DS4201

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APPENDIX A: DS4201 USB COMMANDS AND REQUESTS

USB commands and command forms not listed here are not supported by the DS4201. The DS4201 will

respond to unsupported commands with a STALL handshake on the Control endpoint as defined in the

USB core and ADC specifications.

USB CORE SPECIFICATION REQUESTS

DS4201 SUPPORTED USB CORE DEVICE REQUESTS

STANDARD DEVICE REQUESTS

TARGET ELEMENT

RANGE

NOTES

SET_ADDRESS

Device

0x01 - 0xFF

SET_CONFIGURATION

Device

0x00 – 0x01

1

GET_CONFIGURATION

Device

0x00 – 0x01

GET_DESCRIPTOR

Device

2

GET_INTERFACE

STREAMING Interface

INFC0:0x00

INFC1:0x00 – 0x05

3,4

SET_INTERFACE

STREAMING Interface

INFC0:0x00

INFC1:0x00 – 0x05

3,4

GET_STATUS

Device, Interfaces, Endpoints 0-2

5,6,7

NOTES:

1. The only valid configuration values are 0 and 1 for the SET_CONFIGURATION request.

Configuration value 0 corresponds to the non–configured state.

2. Only

the

DEVICE

and

CONFIGURATION

descriptor

types

are

supported

for

the

GET_DESCRIPTOR request.

3. There are no alternate settings for the Control Interface (INFC0).

4. Interface settings for the Streaming Interface are defined in the Audio Streaming Interface section.

5. The DS4201 is intended, at a minimum, to be partially bus powered. GET_STATUS requests to the

device will return a logic 0 for the self–powered bit field.

6. The DS4201 does not set the Halt field for the default or isochronous endpoints nor does it accept the

SET_FEATURE ENDPOINT_HALT command for the default or isochronous endpoints. Therefore

the Halt field for GET_STATUS requests to endpoints will always return a value of zero.

7. There is no USB core level status information defined for interfaces. The DS4201 will always return

zero value data for GET_STATUS requests to interfaces.

USB ADC CLASS REQUESTS

DS4201 SUPPORTED USB ADC AUDIO STREAMING REQUESTS

TARGET

ELEMENT

REQUESTS

CONTROL

VALID SETTINGS

DESCRIPTION

SET_CUR

Set sampling freq

for audio data

Endpoint 1

GET_CUR

SAMPLING_FREQ_

CONTROL

0x00AC44 (44.1 KHz)

0x00BB80 (48.0 KHz)

Get sampling freq

for audio data