CS4614 datasheet(16/24 Pages) CIRRUS

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CIRRUS LOGIC PRELIMINARY PRODUCT BULLETIN JUNE 30, 5:03 PM

DS292PP3

CS4614

CrystalClear™ SoundFusion™ PCI Audio Accelerator

EEPROM INTERFACE

The EEPROM configuration interface allows the

connection of an optional external EEPROM de-

vice to provide power-up configuration informa-

tion. The external EEPROM is not required for

proper operation; however, in some applications

power-up configuration settings other than the de-

fault values may be required to support specific

Operating System compatibility requirements.

After a hardware reset, an internal state machine in

the CS4614 will automatically detect the presence

of an external EEPROM device and load the Sub-

system ID and Subsystem Vendor ID fields, along

with two bytes of general configuration informa-

tion, into internal registers. At power-up, the

CS4614 will attempt to read from the external de-

vice, and will check the data received from the de-

vice for a valid signature header. If the header data

is invalid, the data transfer is aborted. After power-

up, the host can read or write from/to the EEPROM

device by accessing specific registers in the

CS4614. Cirrus Logic provides software to read

and write the EEPROM.

The two-wire interface for the optional external

EEPROM device is depicted in Figure 11. During

data transfers, the data line (EEDAT) can change

state only while the clock signal (EECLK) is low.

A state change of the data line while the clock sig-

nal is high indicates a start or stop condition to the

EEPROM device.

+5 V

DSP

1 nF

5.6 nF

2.2 k

Ω

2.2 k

Ω

MIDIIN

MIDIOUT

JAB2

JBB2

JACY

JBCY

JBCX

JACX

JBB1

JAB1

1 nF

2.2 k

Ω

2.2 k

Ω

5.6 nF

4.7 k

Ω

4.7 k

Ω

4.7 k

Ω

4.7 k

Ω

4.7 k

Ω

Figure 10. Joystick Logic

SLIMD SP

Core

EEDAT

EECLK

4.7 k

Ω

2-wire

Serial

EEPROM

Figure 11. External EEPROM Connection

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