Audio Interface - Bose Companion 5 Service Manual

USB Input
6
D-
U6000
D+ 7
TAS1020B
USB Controller and
Microprocessor
5V 25
Audio clock
master
26
Q6101
REMOTE
MUTE
TOUCH
SENSOR
Volume
Aux In
Headphone

Audio interface

Time Division Multiplexing (TDM) is used to transfer audio data among the USB controller (U6000), DSP (U7000)
and CODEC (U4000). The USB controller is the clock master for the TDM paths. Only one clock domain exists
for exchange of audio information. The USB controller is responsible for synchronizing the local TDM data rate
with the data rate from the USB host, when the host is active. When no host is connected, or when the con-
nected host is suspended, the USB controller is responsible to provide the clocks for the TDM paths at a
nominal 48kHz audio sample rate. No audio data is transferred to the host computer. Additional details of the
TDM audio paths are described later in this document.
U6000.35 sources the frame clock for the TDM paths.
U6000.37 sources the bit clock.
U6000.38 sources the USB audio data received from the USB host.
Serial Interface
The components to support a Boselink hardware compatible serial interface are not installed.
Audio Interface
3.3V
38
EEPROM
I2C Bus
31 138
BADDATA
30
127
DSPINT
RAMP
GENERATOR
VRAW
Bass Knob
U1000
EEPROM
3.3V 1.2V
I2C Bus
135
131
McASPs
134
U7000
122
TI DSP
TMS320DA710
126
Audio clock
slave
113 115 116
120 119
Q6202
Q6203
12
5V 3.3V
9 6
CCLIP
27
DACs
ADCs
BSCLIP
28
U4000
WM8772 or AK4626 o 25
CODEC D
23
26
24
Audio clock
slave
Thermistor
RT6307
Thermistor
RT6206
Audio Path
Out to
Amplifier