Mobile Intel Pentium 4 Processor - M and Intel 845MP/MZ Chipset Platform Design Guide

Mobile Intel

Pentium

4 Processor-M and Intel

845MP/845MZ Chipset Platform

Design Guide 65

Figure 26. Control Signal to SCK/SCK# Trace Length Matching Requirements

SO-DIMM0

MCH-M

= Motherboard Trace

Lengths

SCS#[1:0],

SCKE[1:0]

SCK[2:0

]

SCK#[2:0]

Note: Lengths are measured from MCH-M pins to SO-DIMM0

connector pins.

(X - 3.0") < = (CNTRL Length) = <

( X - 1.0" )

SCK/SCK#[2:0] Length = X

SO-DIMM0 SO-DIMM1

MCH-M

= Motherboard Trace

Lengths

SCK[5:3]

SCK#[5:3]

(X - 3.0") < = (CNTRL Length) = <

(

X - 1.0"

)

SCK/SCK#[5:3] Length = X

Note: Lengths are measured from MCH-M pins to SO-DIMM1

connector pins.

SCS#[3:2],

SCKE

[

3:2

]

5.2.2.2. Control Routing Example

Figure 27 is an example of a board routing for the control signal group.