NH82810 S L7XK Intel, NH82810 S L7XK Datasheet - Page 47

• Manufacturer Part Number: NH82810 S L7XK
• Manufacturer: Intel

Specifications of NH82810 S L7XK

• Lead Free Status / RoHS Status: Compliant

3.4.21.
Datasheet
R
BUFF_SC—System Memory Buffer Strength Control Register
(Device 0)
Address Offset:
Default Value:
Access:
This register programs the system memory DRAM interface signal buffer strengths. The programming of
these bits should be based on DRAM density (x8, x16, or x32), DRAM technology (16Mb, 64Mb,
128Mb), rows populated, etc. Note that x4 DRAM and Registered DIMMs are not supported. DIMMs
with ECC are not supported. The BIOS, upon detection of ECC via SPD, should report to the user that
ECC DIMM timings are not supported by the GMCH.
The GMCH supports 2 DIMM slots with each slot supporting two rows of memory. Slots are numbered 0
through 1. Rows of Slots 0 are numbered 0 through 1. Rows of Slot 1 are numbed 2 through 3. The
DIMM’s SPD Byte 5 describes the number of sides in a DIMM; SPD Byte 13 provides information on
the DRAM width (x8, x16, or x32). BIOS uses these two SPD bytes to calculate loads on memory
signals. Load calculation is made based on populated memory rows.
For GMCH stepping with Revision ID ≥ 02, the default value of this register is FFFFh.The table below is
applicable for GMCH stepping with a Revision ID (Register 08h, Dev. 0) greater than 00h.
Bit
7
15
14
13
CKE1 Buffer Strength
Strength
SCS0#
Buffer
15
SCS0# Buffer Strength. This field sets the buffer strength for system memory chip buffer SCS0#.
0 = 3x: (6 to 8 loads)
1 = 2x: (2 to 4 loads)
load = (64 / SDRAM width for Row 0, if populated)
SCS1# Buffer Strength. This field sets the buffer strength for system memory chip buffer SCS1#.
0 = 3x: (6 to 8 loads)
1 = 2x: (2 to 4 loads)
load = (64 / SDRAM width for Row 1, if populated)
SCS2# Buffer Strength. This field sets the buffer strength for system memory chip buffer SCS2#.
0 = 3x: (6 to 8 loads)
1 = 2x: (2 to 4 loads)
load = (64 / SDRAM width for Row 2, if populated)
Strength
SCS1#
Buffer
14
6
5
CKE0 Buffer Strength
Strength
SCS2#
Buffer
13
92–93h
FFFFh
Read/Write
Strength
SCS3#
Buffer
12
4
Description
11
3
MD and DQM Buffer
SMAA[7:4] Buffer
Strength
Strength
10
2
9
1
Intel
SMAB[7:4] Buffer
Control Buffer
®
Strength
Strength
82810E (GMCH)
8
0
47