January 2007
149
Intel
®
855GME Chipset and Intel
®
6300ESB ICH Embedded Platform Design Guide
System Memory Design Guidelines (DDR-SDRAM)
Length range formula for DIMM1:
X
1
= SCK[5:3]/SCK[5:3]# total reference length, including package length. Refer to
for more information.
Y
1
= SMAB[5,4,2,1] total length = GMCH Package L1, as shown in
, where:
(X
1
– 1.5”)
≤
Y
1
≤
(X
1
- 0.5”)
No length matching is required from DIMM1 to the termination resistor.
depicts the
length matching requirements between the CPC signals and clock. A nominal CPC package length
of 500 mils may be used to estimate baseline Mbyte lengths.
Figure 74. CPC Signals to Clock Length Matching Diagram
DIMM0
GMCH Package
SMA[5,4,2,1]
SCK[2:0]
SCK#[2:0]
Note: All lengths are measured from GMCH
die pad to DIMM connector pad.
CPC Length = Y0
Clock Reference Length = X0
DIMM0
DIMM1
SCK[5:3]
SCK#[5:3]
Clock Ref Length = X1
Note: All lengths are measured from GMCH
die pad to DIMM connector pad.
SMAB[5,4,2,1]
CPC Length = Y1
(X0 – 1.5") <= Y0 <= (X0 - 0.5")
(X1–1.5") <= Y1 <= (X1-0.5")
GMCH Package
855GME
GMCH
Die
855GME
GMCH
Die
Summary of Contents for 6300ESB ICH
Page 24: ...24 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Introduction...
Page 102: ...102 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide...
Page 122: ...122 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide...
Page 190: ...190 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Hub Interface...
Page 318: ...318 Intel 855GME Chipset and Intel 6300ESB ICH Embedded Platform Design Guide Layout Checklist...
