845GL datasheet(108/193 Pages) INTEL

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Functional Description

108

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

4.2.3

Memory Organization and Configuration

In the following discussion the term “row” refers to a set of memory devices that are

simultaneously selected by a chip select signal. The GMCH supports a maximum of 4 rows of

memory. For the purposes of this discussion, a “side” of a DIMM is equivalent to a “row” of

SDRAM devices.

The memory bank address lines and the address lines allow the GMCH to support 64-bit wide x8

and x16 DIMMs using 64-Mb, 128-Mb, 256-Mb, and 512-Mb SDRAM technology.

For the DDR SDRAM interface, Table 4-2 lists the supported DDR DIMM configurations. Note

that the GMCH supports configurations defined in the JEDEC DDR DIMM specification only

(A,B,C). Non-JEDEC standard DIMMs (e.g., double-sided x16 DDR SDRAM DIMMs) are not

supported. For more information on DIMM configurations, refer to the JEDEC DDR DIMM

specification.

For the SDR SDRAM interface, Table 4-3 lists the supported SDR DIMM configurations.

Note: Mixed mode or uneven, double-sided SDR SDRAM DIMMs are not supported.

4.2.3.1

Configuration Mechanism for DIMMs

Detection of the type of SDRAM installed on the DIMM is supported via Serial Presence Detect

(SPD) mechanism as defined in the JEDEC DIMM specification. This uses the SCL, SDA, and

SA[2:0] pins on the DIMMs to detect the type and size of the installed DIMMs. No special

programmable modes are provided on the GMCH for detecting the size and type of memory

installed. Type and size detection must be done via the serial presence detection pins and is

required to configure the GMCH.

Table 4-2. Supported DDR DIMM Configurations

Density

64 Mbit

128 Mbit

256 Mbit

512 Mbit

Device

Width

X16

Single /

Double

SS/DS

184 pin

DDR

DIMMs

64 MB /

128 MB

32 MB /

128 MB /

256 MB

64 MB /

256 MB /

512 MB

128 MB /

512 MB /

1024 MB

256 MB/

Table 4-3. Supported SDR DIMM Configurations

Density

64 Mbit

128 Mbit

256 Mbit

512 Mbit

Device

Width

X16

Single /

Double

SS/DS

168 pin

SDR

DIMMs

64 MB /

128 MB

32 MB /

64 MB

128 MB /

256 MB

64 MB /

128 MB

256 MB /

512 MB

128 MB /

256 MB

512 MB /

1024 MB

256 MB /

512 MB

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