82801BA datasheet(48/498 Pages) INTEL

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Signal Description

2-12

82801BA ICH2 and 82801BAM ICH2-M Datasheet

2.17

AC’97 Link

NOTE: If the ACLINK Shutoff bit in the AC’97 Global Control Register (See Section 13.2.8) is set to 1, internal

pull-down resistors will be enabled on AC_BIT_CLK and AC_SDATA_IN[1:0]. If ACLINK Shutoff is

cleared to 0, these pull-down resistors are disabled. If there is no codec down on the system board, the

two signals AC_SDIN[1:0] should be pulled down externally with a resistor to ground.

2.18

General Purpose I/O

Table 2-17. AC’97 Link Signals

Name

Type

Description

AC_RST#

AC97 Reset: Master H/W reset to external Codec(s)

AC_SYNC

AC97 Sync: 48 KHz fixed rate sample sync to the Codec(s)

AC_BIT_CLK

AC97 Bit Clock: 12.288 MHz serial data clock generated by the external

Codec(s). See Note.

AC_SDOUT

AC97 Serial Data Out: Serial TDM data output to the Codec(s)

Note: AC_SDOUT is sampled at the rising edge of PWROK as a functional

strap. See Section 2.20.1 for more details.

AC_SDIN[1:0]

AC97 Serial Data In 0: Serial TDM data inputs from the Codecs. See Note.

Table 2-18. General Purpose I/O Signals

Name

Type

Description

GPIO[31:29]

Not implemented.

GPIO[28:27]

I/O

Can be input or output. Resume power well. Unmuxed.

GPIO[26]

I/O

Not implemented.

GPIO[25]

I/O

Can be input or output. Resume power well. Not Muxed.

GPIO[24]

(ICH2 only)

I/O

Can be input or output. Resume power well.

GPIO[23]

(ICH2 only)

Fixed as Output only. Main power well.

GPIO[22]

(ICH2 only)

Fixed as Output only. Main power well. Open-drain output.

GPIO[21]

Fixed as Output only. Main power well.

GPIO[20:18]

(ICH2 only)

Fixed as Output only. Main power well.

GPIO[17:16]

Fixed as Output only. Main Power Well. Can instead be used for PC/PCI

GNT[A:B]#. GPIO[17] can also alternatively be used for PCI GNT[5]#. Integrated

pull-up resistor.

GPIO[15:14]

Not implemented.

GPIO[13:12]

Fixed as Input only. Resume Power Well. Not muxed.

GPIO[11]

Fixed as Input only. Resume Power Well. Can instead be used for SMBALERT#.

GPIO[10:9]

Not implemented.

GPIO[8]

Fixed as Input only. Resume Power Well. Not muxed.

GPIO[7]

Fixed as Input only. Main power well. Not muxed.

GPIO[6]

(ICH2 only)

Fixed as Input only. Main power well.

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