January 2007
141
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
= SCS[3:2]# and SCKE[3:2] 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 the DIMM to the termination resistor.
depicts the
length matching requirements between the control signals and clock. A nominal CS/CKE package
length of 500 mils may be used to estimate baseline Mbyte lengths.
Figure 70. Control Signal to Clock Trace Length Matching Diagram
DIMM0
GMCH Package
SCS#[1:0]
SCKE[1:0]
SCK[2:0]
SCK#[2:0]
Note: All lengths are measured from GMCH
die pad to DIMM connector pads.
CTRL Length = Y0
Clock Ref. 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 pads.
SCS#[3:2]
SCKE[3:2]
CTRL Length = Y1
(X0 – 1.5" )
≤
Y0
≤
(X0 - 0.5")
(X1 – 1.5")
≤
Y1
≤
(X1- 0.5")
GMCH Package
855GME
Die
855GME
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...
