845GL datasheet(87/193 Pages) INTEL

부품명	845GL

상세설명	Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)

PDF	193 Pages

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제조업체	INTEL [Intel Corporation]

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

3.5.2.17

MBASE1—Memory Base Address Register (Device 1)

Address Offset:

20–21h

Default Value:

FFF0h

Access:

R/W

Size:

16 bits

This register controls the processor to PCI_B non-prefetchable memory access routing based on

the following formula:

MEMORY_BASE

≤ address ≤ MEMORY_LIMIT

The upper 12 bits of the register are read/write and correspond to the upper 12 address bits

A[31:20] of the 32-bit address. The bottom four bits of this register are read only and return zeros

when read. This register must be initialized by the configuration software. For the purpose of

address decode, address bits A[19:0] are assumed to be 0. Thus, the bottom of the defined memory

address range will be aligned to a 1-MB boundary.

Bit

Description

15:4

Memory Address Base (MBASE).

This field corresponds to A[31:20] of the lower limit of the

memory range that will be passed by the Device 1 bridge to AGP/PCI_B.

3:0

Reserved.

845GL 데이터시트(PDF) 87 Page - Intel Corporation