January 2007
305
Intel
®
855GME Chipset and Intel
®
6300ESB ICH Embedded Platform Design Guide
Layout Checklist
COMP[0,2]
•
Terminate each signal to ground with 27.4
Ω
±1% resistors.
•
Connect each to CPU with a Zo = 27.4
Ω
trace that is less than 0.5 inches from the
pin.
•
Spacing from other switching signal traces
should be a minimum of 25 mils.
•
Refer to
for
detailed layout recommendations.
COMP[1,3]
•
Terminate each signal to ground with 54.9
Ω
±1% resistors.
•
Connect each to CPU with a Zo = 55
Ω
trace
that is less than 0.5 inches from the pin.
•
Spacing from other switching signal traces
should be a minimum of 25 mils.
•
Refer to
for
detailed layout recommendations.
Processor Power and GND Measurement/Sense Signals
VCCSENSE
VSSSENSE
•
Route traces of equal length using 3:1
spacing, Zo = 55
Ω
± 15%.
•
Place via next to the processor socket’s pin
for measurement of CPU_VCC/VSS.
•
Place a ground via 100 mils from each test
point via.
•
All other signals shall be a minimum of 25
mils (preferably 50 mils) from VCCSENSE
and VSSSENSE routing.
•
Refer to
for more
information.
Processor Decoupling, VREF, and Filtering
GTLREF
•
Connect CPU GTLREF pin to a 1 K
Ω
± 1%
and 2 K
Ω
± 1% resistive divider to VCCP.
•
No decoupling on this signal.
•
Connect voltage divider node to CPU
GTLREF pin with a Zo = 55
Ω
trace that is
shorter than 0.5 inches
•
Minimum separation from other switching
signals should be 25 mils.
•
Refer to
for more
information.
Table 148. Processor Layout Checklist (Sheet 6 of 7)
Checklist Items
Recommendations
Comments
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...
