Board Description; Example Nlx Placement For A Up Intel - Intel 440GX Design Manual

NLX Form Factor:
1. The NLX placement and layout below is recommended for a single (UP) Intel
processor / Intel
2. The example placement below shows one Slot 1 connector, 4 DIMM sockets, and an AGP
compliant device down.
3. For an NLX form factor design, the AGP compliant graphics device may readily be integrated
on the motherboard (device down option).
4. The trace length limitation between critical connections will be addressed later in this
document.
5. Figure 2-3
other motherboard peripherals need to be evaluated for each design.
Figure 2-3. Example NLX Placement for a UP Intel
Design
2.2

Board Description

For a single processor / Intel
is recommended. The stack up of the board is shown in
layers are to be between 50 and 80 ohms. Lower trace impedance will reduce signal edge rates,
over & undershoot, and have less cross-talk than higher trace impedance. Higher trace impedance
will increase edge rates and may slightly decrease signal flight times.
®
Intel 440GX AGPset Design Guide
®
440GX AGPset system design.
is for reference only and the trade-off between the number of DIMM sockets, and
SDRAM DIMMs
SDRAM
Interface
C K B F
82443GX
Host Interface
®
Pentium II Slot 1
®
440GX AGPset motherboard design, a 4 layer stack-up arrangement
Motherboard Layout and Routing Guidelines
® ®
Pentium II processor / Intel
AGP
AGP Interface
PCI Interface
PIIX4E
PCI0/ISA Riser
Figure 2-4. The impedance of all the signal
® ®
Pentium II
®
440GX
v003
2-3