CS4237B datasheet(25/114 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

25 / 114 page

The E

2PROM interface uses an industry standard

2-wire interface consisting of a bi-directional

data line and a clock line driven from the part.

After power-on the part looks for the existence

of an E

2PROM device and loads the user de-

fined data. The existence is determined by the

first two bytes read (0x55 followed by 0xBB). If

the first two bytes are correct, the part reads the

next two bytes to determine the length of data in

the E

2PROM. The length bytes indicate the

number of bytes left to be read (not including

the two validation bytes or two length bytes). As

shown in Figure 3, the E

2PROM is read using a

start bit followed by a dummy write, to initialize

the address to zero. Then another start bit and

device address, followed by all the data. Since

the part uses the sequential read properties of the

E

2PROM, only one E2PROM, is supported

(ganged E

2PROMs are not supported).

Some E

2PROMs that are compatible with this

interface are:

Atmel

AT24Cxx series

MicroChip

24LCxxB series

National

NM24CxxL series

Ramtron

FM24Cxx series

SGS Thompson

ST24Cxx series

Xicor

X24Cxx series

where the xx is replaced by 02, 04, 08, or 16

based on the size of the E

2PROM desired. The

size of 16 (2k bytes) is preferred since it allows

the maximum flexibility for upgrading firmware

patches. Other E

2PROMs compatible with Fig-

ure 3 and the timing parameters listed in the

front of the data sheet may also be used.

The maximum Hardware Configuration and PnP

resource RAM data supported is 384 bytes, and

a four byte header; therefore, the maximum

amount of data storage, without firmware

patches, in E

2PROM would be 388 bytes. The

maximum size E

2PROM supported is 2k bytes.

This allows the inclusion of firmware patches af-

ter the PnP resource data.

If an external E

2PROM exists, it is accessed by

the serial interface and is connected to the XD0

and XA0 pins. The two-wire interface is control-

led by three bits in the Control logical device,

Hardware Control Register (CTRLbase+1). The

serial data can be written to or read from the

E

2PROM by sequentially writing or reading that

register. The three register bits, D0, D1, D2 are

labeled CLK, DOUT, and DIN/EEN respectively.

The DIN/EEN bit, when written to a one, en-

ables the E

2PROM serial interface. When the

DIN/EEN bit is written to a zero, the serial inter-

face is disabled. The DIN/EEN bit is also the

Data In (DIN) signal to read back data from the

E

2PROM. The XD0 pin is a bi-directional open-

drain data line supporting DIN and DOUT;

therefore, to read the correct data, the DOUT bit

must be set to a one prior to performing a read

of the register. Otherwise, the data read back

from DIN/EEN will be all zeros. The E

2PROM

data can then be read from the DIN/EEN bit.

The CLK bit timing is controlled by the host

software. This is the serial clock for the

E

2PROM. The DOUT bit is used to write/pro-

gram the data out to the E

2PROM. An external

pull-up resistor is required on XD0 because it is

an open-drain output. Use the guidelines in the

S 1 0 1 00 00 0 A 0000000 0 A S 1 0100001 A

Data

P

1

A

Start

Part

Address

Start

Acknowledge

No

Acknowledge

Stop

Acknowledge

Data

EEPROM

Write

Read

Bank

Address

Part

Address

Crystal IC

Figure 3. EEPROM Format

DS213PP4

CS4237B

25

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) 25 Page - Cirrus Logic

CS4237B Datasheet(HTML) 25 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