CS4237B datasheet(26/114 Pages) CIRRUS

Part #	CS4237B

Description	CrystalClear Advanced Audio System with 3D Sound

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Manufacturer	CIRRUS [Cirrus Logic]

Direct Link	http://www.cirrus.com

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specific E

2PROM data sheet to select the value

of the pull-up resistor (a typical value would be

3.3k

Ω).

Programming the E

2PROM:

1. Configure Control I/O base address by one

of two methods: regular PnP cycle or Crystal

Key method.

a. The host can use the regular PnP cycle to

program the logical device 2 I/O base ad-

dress, and then place the chip in the

wait_for_key_state

b. If the Crystal Key method is used:

First, write to I/O 0279h, send the 32-

byte Crystal key. (The Crystal Key only

supports one Crystal part per system.)

Second, configure the Control I/O base

address by writing 15h, 02h, 47h, 01h,

20h, 33h, 01h, 79h to 0279h.

2. Refer to the specific data sheet for the

E

2PROM you are using for timing require-

ments and data format. Also, refer to the

Loading Resource Data section of this data

sheet for the E

2PROM resource data format.

3. Send the E

2PROM data in successive bits to

CTRLbase+1 (Hardware Control Register)

while following the E

2PROM data sheet for-

mat.

The E

2PROM now contains the PnP resource

data. For this new data to take effect, the part

must be reset, causing the part to read the

E

2PROM during initialization. Crystal can pro-

vide a utility, RESOURCE.EXE, to program

E

2PROMs through the Control logical device in-

terface.

WINDOWS SOUND SYSTEM CODEC

The WSS Codec software interface consists of 4

I/O locations starting at the Plug and Play ad-

dress ’WSSbase’, and supports 12-bit address

decoding. If the upper address bits, SA12-SA15

are used, they must be 0 to decode a valid ad-

dress. The WSS Codec also requires one

interrupt and one or preferably two DMA chan-

nels, one for playback and one for capture. Since

the WSS Codec and Sound Blaster device are

mutually exclusive, the two devices share the

same interrupt and DMA playback channel.

The WSS Codec/Mixer is register compatible

with the Microsoft Windows Sound System.

Functions include stereo Analog-to-Digital and

Digital-to-Analog converters (ADCs and DACs),

analog mixing, anti-aliasing and reconstruction

filters, line and microphone level inputs, optional

A-Law/

µ-Law coding, simultaneous capture and

playback (at independent sample frequencies)

and a parallel bus interface. Five analog inputs

are provided and four can be mixed to the ADC

mixer. All five can be mixed with the output of

the DAC with full volume control. Several data

modes are supported including 8- and 16-bit lin-

ear as well as 8-bit companded, 4-bit ADPCM

compressed, and 16-bit big Endian.

Enhanced Functions (MODEs)

The initial state is labeled MODE 1 and forces

the part to appear as a CS4248. The more popu-

lar second mode, MODE 2, forces the part to

appear as a CS4231 super set and is compatible

with the CS4232. To switch from MODE 1 to

MODE 2, the CMS1,0 bits, in the MODE and

ID register (I12), should be set to 10 respec-

tively. When MODE 2 is selected, the bit IA4 in

the Index Address register (R0) will be decoded

as a valid index pointer providing 16 additional

registers and increased functionality over the

CS4248.

To reverse the procedure, set the CMS1,0 bits to

00 and the part will resume operation in

DS213PP4

CS4237B

26

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CS4237B Datasheet(PDF) 26 Page - Cirrus Logic

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