VS1103 datasheet(27/61 Pages) VLSI

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VS1103b Datasheet

FUNCTIONAL DESCRIPTION

Volume

control

Audio

FIFO

S.rate.conv

and DAC

SCI_VOL

512 stereo

samples

application

User

Bass

enhancer

AIADDR=0

SB_AMPLITUDE!=0

AIADDR!=0

stream

Audio

enhancer

Treble

ST_AMPLITUDE!=0

ST_AMPLITUDE=0

ST_EARSPEAKER=0

ST_EARSPEAKER!=0

Earspeaker

SB_AMPLITUE=0

Figure 13: Normal Data Flow of VS1103b, Part 2.

Figure 13 presents the data ﬂow of the Audio stream generated in Figure 12.

If SCI_AIADDR is non-zero, application code is executed from the address pointed to by that

Then data may be sent to the Bass and Treble Enhancer depending on the SCI_BASS register,

followed by Earspeaker Spatial Processing, depending on ST_EARSPEAKER.

After that the signal is fed to the volume control unit, which also copies the data to the Audio

FIFO.

The Audio FIFO holds the data, which is read by the Audio interrupt (Chapter 8.13.1) and fed

to the sample rate converter and DACs. The size of the audio FIFO is 1024 stereo (2×16-bit)

samples, or 4 KiB.

The sample rate converter converts all different sample rates to XTALI/2, or 128 times the

highest usable sample rate. This removes the need for complex PLL-based clocking schemes

and allows almost unlimited sample rate accuracy with one ﬁxed input clock frequency. With

a 12.288 MHz clock, the DA converter operates at 128 × 48 kHz, i.e. 6.144 MHz, and creates

a stereo in-phase analog signal. The oversampled output is low-pass ﬁltered by an on-chip

analog ﬁlter. This signal is then forwarded to the earphone ampliﬁer.

6.3.2

Real-Time RT-Midi Mode

If GPIO1 is 1 and GPIO0 is 0 at startup, RT-Midi Mode is activated. In this mode RT-Midi data

is read through the UART at the default MIDI speed 31250 bit/s. The generated audio is sent

to the audio path as shown in Figure 13.

When RT-MIDI mode is activated, GPIO2 and GPIO3 are read and their contents are copied

to register bits SCIMB_EARSPEAKER0 and SCIMB_EARSPEAKER1, respectively. This way

it is possible to activate EarSpeaker in this mode without writing to any SCI registers. Also, if

SCI_CLOCKF has not been set to a non-zero value, the clock multiplier is automatically set to

3.5X.

This mode is intended for connecting a MIDI keyboard or sequencer to VS1103b.

Version: 1.04, 2018-03-16

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