82801DB Datasheet, PDF (58/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

Intel^® ICH4 Power Planes and Pin States
3.2
Integrated Pull-Ups and Pull-Downs
Table 3-2. Integrated Pull-Up and Pull-Down Resistors
Signal
AC_BITCLK
AC_RST#
AC_SDIN[2:0]
AC_SDOUT
AC_SYNC
EE_DIN
EE_DOUT
GNT[B:A]# / GNT[5]# /
GPIO[17:16]
LAD[3:0]# / FWH[3:0]#
LDRQ[1:0]
LAN_RXD[2:0]
LAN_CLK
PME#
PWRBTN#
PDD[7] / SDD[7]
PDDREQ / SDDREQ
SPKR
USB[5:0] [P,N]
Resistor Type
pull-down
pull-down
pull-down
pull-down
pull-down
pull-up
pull-up
pull-up
pull-up
pull-up
pull-up
pull-down
pull-up
pull-up
pull-down
pull-down
pull-down
pull-down
Nominal Value
20 kΩ
20 kΩ
20 kΩ
20 kΩ
20 kΩ
20 kΩ
20 kΩ
20 kΩ
20 kΩ
20 kΩ
10 kΩ
100 kΩ
20 kΩ
20 kΩ
11.5 kΩ
11.5 kΩ
20 kΩ
15 kΩ
Notes
1
2
2
2, 8
2, 8
3
3
3
3
3
4
5
3
3
6
6
2, 8
7
NOTES:
1. Simulation data shows that these resistor values can range from 10 kΩ to 40 kΩ.
2. Simulation data shows that these resistor values can range from 9 kΩ to 50 kΩ.
3. Simulation data shows that these resistor values can range from 15 kΩ to 35 kΩ
4. Simulation data shows that these resistor values can range from 7.5 kΩ to 16 kΩ.
5. Simulation data shows that these resistor values can range from 45 kΩ to 170 kΩ
6. Simulation data shows that these resistor values can range from 5.7 kΩ to 28.3 kΩ.
7. Simulation data shows that these resistor values can range from 14.25 kΩ to 24.8 kΩ
8. The pull-up or pull-down on this signal is only enabled at boot/reset for strapping function.
3.3
IDE Integrated Series Termination Resistors
Table 3-3 shows the ICH4 IDE signals that have integrated series termination resistors.
Table 3-3. IDE Series Termination Resistors
Signal
PDD[15:0], SDD[15:0, PDIOW#, SDIOW#, PDIOR#, PDIOW#, PDREQ,
SDREQ, PDDACK#, SDDACK#, PIORDY, SIORDY, PDA[2:0], SDA[2:0],
PDCS1#, SDCS1#, PDCS3#, SDCS3#, IRQ14, IRQ15]
Integrated Series Termination
Resistor Value
approximately 33 Ω (See Note)
NOTE: Simulation data indicates that the integrated series termination resistors are a nominal 33 Ω but can
range from 31 Ω to 43 Ω.
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Intel^® 82801DB ICH4 Datasheet