Intel Pentium 4 Processor 478-Pin Socket (mPGA478) Design Guidelines

Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478)
R
18
Package
hld
Package pin
Motherboard
Socket contact
package
Shorting bar
+V
+I
-V
-I
Figure 4-1. Methodology for Measuring Total Electrical Resistance
Motherboard
package
Shorting bar
+V
+I
-V
-I
Figure 4-2. Methodology for Measuring Electrical Resistance of the Jumper
Four types of jumpers (Type A, B1, B2 and PJRC) are used in the Package test vehicle (PTV) and are shown
in Figure 4-3 (
below). The mean of Rjumper is therefore different for each type in the calculation of the
single pin resistance (See below for calculating single pin resistance).