CS4630 datasheet(21/38 Pages) CIRRUS

21 / 38 page

CS4630

DS445PP1

depicting the Dual AC ’97 codec configuration as a

docking station is given in Figure 9. In this scenar-

io, the first codec is used in the portable for tradi-

tional functions such as analog support for the

portable’s Line In, Mic In, and Line Out jacks. The

AC Link to the dock is buffered and sent across to

the

docking

station

support

second

CS4297A/98/99 that supports the dock’s analog

jacks. When the system gets a message that the

docking station is attached, the software can re-

place the portable’s analog jack control for the

docking station’s jacks seemlessly. Using a stan-

dard AC Link for the docking station support main-

tains the highest quality of audio over analog

docking station scenarios. In addition, since the AC

Link is a standard, the docking station can be uti-

lized over a number of portable generations with-

out concern for obsolescence.

The signal connections between the CS4630 and

the dual Codecs are shown in Figure 12. In this

configuration, both AC ‘97 codecs run off the same

ABITCLK with the primary AC ’97 Codec being

the timing master for the first AC Link and for the

CS4630. The secondary CS4297/97A/98/99 and

the CS4630 are slaves to the incoming ABITCLK.

Full FIFO buffers for both codecs are supported.

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#

ASDIN2

BIT_CLK

SYNC

SDATA_OUT

SDATA_IN

RESET#

24.576 MHz

CS4297/97A/99

Secondary

AC’97 2.0 Codec

12.288 MHz

48 kHz

Figure 12. Dual AC ‘97 Codec Connection Diagram

CS4630

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