Intel 855GME Design Manual page 129

®
Intel 855GME Chipset and Intel
Figure 65. DDR Clock Trace Length Matching Diagram
Clock Reference Length X0 =
GMCH Package
Intel
855GME
Chipset
Die
Note: All lengths are measured from GMCH die
DIMM0 connector pads.
Clock Reference Length X1 =
GMCH Package
Intel
855GME
Chipset
Die
Note: All lengths are measured from GMCH die
DIMM1 connector pads.
®
System Memory Design Guidelines (DDR-SDRAM)
_______
_ _
AB2 SCK0
® AA2 SCK#0
AC26 SCK1
SCK#1
AB25
SCK2
AC3
SCK#2
AD4
__________
AC2
®
AD2
AB23
AB24
AA3
AB4
- pad to
January 2007
6300ESB ICH Embedded Platform Design Guide
DIMM0
SCK0 Length = X0
SCK#0 Length = X0
SCK1 Length = X0
SCK#1 Length = X0
SCK2 Length = X0
SCK#2 Length = X0
Length = X0 ± 25 mils
(SCK to SCK# length ±10 mils)
-pad to
DIMM DIMM
0 1
SCK3
SCK3#
SCK4
SCK4#
SCK5
SCK#5
SCK3 Length = X1
SCK#3 Length = X1
SCK4 Length = X1
SCK#4 Length = X1
SCK5 Length = X1
SCK#5 Length = X1
Length = X1 ±25 mils
(SCK to SCK# length ±10 mils)
129