82845MP Datasheet, PDF (76/157 Pages) Intel Corporation – Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)

Intel^®82845MP/82845MZ Chipset-Mobile (MCH-M)
R
3.7.30. ATTBASE – Aperture Translation Table Base Register – Device
#0
Address Offset:
Default Value:
Access:
Size:
B8-BBh
0000_0000h
Read/Write, Read Only
32 bits
This register provides the starting address of the Graphics Aperture Translation Table Base located in the
main DRAM. This value is used by the MCH-M Graphics Aperture address translation logic (including
the GTLB logic) to obtain the appropriate address translation entry required during the translation of the
aperture address into a corresponding physical DRAM address. The ATTBASE register may be
dynamically changed.
Note: The address provided via ATTBASE is 4-KB aligned.
Bit
31:12
11:0
Description
Aperture Translation Table Base (TTABLE): This field contains a pointer to the base of the
translation table used to map memory space addresses in the aperture range to addresses in main
memory.
NOTE: It should be modified only when the GTLB has been disabled.
Reserved
76
Datasheet
250687-002