Datasheet

154 Datasheet

3.11.9 HDR – Header Type Register (Device #2)

Address Offset: 0Eh

Default Value: 00h

Access: Read Only

Size: 8 bits

This register contains the Header Type of the IGD.

Bit Description

7 Multi Function Status (MFunc): Indicates if the device is a multi-function device.

6:0 Header Code (H): This is a 7-bit value that indicates the Header code for the IGD. This

code has the value 00h, indicating a type 0 configuration space format.

3.11.10 GMADR – Graphics Memory Range Address Register

(Device #2)

Address Offset: 10−13h

Default Value: 00000008h

Access: Read/Write, Read Only

Size: 32 bits

IGD graphics system memory base address is specified in this register.

Bit Description

31:27 Memory Base Address⎯R/W: Set by the OS, these bits correspond to address signals

[31:26].

26 128-MB Address Mask – RO: 0 indicates 128-MB address

25:4 Address Mask⎯RO: Indicates (at least) a 32-MB address range.

3 Prefetchable Memory⎯RO: Enable prefetching.

2:1 Memory Type⎯RO: Indicate 32-bit address.

0 Memory/IO Space⎯RO: Indicate system memory space.