910GL datasheet(96/426 Pages) INTEL

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MCHBAR Registers

Datasheet

Address

Offset

Symbol

Default

Value

Access

195–19Fh

—

Reserved

—

1A0–1A3h

C1DRC0

Channel B DRAM Controller Mode 0

00000000h

R/W, RO

1A4–F0Fh

—

Reserved

—

F10–F13h

PMCFG

Power Management Configuration

00000000h

R/W

F14h

PMSTS

Power Management Status

00000000h

R/W/C/S

5.1

MCHBAR Register Details

5.1.1

C0DRB0—Channel A DRAM Rank Boundary Address 0

MMIO Range:

MCHBAR

Address Offset:

100h

Default Value:

00h

Access:

R/W

Size:

8 bits

The DRAM Rank Boundary Register defines the upper boundary address of each DRAM rank

with a granularity of 32 MB. Each rank has its own single-byte DRB register. These registers are

used to determine which chip select will be active for a given address.

Channel and Rank Map:

Channel A Rank 0:

100h

Channel A Rank 1:

101h

Channel A Rank 2:

102h

Channel A Rank 3:

103h

Channel B Rank 0:

180h

Channel B Rank 1:

181h

Channel B Rank 2:

182h

Channel B Rank 3:

183h

Single Channel or Asymmetric Channels Example

If the channels are independent, addresses in Channel B should begin where addresses in Channel

A left off, and the address of the first rank of Channel A can be calculated from the technology

(256 Mbit, 512 Mbit, or 1 Gbit) and the x8 or x16 configuration. With independent channels, a

value of 01h in C0DRB0 indicates that 32 MB of DRAM has been populated in the first rank, and

the top address in that rank is 32 MB.

910GL 데이터시트(PDF) 96 Page - Intel Corporation

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