DS308PP4

21

CS4281

CrystalClear™ PCI Audio Interface

CIRRUS LOGIC PRODUCT DATA SHEET

The dual codec architecture of AC ‘97, version 2.1, is supported wherein the second codec uses the same

pins from the primary, with the exception of a separate serial data-in line (ASDIN2) illustrated in

Figure 10. The Primary Codec is the timing master for the digital audio link and the CS4281. The ASD-

OUT output supports data transmission on nine of the output sample slots (output slots 3 - 11). The ASDIN

and ASDIN2 inputs support receiving of audio sample data on nine of the input sample slots (input slots

3 - 11).

ABITCLK

ASYNC

ASDOUT

ASDIN

ARST#

MIDIIN

MIDIOUT

JACX, JACY, JBCX, JBCY

JAB1, JAB2, JBB1, JBB2

Joystick/

MIDI Port

BIT_CLK

SYNC

SDATA_OUT

SDATA_IN

RESET#

24.576 MHz

CS4297/97A

12.288 MHz

48 kHz

ASDIN2

BIT_CLK

SYNC

SDATA_OUT

SDATA_IN

RESET#

CS4297A

(AC ’97 2.0)

CS4281

Figure 10. Dual AC ‘97 Codec Connection Diagram