PCM2903C

SBFS038A – JUNE 2012 – REVISED SEPTEMBER 2015

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Feature Description (continued)

9.3.5 Channel Status Information

The channel status information is fixed as consumer application, PCM mode, copyright, and digital/digital

converter. All other bits are fixed as 0's except for the sample frequency, which is set automatically according to

the data received through the USB.

9.3.6 Copyright Management

Isochronous-in data are affected by the serial copy management system (SCMS). When the control bit indicates

that the received digital audio data are original, the input digital audio data are transferred to the host. If the data

are indicated as first generation or higher, the transferred data are routed to the analog input.

Digital audio data output is always encoded as original with SCMS control.

9.4 Device Functional Modes

The PCM2903C is a USB controlled device. The PCM2903C is a codec, so it has analog input (that goes to an

A/D converter) and analog output (that comes from a D/A converter), alongside of the digital path that goes to

USB and S/PDIF. A wider explanation of these operational modes is in Programming.

9.5 Programming

9.5.1 USB Interface

Control data and audio data are transferred to the PCM2903C via D+ (pin 1) and D– (pin 2). All data to and from

the PCM2903C are transferred at full speed. The device descriprtor contains the information described in

Table 1.

Table 1. Device Descriptor

USB revision

2.0 compliant

Device class

0x00 (device-defined interface level)

Device subclass

0x00 (not specified)

Device protocol

0x00 (not specified)

Max packet size for end-point 0

8 bytes

Vendor ID

0x08BB

Product ID

0x29C3

Device release number

1.0 (0x0100)

Number of configurations

1

Vendor strings

String number 1 (see Table 3)

Product strings

String number 2 (see Table 3)

Serial number

Not supported

The configuration descriptor contains the information described in Table 2.

Table 2. Configuration Descriptor

Interface

Four interfaces

Power attribute

0xC0 (self-powered, no remote wakeup)

Maximum power

0x0A (20 mA)

18

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