CS4281 Datasheet, PDF (21/36 Pages) Cirrus Logic – CrystalClear PCI Audio interface

CS4281
CrystalClear™ PCI Audio Interface
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#
CS4281
ASDIN2
12.288 MHz
48 kHz
24.576 MHz
BIT_CLK
SYNC
SDATA_OUT
SDATA_IN
RESET#
CS4297/97A
BIT_CLK
SYNC
SDATA_OUT
RESET#
SDATA_IN
MIDIIN
MIDIOUT
JACX, JACY, JBCX, JBCY
JAB1, JAB2, JBB1, JBB2
CS4297A
(AC ’97 2.0)
Joystick/
MIDI Port
Figure 10. Dual AC ‘97 Codec Connection Diagram
CIRRUS LOGIC PRODUCT DATA SHEET
DS308PP4
21