82801AB datasheet(47/414 Pages) INTEL

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82801AB and 82801AA Datasheet

3-5

Power Planes and Pin States

3.4

Integrated Pull-Ups and Pull-Downs

Table 3-4 shows the ICH signals that have integrated pull-up or pull-down resistors.

NOTES:

1. The pull-up or pull-down on this signal is only enabled at boot/reset for strapping function.

2. The pull-down resistor on this signal is only enabled when the ACLINK Shut Off bit in the AC’97 Global

Control Register (in AC’97 I/O space) is set to 1. At all other times, the pull-down resistor is disabled.

3.5

IDE Integrated Series Termination Resistors

Table 3-5 shows the ICH IDE signals that have integrated series termination resistors.

NOTES:

1. Simulation data indicates that these integrated series termination resistors are a nominal 33 ohms; they can

range from 28 ohms to 46 ohms.

2. Simulation data indicates that these integrated series termination resistors are a nominal 22 ohms; they can

range from 19 ohms to 29 ohms.

Table 3-4. Integrated Pull-Ups and Pull-Downs

Signal

Resistor Value

Resistor Type

PME#

9K ±3K

pull-up

PWRBTN#

9K ±3K

pull-up

LAD[3:0]# / FWH[3:0]#

9K ±3K

pull-up

SPKR1

22K ±4K

pull-up

AC_SDOUT1

22K ±4K

pull-down

AC_SDIN[1] / GPIO[9]2

22K ±4K

pull-down

AC_SDIN[0]2

22K ±4K

pull-down

AC_BITCLK2

22K ±4K

pull-down

Table 3-5. IDE Series Termination Resistors

Signal

Integrated Series Termination Resistor Value

Notes

PDD[15:0], SDD[15:0]

approximately 33 ohms

PDIOW#, SDIOW#, PDIOR#, PDIOW#,

PDREQ, SDREQ, PDDACK#, SDDACK#,

PIORDY, SIORDY, PDA[2:0], SDA[2:0],

PDCS1#, SDCS1#, PDCS3#, SDCS3#,

IRQ14, IRQ15

approximately 22 ohms

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