Sdq/Sdqs Signal Package Lengths - Intel 855GME Design Manual

®
Intel 855GME Chipset and Intel
System Memory Design Guidelines (DDR-SDRAM)
Figure 68. SDQ/SDM to SDQS Trace Length Matching Diagram
GMCH Package
Note: All lengths are measured from GMCH die
pad to DIMM connector pad.
Note: Only one byte lane is shown for
reference. Each byte lane is matched
iIndependently.
GMCH Package
Note: All lengths are measured from GMCH die-
pad to DIMM connector pads.
5.4.4.5

SDQ/SDQS Signal Package Lengths

The package length data in
motherboard trace as required to achieve the overall length matching requirements defined in the
prior sections.
136
®
6300ESB ICH Embedded Platform Design Guide
SDQ[0]
SDQ[1]
SDQ[2]
SDQ[3]
855GME
SDQS[0]
Die
SDQ[4]
SDQ[5]
SDQ[6]
SDQ[7]
SDM[0]
SDQ[0]
SDQ[1]
SDQ[2]
SDQ[3]
855GME
SDQS[0]
Die
SDQ[4]
SDQ[5]
SDQ[6]
SDQ[7]
SDM[0]
Table 34 shall be used to tune the length of each SDQ, SDM, and SDQS
DIMM0
SDQ Length (Y) = (X ±25 mils)
SDQS Length = X
SDQ Length (Y) = (X ±25 mils)
SDM Length (Y) = (X ±25 mils)
DIMM0 DIMM1
SDQ Length (Y) =
(X +/-25 mils)
SDQS Length =
X
SDQ Length (Y) =
(X +/-25 mils)
SDM Length (Y) =
(X ±25 mils)