Memory Interface Routing Guidelines
68
Design Guide
6.1
DDR Overview
show both channels being routed to a single “bank” of eight DIMMs.
The DIMMs are physically interleaved. Intel recommends using this ordering, starting with
Channel B closest to the MCH, for optimal routing.
The platform requires DDR DIMMs to be populated in-order, starting with the 2 DIMMs furthest
from the MCH in a “fill-farthest” approach (see
and
). This recommendation
is based on the signal integrity requirements of the DDR interface. Intel’s recommendation is to
conduct this check for correct DIMM placement during BIOS initialization. Additionally, it is
strongly recommended that all designs follow the DIMM ordering, SMBus Addressing, Command
Clock routing and Chip Select routing documented in
. This addressing
must be maintained to be compliant with the reference BIOS code supplied by Intel. Designs with
fewer than 3 DIMMs should follow the pattern shown in
and
Figure 6-1. 4 DIMM per Channel Implementation
Figure 6-2. 3 DIMM per Channel Implementation
MCH
D
I
M
M
A4
03h
3/3#
6/7
D
I
M
M
B4
07h
3/3#
6/7
D
I
M
M
A3
02h
2/2#
4/5
D
I
M
M
B3
06h
2/2#
4/5
D
I
M
M
A2
01h
1/1#
2/3
D
I
M
M
B2
05h
1/1#
2/3
D
I
M
M
A1
00h
0/0#
0/1
D
I
M
M
B1
04h
0/0#
0/1
Fill Fourth
Fill Third
Fill Second
Fill First
SMBus Address:
Command Clock:
Chip Select:
MCH
D
I
M
M
A3
02h
2/2#
4/5
D
I
M
M
B3
06h
2/2#
4/5
D
I
M
M
A2
01h
1/1#
2/3
D
I
M
M
B2
05h
1/1#
2/3
D
I
M
M
A1
00h
0/0#
0/1
D
I
M
M
B1
04h
0/0#
0/1
Fill Third
Fill Second
Fill First
SMBus Address:
Command Clock:
Chip Select:
Содержание Xeon
Страница 24: ...Introduction 24 Design Guide This page is intentionally left blank ...
Страница 30: ...Component Quadrant Layout 30 Design Guide This page is intentionally left blank ...
Страница 34: ...Platform Stack Up and Component Placement Overview 34 Design Guide This page is intentionally left blank ...
Страница 52: ...Platform Clock Routing Guidelines 52 Design Guide This page is intentionally left blank ...
Страница 66: ...System Bus Routing Guidelines 66 Design Guide This page is intentionally left blank ...
Страница 118: ...Intel 82870P2 P64H2 118 Design Guide This page is intentionally left blank ...
Страница 146: ...I O Controller Hub 146 Design Guide This page is intentionally left blank ...
Страница 148: ...Debug Port 148 Design Guide This page is intentionally left blank ...
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