VS1001K datasheet(21/40 Pages) ETC2

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DATASHEET

VS1001K

6. FUNCTIONAL DESCRIPTION

Functional Description

6.1

Main Features

VS1001k is based on a proprietary digital signal processor, VS DSP. It contains all the code and data

memory needed for MPEG audio decoding, together with serial interfaces, a multirate stereo audio DAC

and analog output ampliﬁers and ﬁlters.

VS1001k can play all MPEG 1 and 2 layer 3 ﬁles, as well as so-called MPEG 2.5 layer 3 extension

ﬁles with all sample rates and bitrates. In addition, variable bitrate (VBR) is also supported. With

VBR, and depending on the song, near-cd quality can be achieved with approximately 100 kbits/s for

stereo music sampled at 44100 Hz, whereas old encoders required 128 kbits/s for the same task. As

both commercial and free (http://www.mp3dev.org/) high-quality VBR encoders are nowadays widely

available, MP3 format is getting better as it is maturing.

6.2

Data Flow of VS1001k

Bitstream

FIFO

MP1/2/3

decoding

Bass/treble

enhancer

Volume

control

Audio

FIFO

S.rate.conv.

and DAC

User

application

SM_BASS = 0

SM_BASS = 1

A1ADDR = 0

A1ADDR != 0

16384 bits

512 stereo

samples

SDI

VOL

Figure 11: Data Flow of VS1001k.

First, MP3 data is input through the SDI bus.

After decoding, data may be sent to the Bass/treble enhancer depending on SCI register MODE’s bit

SM BASS.

Then, if SCI register AIADDR is non-zero, application code is executed from the address pointed to by

AIADDR. For more details, see Chapters 6.5.10 and Application Notes for VS10XX.

After the optional user application, the signal is fed to the volume control unit, which also copies the

data to the Audio FIFO.

The Audio FIFO holds the data that is read by the Audio interrupt (Chapter 8.5.1) and fed to the sample

rate converter and DACs. The size of the audio FIFO is 512 stereo (2×16-bit) samples

The sample rate converter converts all different sample rates to CLKI/512 and feeds the data to the DAC,

which in order makes a stereo in-phase signal. This signal is then forwarded to the earphone ampliﬁer.

Version 4.14,

2004-02-10

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