6402 datasheet(170/250 Pages) INTEL

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Registers

170

Intel® 6400/6402 Advanced Memory Buffer Datasheet

14.2.4

CCR: Class Code Register

This register contains the Class Code for the AMB, specifying the device function.

14.2.5

HDR: Header Type Register

This register identifies the header layout of the configuration space.

14.3

FBD Link Registers (Function 1)

14.3.1

FBD Link Control and Status

14.3.1.1

FBDS0: FBD Status 0

This register contains copies of status bits returned by the AMB in the most recent

northbound status frame when SYNC command R[1:0] field is 2’b00.

In the absence of SYNCs to this register, this register is not updated.

Device:

NodeID

Function: 0

Offset:

09h

Bit

Attr

Default

Description

23:16

05h

Base Class.

This field indicates the general device category. For the AMB, this field is hardwired

to 05h, indicating it is a “memory controller”.

15:8

00h

Sub-Class.

This field qualifies the Base Class, providing a more detailed specification of the

device function. For the AMB, this field is hardwired to 00h, indicating it is a “RAM”.

7:0

00h

This field identifies a specific programming interface (if any), that device

independent software can use to interact with the device. There are no such

interfaces defined for “memory controllers”.

Device:

NodeID

Function: 0

Offset:

0Eh

Bit

Attr

Default

Description

7RO

Multi-function Device.

Selects whether this is a multi-function device, that may have alternative

configuration layouts. The AMB has more than the 256 bytes of configuration

registers allotted to a single function. Therefore, the AMB is defined to be a

multifunction device, and this bit is hardwired to 1.

6:0

00h

Configuration Layout.

This field identifies the format of the 10h through 3Fh space. The AMB uses header

type “00”: these bits are hardwired to 00h.

Device:

NodeID

Function: 1

Offset:

40h

Bit

Att

Default

Description

7:5

Reserved

SP: Parity: This bit contains an odd parity bit that covers the S[3:0] field.

6402 Datasheet(PDF) 170 Page - Intel Corporation

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