CS4630 datasheet(14/38 Pages) CIRRUS

14 / 38 page

CS4630

DS445PP1

3. SYSTEM ARCHITECTURES

A typical system diagram depicting connection of

the CS4630 to the CrystalClear CS4297/97A/98/99

AC ’97 Codec is given in Figure 8. All analog au-

dio inputs and outputs are connected to the

CS4297/97A/98/99. Audio data is passed between

the CS4297/97A/98/99 and the CS4630 over the

serial AC-Link. The CS4630 provides a hardware

interface for connection of a joystick and MIDI de-

vices. A second diagram, Figure 9, depicts the

CS4630 supporting dual AC ‘97 codecs in a porta-

ble design. The AC ‘97 interface is connected to the

primary AC ‘97 codec in the portable and is used

for all audio I/O inside and connected to the porta-

ble. The AC ‘97 interface is sent across to the dock-

ing station which contains a second AC ‘97 2.0/2.1

codec, used when the portable is in the docking sta-

tion. Software can disable the audio I/O paths on

the portable that are superseded by docking station

I/O and enable the paths needed in the docking sta-

tion. Note that both interfaces are needed in sys-

tems where the CD-ROM analog input is in the

portable and the Line In/Out jacks on the docking

stations are used. Using the AC ‘97 digital link

across the dock maintains the absolute highest au-

dio quality along with a standard well-defined non-

proprietary interface that will last through many

system generations.

Host

Memory

North

Bridge

CPU

South

Bridge

CS4297

PCI Bus

PC/PCI (if used)

Audio Out

Audio In

Figure 8. AC ‘97 Codec Interface

CS4630

Host

Memory

Pri. AC ’97

Codec

North

Bridge

CPU

South

Bridge

PCI Bus

PC/PCI

(if used)

Audio

Out

Audio

Accelerator

Card Bus

Interface

ZV Port

Bridge

Audio Out

Audio In

Secondary PCI Bus

PORTABLE

DOCKING STATION

Sec. AC ’97

Codec

CS4630

Figure 9. Portable Docking Station Scenario

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