Mobile Intel Pentium 4 Processor - M and Intel 845MP/MZ Chipset Platform Design Guide

Mobile Intel
®
Pentium
®
4 Processor-M and Intel
®
845MP/845MZ Chipset Platform
Design Guide 103
R
9.1.2. Secondary IDE Connector Requirements
Figure 48. Connection Requirements for Secondary IDE Connector
4.7K
ohm
Reset#
Secondary IDE Connector
ICH3-M
SDD[15:0]
PCIRST#
SDA[2:0]
SDCS1#
SDCS3#
SDIOR#
SDIOW#
SDDACK#
IRQ15
SDDREQ
SIORDY
*Due to ringing, PCIRST# must
be buffered.
3.3V
8.2K-10K
ohm
22 - 47 ohm
PCIRST_BUF#
*
CSEL
Pin32,34N.C.
GPIOy
10K ohm
3.3V3.3V
PDIAG#/
CBLID#
• 22-Ω to 47-Ω series resistors are required on RESET#. The correct value should be determined for
each unique motherboard design, based on signal quality.
• An 8.2-kΩ to 10-kΩ pull-up resistor is required on IRQ14 and IRQ15 to Vcc3_3.
• A 4.7-KΩ pull-up resistor to Vcc3_3 is required on PIORDY and SIORDY
• Series resistors can be placed on the control and data line to improve signal quality. The resistors
are placed as close to the connector as possible. Values are determined for each unique motherboard
design.