Table of Contents
Advertisement
System Memory Design Guidelines (DDR-SDRAM)
Figure 86. SCK/SCK# Trace Length Matching Requirements
Intel 855PM
MCH Package
Note: Lengths are measured from MCH-M pin to SO-
DIMM0 connector pads.
Intel 855PM
MCH Package
Note: Lengths are measured from MCH-M pin to SO-
DIMM1 connector pads.
152
= Motherboard Trace Lengths
SCK0
SCK#0
SCK1
SCK#1
SCK2
SCK#2
= Motherboard Trace Lengths
SCK3
SCK#3
SCK4
SCK#4
SCK5
SCK#5
SO-DIMM0
SCK0 Length = X
SCK#0 Length = X
|X
- X
| <= 0.01 inches
0
0#
SCK1 Length = X
SCK#1 Length = X
|X
- X
| <= 0.01 inches
1
1#
SCK2 Length = X
SCK#2 Length = X
|X
- X
| <= 0.01 inches
2
2#
SO-DIMM0 SO-DIMM1
®
Intel
855PM Chipset Platform Design Guide
R
0
0#
1
1#
2
2#
SCK3 Length = Y
0
SCK#3 Length = Y
0#
|Y
- Y
| <= 0.01 inches
0
0#
SCK4 Length = Y
1
SCK#4 Length = Y
1#
|Y
- Y
| <= 0.01 inches
1
1#
SCK5 Length = Y
2
SCK#5 Length = Y
2#
|Y
- Y
| <= 0.01 inches
2
2#
Advertisement
Table of Contents
