Figure 77. Control Signal To Sck/Sck# Trace Length Matching Requirements - Intel 855PM Design Manual

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Figure 77. Control Signal to SCK/SCK# Trace Length Matching Requirements

Intel 855PM
MCH Package
Note: Lengths are measured from MCH-M pins to SO-
DIMM0 connector pads.
Intel 855PM
MCH Package
Note: Lengths are measured from MCH-M pins to SO-
DIMM1 connector pads.
®
Intel 855PM Chipset Platform Design Guide
= Motherboard Trace
Lengths
SCS#[1:0],
SCKE[1:0]
SCK[2:0]
SCK#[2:0]
= Motherboard Trace
Lengths
SCS#[3:2],
SCKE[3:2]
SCK[5:3]
SCK#[5:3]
System Memory Design Guidelines (DDR-SDRAM)
SO-DIMM0
CNTRL Length = Y
( Y - 1.0" ) < = X < = ( Y + 0.5" )
SCK/SCK#[2:0] Length = X
SO-DIMM0 SO-DIMM1
CNTRL Length = Y
( Y - 1.0" ) < = X < = ( Y + 0.5" )
SCK/SCK#[5:3] Length = X
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