Power Plane Partitions For Socket-370 Motherboard; Figure 2-16. Atx Power Plane Partitions For Socket-370 System - VIA Technologies Apollo Pro133A Design Manual

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2.2.6.2 Power Plane Partitions for Socket-370 Motherboard

Figure 2-16 shows the power plane partitions on a typical ATX form factor. The island associated with VCC_CORE covers the
whole area of the PPGA socket for the Socket-370 CPU. The VCC3 island covers an area that contains the North Bridge chip, the
South Bridge chip, all DIMM slots and a half of the AGP slot. The VDDQ island occupies most AGP signal routing area. The
rest of the power layer belongs to VCC5. Different power plane partitions for Micro-ATX form factor are shown in Figure 2-17.
The distribution of power islands is almost the same between ATX and Micro-ATX, except the smaller VCC5 island on the power
layer of the Micro-ATX.
Preliminary Revision 0.5, November 19, 1999
VCC5 Island
VCC3 Island
VT82C
686A
VCC5 Island

Figure 2-16. ATX Power Plane Partitions for Socket-370 System

Design Guide - VT82C694X Apollo Pro133 with VT82C686A
VCC_CORE
37
Island
1
A
VDDQ Island
IDE1
IDE2
23
Back Panel Area
VCC5 Island
AN
VCC3 Island
694X
510-PIN
FDC
VCC5 Island
Motherboard Design Guidelines
CLK
GEN.