845GL datasheet(186/193 Pages) INTEL

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Intel® 82845G/82845GL/82845GV GMCH Datasheet

186

Intel® 82845GL/82845GV GMCH

CAPREG—Capability Identification Register (Device 0)

Address Offset

E4h–E8h

Default Value

0x_x105_A009h

Access

Size:

40 bits

9.4.2

Host-to-AGP Bridge Registers (Device 1)

Device 1 does not exist on the 82845GL/82845GV components. The Device 1 registers described

in Chapter 3. are not in the 82845GL/82845GV. For the 82845GL/82845GV, these register address

locations are Intel Reserved.

9.5

Synchronous Display Differences

The synchronous display is different between the 82845G and 82845GL\82845GV. For the

82845GL\82845GV, replace Section 4.5.2.2, Synchronous Display with the following:

Synchronous Display

Microsoft Windows 98 and Windows 2000 have enabled support for multi-monitor display.

Synchronous mode will display the same information on multiple displays.

Since the GMCH has several display ports available for its single pipe, it can support synchronous

display on two displays unless one of the displays is a TV. No synchronous display is available

when a TV is in use. The GMCH does not support two synchronous digital displays. The GMCH

cannot drive multiple displays concurrently (different data or timings). Since the GMCH does not

support AGP, it is incapable of operating in parallel with an external AGP device. The GMCH can,

however, work in conjunction with a PCI graphics adapter.

9.6

Intel® 82845GL\82845GV GMCH Ballout

Table 9-1 provides the 82845GL\82845GV ballout arranged alphabetically by signal name. The

differences between the ballout list in this chapter and the ballout list in Chapter 7 is that the AGP

signals have been replaced with their corresponding DVO signal names. Since not all 82845G AGP

signals are multiplexed, the remaining non-multiplexed 82845G AGP signal ballouts are shown in

Table 9-1 as No Connect (NC).

Bits

Description

15:8

Next_Pointer.

This field has the value A0h pointing to the next capabilities register, AGP

Capability Identifier Register (ACAPID). Since AGP is disabled (IGDIS = 0), this becomes the last

pointer in the device, and it is set to 00h signifying the end of the capabilities linked list.

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