Ide Checklist - Intel 815EG Design Manual

System Design Checklist
14.4.16

IDE Checklist

Checklist Items
PDD[15:0],
SDD[15:0]
PDIOW#, PDIOR#,
PDDACK#, PDA[2:0],
PDCS1#, PDCS3#,
SDIOW#, SDIOR#,
SDDACK#, SDA[2:0],
SDCS1#, SDCS3#
PDREQ
SDREQ
PIORDY
SIORDY
IRQ14, IRQ15
IDERST#
Cable Detect:
The maximum trace length from the ICH2 to the ATA connector is 8 inches.
188
• No extra series termination resistors or other pull-ups/pull-downs are required.
These signals have integrated series resistors. Note that simulation data
indicates that the integrated series termination resistors can range from 31 Ω
to 43 Ω .
• PDD7/SDD7 does not require a 10 k Ω pull-down resistor.
Refer to ATA ATAPI-4 specification.
• 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 that simulation data indicates
that the integrated series termination resistors can range from 31 Ω to 43 Ω .
• No extra series termination resistors. No pull-down resistors needed.
• These signals have integrated series resistors in the ICH2. These signals have
integrated pull-down resistors in the ICH2.
• No extra series termination resistors. These signals have integrated series
resistors in the ICH2. Pull-up to VCC3.3 via a 4.7 k Ω resistor.
• Recommend 8.2 k Ω —10 k Ω pull-up resistors to VCC3.3.
• No extra series termination resistors.
• The PCIRST# signal should be buffered to form the IDERST# signal. A 33 Ω
series termination resistor is recommended on this signal.
• Host Side/Device Side Detection:
 Connect IDE pin PDIAG/CBLID to an ICH2 GPIO pin. Connect a 10 k Ω
resistor to GND on the signal line. The 10 k Ω resistor to GND prevents GPI
from floating if no devices are present on either IDE interface. Allows use of
3.3 V and 5 V tolerant GPIOs.
• Device Side Detection:
 Connect a 0.047 µ F capacitor from IDE pin PDIAG/CBLID to GND. No ICH2
connection. Note that all ATA66/ATA100 drives will have the capability to
detect cables
Intel
Recommendations
®
815EG Chipset Platform Design Guide
R