15 ac97 audio interface signals, 16 power management interface signals – AMD Geode SC1201 User Manual
Page 65
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.
---