Dimm Dq/Dqs Split Termination Topology; Dimm Dq/Dqs Split Termination Topology Lengths - Intel 80331 Design Manual

Intel® 80331 I/O Processor Design Guide
Memory Controller
Table 38.

DIMM DQ/DQS Split Termination Topology Lengths

Traces Description
Microstrip/
TL1 Breakout
Stripline
TL2 Lead-in Microstrip
TL3 Microstrip
TL4 Vtt Microstrip
Figure 39.

DIMM DQ/DQS Split Termination Topology

80
Minimum Maximum
Layer
Length Length
0.5"
2 " 8"
0.25" 0.5"
0.15 0.5"
TL1 TL2
Trace
Spacing
Impedance
5 mils
45 ohms +/- 15%
or 12 mils
50 ohms +/- 15%
Same as TL2
5 mils
TL3
22 ohms +/- 5%
DIMM
Notes
Lead-in traces are preferred as
striplines.
Fan out for series termination
Split termination
2.5V
100 ohms
+/- 5%
TL4
100 ohms
+/- 5%
GND