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15 ac97 audio interface signals, 16 power management interface signals – AMD Geode SC1201 User Manual

Page 65

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AMD Geode™ SC1200/SC1201 Processor Data Book

65

Signal Definitions

32579B

3.4.15

AC97 Audio Interface Signals

Signal Name

Ball No.

Type

Description

Mux

BIT_CLK

U30

I

Audio Bit Clock. The serial bit clock from the codec.

Note:

If selected as BIT_CLK function but not used, tie
BIT_CLK low.

F_TRDY#

SDATA_OUT

P29

O

Serial Data Output. This output transmits audio serial
data to the codec.

TFT_PRSNT (Strap)

SDATA_IN

U31

I

Serial Data Input. This input receives serial data from
the primary codec.

Note:

If selected as SDATA_IN function but not used,
tie SDATA_IN low.

F_GNT0#

SDATA_IN2

AL8

I

Serial Data Input 2. This input receives serial data from
the secondary codec. This signal has wakeup capability.

---

SYNC

P30

O

Serial Bus Synchronization. This bit is asserted to syn-
chronize the transfer of data between the SC1200/
SC1201 processor and the AC97 codec.

CLKSEL3 (Strap)

AC97_CLK

P31

O

Codec Clock. It is twice the frequency of the Audio Bit
Clock.

---

AC97_RST#

U29

O

Codec Reset. S3 to S5 wakeup is not supported
because AC97_RST# is powered by V

IO

. If wakeup from

states S3 to S5 are needed, a circuit in the system board
should be used to reset the AC97 codec.

F_STOP#

PC_BEEP

V31

O

PC Beep. Legacy PC/AT speaker output.

GPIO16+

F_DEVSEL#

3.4.16

Power Management Interface Signals

Signal Name

Ball No.

Type

Description

Mux

CLK32

AH8

O

32.768 KHz Output Clock

---

GPWIO0

AH6

I/O

General Purpose Wakeup I/Os. These signals each
have an internal pull-up of 100 K

Ω.

---

GPWIO1

AK5

---

GPWIO2

AJ6

---

LED#

AL4

O

LED Control. Drives an externally connected LED (on,
off or a 1 Hz blink). Sleeping / Working indicator. This sig-
nal is an open-drain output.

---

ONCTL#

AJ5

O

On / Off Control. This signal indicates to the main power
supply that power should be turned on. This signal is an
open-drain output.

---

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