STAC9721 Datasheet, PDF (7/48 Pages) List of Unclassifed Manufacturers – Stereo AC 97 Codec With Multi-Codec Option

SigmaTel, Inc.
Data Sheet
STAC9721
1. PIN/SIGNAL DESCRIPTIONS
1.1 Digital I/O
These signals connect the STAC9721/23 to its AC'97 controller counterpart, an external crystal, multi-
codec selection and external audio amplifier.
Table 3. Digital Signal List
Signal Name Type
Description
RESET #
I
AC'97 Master H/W Reset
XTL_IN
I
24.576 MHz Crystal
XTL_OUT
O
24.576 MHz Crystal
SYNC
I
48 kHz fixed rate sample sync
BIT_CLK
O
12.288 MHz serial data clock
SDATA_OUT
I
Serial, time division multiplexed, AC'97 input stream
SDATA__IN
O Serial, time division multiplexed, AC'97 output stream
CID0
I
Multi-Codec ID select – bit 0
CID1
I
Multi-Codec ID select – bit 1
EAPD
O
External Amplifier Power Down
# denotes active low
7
04/07/00
04/07/00