Ddr Ii 400 Dimm Dqs Lengths; Ddr Ii 400 Dimm Dq Lengths; Ddr Ii 400 Dimm Dq Topology - Intel 80331 Design Manual

Intel® 80331 I/O Processor Design Guide
Memory Controller
Table 59.

DDR II 400 DIMM DQ Lengths

Traces Description
TL0 Breakout
TL1 Lead-in
Figure 50.

DDR II 400 DIMM DQ Topology

Table 60.

DDR II 400 DIMM DQS Lengths

Traces Description
TL0 Breakout
TL1 Lead-in
Figure 51. DDR II 400 DIMM DQS Topology
106
Minimum Maximum
Layer
Length Length
Microstrip 0" 0.5"
Microstrip 2 " 8"
Minimum Maximum
Layer
Length Length
Microstrip 0" 0.5"
Microstrip 2 " 8"
Spacing
Trace
(edge to
Impedance
edge)
5 mils
Same
group 12
mils
45 ohms or 50
ohms
Other
groups
20 mils
TL0 TL1
Spacing
Trace
(edge to
Impedance
edge)
5 mils
20 mils
Differential 100 from
ohm impedance other
signals
TL0 TL1
Notes
5 mils trace width OK for
breakout.
DIMM
Notes
5 mils trace width OK for
breakout.
Route as differential pair.
• Motherboard 100 ohm
differential constructed by
stripline of two 4 mil traces
separated by center to
center distance of 12 mils.
• Add-in card 100 ohm
differential constructed by
stripline of two 5 mil traces
separated by center to
center distance of 12 mils.