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Motherboard Layout and Routing Guidelines
Figure 2-2
ATX and NLX form factor designs.
ATX Form Factor:
1. The ATX placement and layout below is recommended for single (UP) Intel
processor / Intel
2. The example placement below shows 4 PCI slots, 2 ISA slots, 4 DIMM sockets, and one AGP
connector.
3. For an ATX form factor design, the AGP compliant graphics device can be either on the
motherboard (device down option), or on an AGP connector (up option).
4. The trace length limitation between critical connections will be addressed later in this
document.
5. The figure below is for reference only and the trade-off between the number of PCI and ISA
slots, number of DIMM socket, and other motherboard peripherals need to be evaluated for
each design.
Figure 2-2. Example ATX Placement for a UP Pentium
Design
2-2
and
Figure 2-3
show the proposed component placement for a single processor for both
®
440GX AGPset system design.
PCI0
PIIX4E
®
II processor/Intel
I/O Ports
AGP/PCI1
Pentium
Host Interface
PCI Interface
82443GX
AGP Interface
SDRAM Interface
SDRAM DIMMs
Intel
®
®
Pentium
®
440GX AGPset
®
II Slot 1
IDE 0/1
v 0 0 2
®
440GX AGPset Design Guide
II
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