Platform Design Checklist
R
320
Intel
®
855PM Chipset Platform Design Guide
14.8.12. Primary IDE Interface
ICH4-M IDE Interface – Resistor Recommendations
Pin Name
System
Pull up/Pull down
Series
Damping
Notes
9
PDD[15:0]
None
No extra series termination resistors or other
pull ups/pull downs are required. These signals
have integrated series resistors.
PDD7/SDD7 does not require a 10 K
Ω
pull
down resistor.
NOTE:
Simulation data indicates that the
integrated series termination resistors are a
nominal 33
Ω
but can range from 31
Ω
to 43
Ω
.
Refer to ATA ATAPI-4 specification.
PDA[2:0],
PDCS1#,
PDCS3#,
PDDACK#,
PDIOW#, PDIOR#
None
No extra series termination resistors. Pads for
series resistors can be implemented should the
system designer have signal integrity concerns.
These signals have integrated series resistors.
NOTE:
Simulation data indicates that the
integrated series termination resistors are a
nominal 33 but can range from 31 to 43 .
PDDREQ None
No extra series termination resistors.
No pull-down resistors needed.
These signals have integrated series resistors
in the ICH4-M.
These signals have integrated pull down
resistors in the ICH4-M.
PIORDY
Pull up to Vcc3_3
4.7 k
This signal has integrated series resistor in the
ICH4-M
PCI_RST#
22
- 47
The signal must be buffered to form IDE_RST#
for improved signal integrity.
Mobile IDE Swap
Bay Support
See Section 9.1.4 for implementating the ICH4-
M’s IDE interface tri-state feature. This feature
can be used for systems designed to support an
IDE “hot” swap drive bay.
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