AM79C975VCW datasheet(122/304 Pages) AMD

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122

Am79C973/Am79C975

P R E L I M INARY

Read/write accessible always.

Sticky bit. This bit is reset by

POR. H_RESET, S_RESET, or

setting the STOP bit has no ef-

fect.

14-13 DATA_SCALE

Data Scale. This two bit read-

only field indicates the scaling

factor to be used when interpret-

ing the value of the Data register.

The value and meaning of this

field will vary depending on the

DATA_SCALE field.

Read only.

12-9

DATA_SEL Data Select. This optional four-bit

field is used to select which data

is reported through the Data reg-

ister and DATA_SCALE field.

Read/write accessible always.

Sticky bit. This bit is reset by

POR. H_RESET, S_RESET, or

setting the STOP bit has no ef-

fect.

PME_EN

PME

Enable.

When

PME_EN enables the function to

assert PME. When a 0, PME as-

sertion is disabled.

This bit defaults to “0” if the func-

tion does not support PME gener-

ation from D3cold.

If the function supports PME from

D3cold, then this bit is sticky and

must be explicitly cleared by the

operating system each time the

operating system is initially load-

ed.

Read/write accessible always.

Sticky bit. This bit is reset by

POR. H_RESET, S_RESET, or

setting the STOP bit has no ef-

fect.

7-2

RES

Reserved locations. Read only.

1-0

PWR_STATE Power State. This 2-bit field is

used both to determine the cur-

rent power state of a function and

to set the function into a new

power state. The definition of the

field values is given below.

00b - D0.

01b - D1.

10b - D2.

11b - D3.

These bits can be written and

read, but their contents have no

effect on the operation of the de-

vice.

Read/write accessible always.

PCI PMCSR Bridge Support Extensions Register

Offset 46h

Bit

Name

Description

7-0

PMCSR_BSE The PCI PMCSR Bridge Support

Extensions Register is an 8-bit

Extensions are not supported.

This register has a default value

of 00h.

The PCI PMCSR Bridge Support

Extensions register is located at

offset 46h in the PCI Configura-

tion Space. It is read only.

PCI Data Register

Offset 47h

Note: All bits of this register are loaded from EE-

PROM. The register is aliased to lower bytes of the

BCR37-44 for testing purposes.

Bit

Name

Description

7-0

DATA_REG The PCI Data Register is an 8-bit

Power

Management

Interface

Specification” version 1.1 for a

more detailed description of this

The PCI DATA register is located

at offset 47h in the PCI Configu-

ration Space. It is read only.

RAP Register

The RAP (Register Address Pointer) register is used to

gain access to CSR and BCR registers on board the

Am79C973/Am79C975 controller. The RAP contains

the address of a CSR or BCR.

As an example of RAP use, consider a read access to

CSR4. In order to access this register, it is necessary

to first load the value 0004h into the RAP by performing

a write access to the RAP offset of 12h (12h when WIO

mode has been selected, 14h when DWIO mode has

AM79C975VCW Datasheet(PDF) 122 Page - Advanced Micro Devices

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