82801AB datasheet(38/414 Pages) INTEL

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Signal Description

2-10

82801AA and 82801AB Datasheet

2.13

Other Clocks

2.14

Miscellaneous Signals

2.15

AC’97 Link

These signals are for Device 31:Functions 5 and 6.

Table 2-13. Other Clocks

Name

Type

Description

CLK14

Oscillator Clock: Used for 8254 timers. Runs at 14.31818 MHz. This clock is permitted

to stop during S3 (or lower) states.

CLK48

48 MHz Clock: Used to run the USB controller. Runs at 48 MHz. This clock is permitted

to stop during S3 (or lower) states.

CLK66

66 MHz Clock: Used to run the hub interface. Runs at 66 MHz. This clock is permitted to

stop during S3 (or lower) states.

Table 2-14. Miscellaneous Signals

Name

Type

Description

SPKR

Speaker: The SPKR signal is the output of counter 2 and is internally "ANDed" with

Port 61h bit 1 to provide Speaker Data Enable. This signal drives an external speaker

driver device, which in turn drives the system speaker. Upon PCIRST#, its output state

is 1.

Note: SPKR is sampled at the rising edge of PWROK as a functional strap. See

Section 2.18.1 for more details.

RTCRST#

RTC Reset: When asserted, this signal resets register bits in the RTC well and sets the

RTC_PWR_STS bit (bit 2 in GEN_PMCON3 register). This signal is also used to enter

the test modes documented in Section 2.18.2.

Table 2-15. 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)

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 2.18.1 for more details.

AC_SDIN 0

AC97 Serial Data In 0: Serial TDM data input from a Codec

AC_SDIN 1/

GPIO[9]

AC97 Serial Data In 1: Serial TDM data input from a Codec.

Note: If a separate codec is not used, this signal can be used as a GPI.

82801AB Datasheet(PDF) 38 Page - Intel Corporation

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