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Intel
®
440GX AGPset Design Guide
3-21
Design Checklist
One resistor per IDE connector is recommended for all signals. For signals labeled as 22-47Ω, the
correct value should be determined for each unique motherboard design, based on signal quality.
RESET comes from the PIIX4E RSTDRV signal through a Schmitt trigger
The design consideration shown above illustrates the series resistor placement for trace lengths not
exceeding 4 inches. Note that if the trace length between the PIIX4E and the IDE header exceeds 4
inches, the series resistors should be placed within 1 inch of the PIIX4E. The series termination
resistors are required in either design.
Figure 3-4. Series Resistor Placement for Primary IDE Connectors
PDD
[
15:0
]
PDDREQ
PDIOR#
PDIOW#
PIORDY
IRQ14
PDDACK#
PDA
[
2:0
]
PDCS1#
PDCS3#
33 ohm
33 ohm
33 ohm
33 ohm
1k ohm
33 ohm
33 ohm
22 - 47 ohm
22 - 47 ohm
470 ohm
5.6k ohm
5V
Reset#
Primary IDE Connector
CSEL
Pin32,34
74HCT14
RSTDRV
22 - 47 ohm
PIIX4E
N.C.
10K ohm
PDD7
v010
33 ohm