AnalogOut

AnalogIn

Endpoint#0

DefaultEndpoint

Endpoint#1

(IF#1)

AudioStreamingInterface

Endpoint#1

(IF#1)

AudioStreamingInterface

IT

TID3

S

UID4

OT

TIDB

S

UIDA

Standard AudioControlInterface(IF#0)

OT

TID6

IT

TID7

IT

TID1

UID5

FU

UID2

FU

UID8

FU

PCM2912A

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SLES230A – SEPTEMBER 2008 – REVISED AUGUST 2015

9.5.1.1 Device Configuration

Figure 36 illustrates the USB audio function topology. The PCM2912A has three interfaces. Each interface is

constructed with some alternative settings.

Figure 36. USB Audio Function Topology

9.5.1.2 Interface #0

Interface #0 is the control interface. Alternative setting #0 is the only possible setting for interface #0. Alternative

setting #0 describes the standard audio control interface. The audio control interface is constructed with a series

of terminal connections. The PCM2912A has the following 10 terminals:

•

Input terminal (Terminal ID#1) for audio analog input for sidetone

•

Feature unit (Unit ID#2) for sidetone PGA

•

Input terminal (Terminal ID#3) for isochronous out stream

•

Mixer unit (Unit ID#4) for sidetone mixing

•

Feature unit (Unit ID#5) for analog output PGA

•

Output terminal (Terminal ID#6) for audio analog output

•

Input terminal (Terminal ID#7) for audio analog input

•

Feature unit (Unit ID#8) for analog input PGA

•

Mixer unit (Unit ID#A) for analog input

•

Output terminal (Terminal ID#B) for isochronous in stream

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