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Motherboard Layout and Routing Guidelines
2.3.4
Dual Processor Systems
2.3.4.1
Dual Processor Network Topology and Conditions
Figure 2-9. Recommended Topology for Dual Processor Design
2.3.4.2
Dual Processor Recommended Trace Lengths
The recommended trace lengths for dual processor designs are summarized in
simulations have shown that it is desirable to control the amount of imbalance in the network to
meet ringback specifications at the Intel
drives. This control is reflected in the recommendations of
Table 2-2. Recommended Trace Lengths for Dual Processor Designs
Trace
L3
1
L4
2
L5
NOTES:
1. L4 & L5 are interchangeable
2. It is possible to find working solutions outside the recommendations of
show. Intel strongly recommends that any traces that fall outside the recommended lengths be simulated to
ensure they meeting timing and signal quality specs.
2.3.5
Single Processor Systems—Single-End Termination (SET)
2.3.5.1
Set Network Topology and Conditions
Removal of the termination resistors from the system board can reduce system cost, at the expense
of increased ringing and reduced solution space. Intel has simulated this topology, known as single
end termination (SET), and found that it can work. However, the topology has some limitations
which are discussed below.
2-8
L4
Minimum Length
0.50"
1.50"
L4 - 1.00", but L4+L5 must be at least 4.00"
®
Intel
440GX
AGPset
L3
L5
®
®
Pentium
II processor when the Intel
Table
2-2.
L4 + 1.00", but not greater than 5.00"
Intel
Table
2-2. Intel's
®
440GX AGPset
2
Maximum Length
1.50"
4.00"
Table
2-2, as the solution space plot
®
440GX AGPset Design Guide
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