Guide

System Memory Design Guidelines (DDR-SDRAM)
R
Intel
®
852GM Chipset Platform Design Guide 97
Figure 48. SDQ/SDM to SDQS Trace Length Matching Diagram
SO-DIMM0
GMCH Package
Note: All lengths are measured from GMCH die
pad to SO-DIMM connector pad.
SDQ[0]
SDQ[1]
SDQ[2]
SDQ[3]
SDQS[0]
SDQ[4]
SDQ[5]
SDQ[6]
SDQ[7]
SDQ Length (Y) = (X ±25 mils)
SDQ Length (Y) = (X ±25 mils)
SDQS Length = X
SO-DIMM0 SO-DIMM1
GMCH Package
SDQ[0]
SDQ[1]
SDQ[2]
SDQ[3]
SDQS[0]
SDQ[4]
SDQ[5]
SDQ[6]
SDQ[7]
SDQ Length (Y) =
(X +/-25 mils)
SDQ Length (Y) =
(X +/-25 mils)
SDQS Length = X
Note: All lengths are measured from GMCH die-
pad to SO-DIMM connector pads.
GMCH
Die
GMCH
Die
SDM[0]
SDM Length (Y) = (X ±25 mils)
SDM Length (Y) =
(X ±25 mils)
SDM[0]
Note: Only one byte lane is shown for
reference. Each byte lane is matched
independently.