Signal Definitions (Continued)
3.3V Plane
(VCC3)
1
37
A
A
2.9V Plane
(VCC2)
Geode™ GXm
Processor
3.3V Plane
(VCC3)
3.3V Plane
(VCC3)
320 SPGA - Top View
2.9V Plane
(VCC2)
AN
AN
1
37
To 2.9V
Regulator
3.3V Plane
(VCC3)
Legend
= High frequency capacitor
= 220 µF, low ESR capacitor
= 3.3V connection
Note: Where signals cross plane splits, it is recommended to include AC
decoupling between planes with 47pF capacitors.
= 2.9V connection
Figure 2-7. SPGA Recommended Split Power Plane and Decoupling
Revision 3.1
37
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