Intel EP80579 Guide

Intel
®
EP80579 Integrated Processor Product Line—High-Speed Design Concerns
Intel
®
EP80579 Integrated Processor Product Line
Platform Design Guide May 2010
54 Order Number: 320068-005US
When the strobes are the furthest apart (that is, as far apart as allowed for signals of
the same group), then their difference is the total allowed tolerance. This means that
all signals must fall between them, or have a solution space, which is “tolerance” wide.
Longer_Strobe
Flight Time
= Shorter_Strobe
Flight Time
+ Tolerance
Shorter_Strobe
Flight Time
= Longer_Strobe
Flight Time
– Tolerance
When the strobes have exactly the same flight time, then the signals have a solution
space which is 2*tolerance wide.
Strobe
Flight Time
= Longer_Strobe
Flight Time
= Shorter_Strobe
Flight Time
Minimum_Signal
Flight Time
= Strobe
Flight Time
– Tolerance
Maximum_Signal
Flight Time
= Strobe
Flight Time
+ Tolerance
5.6.2 Flight Time Segment Analysis
Length matching often requires package compensating for differences in the package
trace lengths of signals within the same strobe group. The “package trace length” is
defined as the trace segment between the die pad and component package pin. To
Figure 28. Signal Length Solution Space with Furthest Apart Strobes
Shorter_Strobe
Fl i ght Time
tolerance
Longer_Strobe
Fli ght Ti m e
Minimum_
Signal
Flight Time
Maximum_
Signal
Fl igh t Tim e
Figure 29. Signal Length Solution Space with Matched Strobes
Minimum_
Signal
Fl ight Tim e
2*tolerance
Maximum_
Signal
Fl igh t Tim e
Shor ter_
Str obe
Flight T im e
Long er _
Str obe
Flight T im e
Shorter_
Strobe
Fl i ght Ti me
+ Tolerance
Longer_
St robe
Fl igh t Tim e
– Tolerance

Intel EP80579 Specifications

General

Brand	Intel
Model	EP80579
Category	Computer Hardware
Language	English