82801CA Datasheet, PDF (56/521 Pages) Intel Corporation – I/O Controller Hub 3-S (ICH3-S)

Power Planes and Pin States
3.2
Integrated Pull-Ups and Pull-Downs
Table 3-2. Integrated Pull-Up and Pull-Down Resistors
Signal
EE_DIN
EE_DOUT
GNT[B:A]# / GNT[5]# / GPIO[17:16]
LAD[3:0]# / FWH[3:0]#
LDRQ[1:0]
PME#
PWRBTN#
SPKR
AC_BIT_CLK
AC_SDIN[1:0]
AC_SDOUT
AC_SYNC
LAN_RXD[2:0]
PDD[7] / SDD[7]
PDDREQ / SDDREQ
DPRSLPVR
LAN_CLK
USB[5:0][P:N]
Resistor Type
pull-up
pull-up
pull-up
pull-up
pull-up
pull-up
pull-up
pull-down
pull-down
pull-down
pull-down
pull-down
pull-up
pull-down
pull-down
pull-down
pull-down
pull-down
Nominal Value
24 kΩ
24 kΩ
24 kΩ
24 kΩ
24 kΩ
24 kΩ
24 kΩ
24 kΩ
20 kΩ
20 kΩ
20 kΩ
20 kΩ
9 kΩ
5.9 kΩ
5.9 kΩ
20 kΩ
1 MΩ
15 kΩ
Notes
1
1
1
1
1
1
1
1, 5
2, 6
2
2, 6
2, 5
3
4
4
2
NOTES:
1. Simulation data shows that these resistor values can range from 18 kΩ to 42 kΩ.
2. Simulation data shows that these resistor values can range from 13 kΩ to 38 kΩ.
3. Simulation data shows that these resistor values can range from 6 kΩ to 14 kΩ.
4. Simulation data shows that these resistor values can range from 4.3 kΩ to 20 kΩ.
5. The pull-up or pull-down on this signal is only enabled at boot/reset for strapping function.
6. This pull-down is enabled when either the ACLINK Shut Off bit in the AC ’97 Global Control Register is set or
when both function 5 and function 6 of Dev 31 are hidden (disabled).
3.3
IDE Integrated Series Termination Resistors
Table 3-3 shows the ICH3 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.
3-56
Intel^® 82801CA ICH3-S Datasheet