not supported

 

 

 

 

 

from D3cold.

 

 

 

 

 

 

 

 

 

4-16Registers

Page 108
Image 108
LSI 53C875A technical manual D2S, D1S, Dsi, Aps, Pmec, Pst