CS4237B datasheet(27/114 Pages) CIRRUS

Part #	CS4237B

Description	CrystalClear Advanced Audio System with 3D Sound

Download	114 Pages

Scroll/Zoom	100%

Manufacturer	CIRRUS [Cirrus Logic]

Direct Link	http://www.cirrus.com

Logo

27 / 114 page

MODE 1. Except for the Capture Data Format

(I28), Capture Base Count (I30/31), and Alter-

nate Feature Status (I24) registers, all other

Mode 2 functions retain their values when re-

t ur ni n g to M od e 1 . T h e WS S C ode c is

ba ckwa rds co mp ati ble wit h t he CS4236,

CS4232, CS4231 and CS4248.

The additional MODE 2 functions are: full-du-

plex support, a programmable timer, Mono In

and Mono Out support.

MODE 3 is selected by setting CMS1,0 to 11.

MODE 3 allows access to new bits in the indi-

rect registers I0-I31, and allows access to a third

set of "extended registers" which are designated

X0-X17+X25. The extended registers are ac-

cessed through I23. The additional MODE 3

functions are:

1. A full symmetrical mixer. This changes the in-

put multiplexer to a input mixer.

2. Independent sample frequency control on the

ADCs and DACs.

3. Programmable Gain and Attenuation on the

Microphone inputs.

4. Independent control over the volume of inter-

nal FM synthesis and external wavetable.

5. Volume control on the DSP serial port input

data.

6. Stereo volume on the monitor feedback path.

FIFOs

The WSS Codec contains 16-sample FIFOs in

both the playback and capture digital audio data

paths. The FIFOs are transparent and have no

programming associated with them.

When playback is enabled, the playback FIFO

continually requests data until the FIFO is full,

and then makes requests as positions inside the

FIFO are emptied, thereby keeping the playback

FIFO as full as possible. Thus when the system

cannot respond within a sample period, the FIFO

starts to empty, avoiding a momentary loss of

audio data. If the FIFO runs out of data, the last

valid sample can be continuously output to the

DACs (if DACZ in I16 is set) which will elimi-

nate pops from occurring.

When capture is enabled, the capture FIFO tries

to continually stay empty by making requests

every sample period. Thus when the system can-

not respond within a sample period, the capture

FIFO starts filling, thereby avoiding a loss of

data in the audio data stream.

WSS Codec PIO Register Interface

Four I/O mapped locations are available for ac-

cessing the Codec functions and mixer. The

control registers allow access to status, audio

data, and all indirect registers via the index reg-

isters. The IOR and IOW signals are used to

define the read and write cycles respectively. A

PIO access to the Codec begins when the host

puts an address on to the ISA bus which matches

WSSbase and drives AEN low. WSSbase is pro-

grammed during a Plug and Play configuration

sequence. Once a valid base address has been

decoded then the assertion of IOR will cause the

WSS Codec to drive data on the ISA data bus

lines. Write cycles require the host to assert data

on the ISA data bus lines and strobe the IOW

signal. The WSS Codec will latch data into the

PIO register on the rising edge of the IOW

strobe.

The audio data interface typically uses DMA re-

quest/grant pins to transfer the digital audio data

between the WSS Codec and the bus. The WSS

Codec is responsible for asserting a request sig-

nal whenever the Codec’s internal buffers need

updating. The bus responds with an acknowledge

signal and strobes data to and from the Codec, 8

bits at a time. The WSS Codec keeps the request

DS213PP4

CS4237B

27

Similar Part No. - CS4237B

Manufacturer	Part #	Datasheet	Description
Shenzhenshi YONGFUKANG ...	CS4230E	2Mb / 11P	Charge Pump
List of Unclassifed Man...	CS4231A	2Mb / 76P	PARALLEL INTERFACE MULTIMEDIA AUDIO CODEC
	CS4231A-KL	2Mb / 76P	PARALLEL INTERFACE MULTIMEDIA AUDIO CODEC
	CS4231A-KQ	2Mb / 76P	PARALLEL INTERFACE MULTIMEDIA AUDIO CODEC
Cirrus Logic	CS42324	1Mb / 71P	10-In, 6-Out, 2 Vrms Audio CODEC

More results

Similar Description - CS4237B

Manufacturer	Part #	Datasheet	Description
Toshiba Semiconductor	TA2136FG	197Kb / 7P	Sound Retrieval System; 3D Sound IC
Cirrus Logic	CS4239	1Mb / 98P	CrystalClear??Portable ISA Audio System
Cirrus Logic	CS4235	1,012Kb / 94P	CrystalClear Low Cost ISA Audio System
New Japan Radio	NJW1160	620Kb / 26P	AUDIO PROCESSOR with SOUND ENHANCEMENT and SRS 3D STEREO
National Semiconductor ...	LM4859	1Mb / 29P	Stereo 1.2W Audio Sub-system with 3D Enhancement
	LM4844	633Kb / 26P	Stereo 1.2W Audio Sub-System with 3D Enhancement
	LM4859	1Mb / 29P	Stereo 1.2W Audio Sub-system with 3D Enhancement
	LM4857	1Mb / 38P	Stereo 1.2W Audio Sub-system with 3D Enhancement
	LM4857	1Mb / 37P	Stereo 1.2W Audio Sub-system with 3D Enhancement
	LM4844	983Kb / 21P	Stereo 1.2W Audio Sub-system with 3D Enhancement

More results

CS4237B Datasheet(PDF) 27 Page - Cirrus Logic

CS4237B Datasheet(HTML) 27 Page - Cirrus Logic

Similar Part No. - CS4237B

Similar Description - CS4237B

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL