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Figure 59.
Single Channel Source Synchronous Topology DIMM Solution
MCH
NOTE: Indicated lengths measure from the MCH component die pad (PCB trace velocity equivalent, see
Section 12.6, "Length
Figure 60.
Trace Length Matching Requirements for Single Channel Source Synchronous
Routing
NOTES:
1. The DIMM displayed represents any DIMM. The two strobes must be within the same tolerance.
2. All DIMMs must be length matched to the MCH within the specified tolerance. The recommended
method to do this is to length match the DIMM to DIMM signals, then length match the MCH to the first
DIMM within the specified tolerance.
3. There are eight Data lines (DQ) per group. For simplicity, only the longest and the shortest are represented
here.
4. Indicated lengths measure from the MCH die pad to the DIMM connector pin (including the series resistor).
Section 12.6, "Length Tuning"
5. Rs only applies to the first DIMM in each channel.
Design Guide
®
Intel
Pentium
DQ/CB Data Group
Channel A
Associated DQS
MCH to DIMM1
Tuning") to the DIMM connector pin (including the series resistor).
MCH
Shortest Data (DQ) = Y – 25 mils
describes how to calculate the correct tuned lengths.
®
M Processor and Intel
Memory Interface Routing Guidelines
Rs
Rs
Rs to
DIMM to
DIMM1
DIMM
DIMMs
Shortest Strobe (DQS) = X
®
E7501 Chipset Platform
DDR VTERM
(1.25V)
Rtt
Rtt
DIMM
to Rtt
any DIMM
Rs
Rs
Rs
Rs
99
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