
AMD Geode SC1200/SC1201 Processor Data Book
83
Signal Definitions
Revision 7.1
3.4.15
AC97 Audio Interface Signals
Signal Name
Ball No.
Type
Description
Mux
EBGA
TEPBGA
BIT_CLK
AL14
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
AK13
P29
O
Serial Data Output. This output transmits
audio serial data to the codec.
TFT_PRSNT (Strap)
SDATA_IN
AK14
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
H31
AL8
I
Serial Data Input 2. This input receives
serial data from the secondary codec. This
signal has wakeup capability.
---
SYNC
AL13
P30
O
Serial Bus Synchronization. This bit is
asserted to synchronize the transfer of data
between the SC1200/SC1201 processor and
the AC97 codec.
CLKSEL3 (Strap)
AC97_CLK
AJ14
P31
O
Codec Clock. It is twice the frequency of the
Audio Bit Clock.
---
AC97_RST#
AJ15
U29
O
Codec Reset. S3 to S5 wakeup is not sup-
ported because AC97_RST# is powered by
VIO. 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
AL15
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
EBGA
TEPBGA
CLK32
H29
AH8
O
32.768 KHz Output Clock
---
GPWIO0
E31
AH6
I/O
General Purpose Wakeup I/Os. These sig-
nals each have an internal pull-up of 100 K
.
---
GPWIO1
G28
AK5
---
GPWIO2
G29
AJ6
---
LED#
D31
AL4
O
LED Control. Drives an externally connected
LED (on, off or a 1 Hz blink). Sleeping /
Working indicator. This signal is an open-
drain output.
---
ONCTL#
E30
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 out-
put.
---