VS1103B datasheet(26/61 Pages) ETC2

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VLSI

Solution

VS1103b

VS1103B

6. FUNCTIONAL DESCRIPTION

6.3 Data Flow of VS1103b

6.3.1 Normal Data Flow

Buffer 1

Buffer 2

Mixer

Gain 2

Gain 3

Gain 1

Audio stream

SCI

Buffer 3

* Only one MIDI and one ADPCM stream may be active at the time

**UART can only be used for real−time MIDI

SM_RECORD_PATH=1

encode

ADPCM

SM_ADPCM=1

SM_RECORD_PATH=0

GAIN3 != 0

UART

SCI

SDI

ADPCM stream

MIDI stream

Stream 4

SM_ICONF

AGC/Gain 4

A/D stream

A/D

44.1 kHz

8 kHz

Figure 12: Normal Data Flow of VS1103b, Part 1.

Generation of the Audio stream and recording A/D stream is presented in Figure 12.

Stream 1, which is the MIDI stream, may be fed either through SDI, SCI or UART. If it is fed through

UART, real-time MIDI, or RT-MIDI is assumed. The buffer size is 1024 bytes.

Stream 2, which is the ADPCM stream, may be fed either through SDI or SCI. The buffer size is 1024

bytes.

Stream 3, which is the A/D stream, running always at 8 kHz, is active if register SM ADPCM is set.

The outputs of the three streams are forwarded to the Mixer, which resamples all data to 44.1 kHz, and

forwards the data.

Either one of the A/D stream and the output of the Mixer can be fed to ADPCM encoding. If the data

is read from the A/D stream, it will be encoded as 8 kHz mono and if it is read from the Mixer, it will

encode as 44.1 kHz mono. The ADPCM compressed data may be read from SCI registers SCI IN0 and

SCI IN1. The buffer size is 1024 bytes.

Version 1.01, 2007-09-03

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