at85c51snd3b ATMEL Corporation, at85c51snd3b Datasheet - Page 149

• Manufacturer Part Number: at85c51snd3b
• Description: Single-chip Digital Audio Decoder - Encoder With Usb 2.0 Interface
• Manufacturer: ATMEL Corporation

Audio Controller
Clock Generator
Audio Processor
7632C–MP3–11/06
The Audio Controller implemented in AT85C51SND3B derivatives is based on four func-
tional blocks detailed in the following sections:
•
•
•
•
Figure 69. Audio Controller Block Diagram
The clock generator generates the audio controller clocks based on the audio clock
issued by the clock controller as detailed in Section “System Clock Generator”, page 30.
As shown in Figure 70, it contains an Audio Frequencies Generator able to generate the
audio sampling and over-sampling frequencies fed by a normalized clock. This genera-
tor is based on a PLL and is entirely controlled by the audio processor depending on the
encoded or decoded audio stream characteristics.
Figure 70. Audio Controller Clock Generator
The audio processor is based on three functional blocks as shown in Figure 71.
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•
•
The Clock Generator
The Audio Processor
The Audio Codec
The Audio DAC Interface
The Audio Buffer
The Digital Audio Processor
The Baseband Processor
CLOCK
CPU
DFC
Bus
Bus
AUD
CLOCK
AUD
ACCKEN
AUCON.0
Audio Processor
Generator
Clock
Normalizing
Clock
Audio Frequencies
Audio Codec
AT85C51SND3B
Audio DAC
Generator
Interface
OCLK
DCLK
DDAT
DSEL
MICBIAS
MICIN
LINR
LINL
OUTR
OUTL
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