![DevA:0x10](/images/new-backgrounds/24962/2496233x1.webp)
24888 Rev 3.03 - July 12, 2004 | |
AGP Device Graphic Virtual Memory Aperture Register | DevA:0x10 |
|
|
It is expected that the state of this register is copied into the host by software. This register controls no hard- ware in the IC.
Default: 0000 0000 0000 0008h | Attribute: See below. | |
Bits | Description |
|
|
| |
63:32 | APBARHI. | |
| programmed low; setting any of these bits high results in undefined behavior. Note: if | |
| DevA:0x10[64BIT]=0, then these bits are read only, all zero. | |
|
| |
31:22 | APBARLO. Aperture base address register low. These bits are a combination of | |
| only zero, based on the state of DevA:0xB4[APSIZE]; see that register for details. | |
|
|
|
21:4 | Reserved. |
|
3Read only. This bit is fixed at its default value to indicate that this register points prefetchable space.
264BIT:
1:0 | Read only. These bits are fixed at their default value to indicate that this register points memory space. | ||
AGP Device Subsystem ID and Subsystem Vendor ID Register | DevA:0x2C | ||
|
|
|
|
Default: 0000 0000h | Attribute: Read; write once. |
| |
Bits | Description |
|
|
|
|
| |
31:16 | Subsystem ID. This field controls no hardware. |
| |
|
|
| |
15:0 | Subsystem vendor ID. This field controls no hardware. |
| |
|
|
|
|
AGP Capabilities Pointer |
| DevA:0x34 | |
|
|
|
|
Default: 0000 00A0h | Attribute: Read only. |
| |
Bits | Description |
|
|
|
|
|
|
31:8 | Reserved. |
|
|
|
| ||
7:0 | Capabilities pointer. Specifies the offset in DevA:0 address space for the AGP capabilities block. | ||
|
|
|
|
17