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
208 Design Guide
R
12.19. CPU Signals
Table 104. CPU Signals
Signal Group Recommendation Reason
FERR#,IERR#,PROCHOT#,
*THRMTRIP#
**Translation circuit is required
between CPU and ICH3
Pullup at Rtt_CPU=56_5%
Pullup at Vcc_Rcvr=300_5%
Voltage translation
LINT1/INTR, LINT0/NMI, DPSLP#,
SLP#, STPCLK#, IGNNE#, SMI#,
A20M#, CPUPERF#
Pullup 200 Ohm_5% to Vtt_CPU VCC_CORE<1.3 V
PWRGOOD Pullup 300 Ohm_5% to Vtt_CPU VCC_CORE<1.3 V
INIT# **Translation circuit is required
between ICH3 and FWH
Pullup at Rtt_CPU=200_5%
Rtt_FWH=300_5%
12.20. IDE Checklist
Table 105. IDE Checklist
Checklist Items Recommendations Reason/Impact
PDD[15:0],
SDD[15:0]
No extra series termination resistors or
other pull-ups/pull-downs are required.
• PDD7/SDD7 does not require a 10 KΩ
pull-down resistor.
Refer to ATA ATAPI-4 specification.
These signals have integrated series resistors.
NOTE: Simulation data indicates that the
integrated series termination resistors are a
nominal 33Ω, but can range from 31 Ω to 43
Ω.
PDIOW#, PDIOR#,
PDDACK#, PDA[2:0],
PDCS1#, PDCS3#,
SDIOW#, SDIOR#,
SDDACK#, SDA[2:0],
SDCS1#, SDCS3#
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 Ω, but can range from 31 Ω
ohms to 43 Ω.
PDREQ,
SDREQ
No extra series termination resistors.
No pull-down resistors needed.
These signals have integrated series resistors
in the ICH3.
These signals have integrated pull-down
resistors in the ICH3-M.
PIORDY,
SIORDY
No extra series termination resistors.
Pull up to VCCV
CC
3.33_3 via a 4.7 KΩ
resistor.
These signals have integrated series resistors
in the ICH3-M.
IRQ14, IRQ15 Recommend 8.2 KΩ—10 KΩ pull-up
resistors to VCCV
CC
3.33_3.
No extra series termination resistors.
Open drain outputs from drive.