Example Of Test Bead On A Stub (Not Preferred); Example Of Differential Test Bead With Matched Placement; Bead Parameters - Intel Quark SoC X1000 Design Manual

Figure 86.

Example of Test Bead on a Stub (Not Preferred)

Figure 87.

Example of Differential Test Bead with Matched Placement

Table 63. Bead Parameters (Sheet 1 of 2)
Test Bead Width
Test Bead Length
Test Bead Diameter
Test Bead Height (before being hit by probe)
Test Bead Height (after being hit by probe)
Typical Bead-to-Bead Pitch requirement
®
Intel Quark™ SoC X1000
PDG
142
Intel
Stub Stub
<50 <50
mils mils
Parameter
1
®
Quark™ SoC X1000—Design for Testability (DFT)
Recommendation
Units
Beads formed over
solder-mask-openings
mils 4-7
mils 20
NA
mils
mils 7-8
mils 5
mils 50
Order Number: 330258-002US
Beads placed on
existing vias
NA
NA
20
5-6
5
50
June 2014