156
Intel
82865G/82865GV GMCH Datasheet
Functional Description
5.2.5
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 four 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 128-Mb, 256-Mb, and 512-Mb SDRAM technology.
For the DDR SDRAM interface,
Table 25
lists the supported 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
additional information on DIMM configurations, refer to the
JEDEC DDR DIMM specification
.
Table 24. RAM Address Translation (Dual-Channel Mode, Internal Gfx)
(Dynamic Mode)
Tech. Config.
Row
size
Page
size
Row / Column
/ Bank
Addr BA1 BA0 A12 A11 A10 A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
128Mb 8Mx16
64MB
12x9x2
Row
25
18
13
16
14
26
28
27
23
22
21
25
24
15
17
4KB
Col
18
13
AP
12
11
10
9
8
7
6
5
3
128Mb 16Mx8
128MB
12x10x2
Row
26
14
18
16
27
26
25
24
23
22
21
29
28
15
17
8KB
Col
14
18
AP
13
12
11
10
9
8
7
6
5
3
256Mb 16Mx16
128MB
13x9x2
Row
26
18
13
27
16
14
26
25
24
23
22
21
29
28
15
17
4KB
Col
18
13
AP
12
11
10
9
8
7
6
5
3
256Mb 32Mx8
256MB
13x10x2
Row
27
14
18
28
16
27
26
25
24
23
22
21
30
29
15
17
8KB
Col
14
18
AP
13
12
11
10
9
8
7
6
5
3
512Mb 32Mx16
256MB
13x10x2
Row
27
14
18
28
16
27
26
25
24
23
22
21
30
29
15
17
8KB
Col
14
18
AP
13
12
11
10
9
8
7
6
5
3
512Mb 64Mx8
512MB
13x11x2
Row
28
18
15
28
29
27
26
31
30
23
22
21
25
24
16
17
16KB
Col
18
15
14
AP
13
12
11
10
9
8
7
6
5
3
Table 25. Supported DDR DIMM Configurations
Density
128 Mbit
256 Mbit
512 Mbit
Device Width
x8
x16
x8
x16
x8
x16
Single / Double
SS/DS
SS/DS
SS/DS
SS/DS
SS/DS
SS/DS
184 pin DDR DIMMs
128/256 MB
64 MB/NA
256/512 MB
128 MB/NA
512/1024 MB
256 MB/NA