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Technical Reference Guide
6.4 PROGRAMMING
The IGP’s integrated graphics processing unit is configured using PCI configuration registers
listed in Table 6-2.
Table 6-2. 815E-Based Graphics Controller PCI Configuration Registers
Table 6-2.
Graphics Processing Unit PCI Configuration Registers (Device 0, Function 0, Bus 1)
PCI
Config.
Addr.
Register
Reset
Value
PCI
Config.
Addr.
Register
Reset
Value
00, 01h Vendor ID 10DEh 2E, 2Fh Subsystem ID [2]
02, 03h Device ID [1] 30-33h Vid. BIOS Base Addr. [2]
04, 05h Command [2] 34h Capabilities Pointer [2]
06, 07h Status [2] 3Ch Interrupt Line [2]
08h Revision ID [2] 3Dh Interrupt Pin [2]
09-0Bh Class Code [2] 3Eh Min. Grant [2]
0Eh Header Type [2] 3Fh Max. Latency [2]
0Fh BIST [2] DC, DDh Pwr. Mgmt. Capabilities [2]
10-13h Memory Range Addr. [2] DE, DFh Pwr. Mgmt. Capabilites [2]
14-17h Mem. Map Range Addr. [2] E0, E1h Pwr. Mgmt. Control [2]
2C, 2Dh Subsys. Vendor ID [2] E2-FFh Reserved [2]
NOTE:
[1] D315, = 01A0h; d325, = 01F0h
[2] Refer to NVidia documentation for detailed register descriptions and values.
The GPU is controlled through memory-mapped registers by the appropriate software driver.
6.5 UPGRADING IGP-BASED GRAPHICS
The IGP-based graphics subsystem of these systems is upgradeable by installing an AGP graphics
card into the AGP slot. The upgrade procedure is as follows:
1. Shut down the system through the operating system.
2. Unplug the power cord from the rear of the system unit.
3. Remove the chassis cover.
4. Install the AGP card into the AGP slot.
5. Replace the chassis cover.
6. Reconnect the power cord to the system unit.
7. Power up the system unit.
The BIOS will detect the presence of the AGP card and disable the GPU of the IGP.
Compaq D315 and hp d325 Personal Computers
Featuring the AMD Athlon XP Processor
Second Edition - April 2003
6-5