ETC VS1033

VS1033 A
VS1033a PRELIMINARY
VS1033 - MP3/AAC/WMA/MIDI
AUDIO CODEC
Features
Description
• Decodes MPEG 1 & 2 audio layer III (CBR
+VBR +ABR); layers I & II optional;
MPEG4 / 2 AAC-LC-2.0.0.0 (+PNS);
WMA 4.0/4.1/7/8/9 all profiles (5-384 kbps);
WAV (PCM + IMA ADPCM);
General MIDI / SP-MIDI format 0 files
• Encodes IMA ADPCM from microphone
or line input
• Streaming support for MP3 and WAV
• Bass and treble controls
• Operates with a single clock 12..13 MHz.
• Can also be used with 24..26 MHz clocks.
• Internal PLL clock multiplier
• Low-power operation
• High-quality on-chip stereo DAC with no
phase error between channels
• Stereo earphone driver capable of driving a
30Ω load
• I2S interface for external DAC
• Separate operating voltages for analog, digital and I/O
• 5.5 KiB On-chip RAM for user code / data
• Serial control and data interfaces
• Can be used as a slave co-processor
• SPI flash boot for special applications
• UART for debugging purposes
• New functions may be added with software
and 8 GPIO pins
• Lead-free RoHS-compliant package (Green)
VS1033 is a single-chip MP3/AAC/WMA/MIDI
audio decoder and ADPCM encoder. It contains
a high-performance, proprietary low-power DSP
processor core VS DSP4 , working data memory,
5 KiB instruction RAM and 0.5 KiB data RAM
for user applications, serial control and input data
interfaces, upto 8 general purpose I/O pins, an
UART, as well as a high-quality variable-samplerate mono ADC and stereo DAC, followed by an
earphone amplifier and a ground buffer.
VS1033 receives its input bitstream through a serial input bus, which it listens to as a system slave.
The input stream is decoded and passed through a
digital volume control to an 18-bit oversampling,
multi-bit, sigma-delta DAC. The decoding is controlled via a serial control bus. In addition to the
basic decoding, it is possible to add application
specific features, like DSP effects, to the user RAM
memory.
I2S
mic
audio
line
audio
GPIO
VS1033
MIC AMP
MUX
audio
Mono
ADC
Stereo
DAC
Stereo Ear−
phone Driver
L
R
output
8
GPIO
X ROM
DREQ
SO
SI
SCLK
XCS
Serial
Data/
Control
Interface
X RAM
4
VSDSP
XDCS
Y ROM
RX
TX
UART
Clock
multiplier
Version 0.6,
2005-01-05
Y RAM
Instruction
RAM
Instruction
ROM
1
VLSI
VS1033a PRELIMINARY
y
Solution
VS1033 A
CONTENTS
Contents
1
Licenses
9
2
Disclaimer
9
3
Definitions
9
4
Characteristics & Specifications
10
4.1
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
4.2
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
4.3
Analog Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
4.4
Power Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
4.5
Digital Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
4.6
Switching Characteristics - Boot Initialization . . . . . . . . . . . . . . . . . . . . . . .
12
5
Packages and Pin Descriptions
13
5.1
Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
5.1.1
LQFP-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
5.1.2
BGA-49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
LQFP-48 and BGA-49 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . .
14
5.2
6
Connection Diagram, LQFP-48
16
7
SPI Buses
17
7.1
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
7.2
SPI Bus Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
7.2.1
17
Version 0.6,
2005-01-05
VS1002 Native Modes (New Mode) . . . . . . . . . . . . . . . . . . . . . . . .
2
VLSI
VS1033a PRELIMINARY
y
Solution
7.2.2
CONTENTS
VS1001 Compatibility Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
7.3
Data Request Pin DREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
7.4
Serial Protocol for Serial Data Interface (SDI) . . . . . . . . . . . . . . . . . . . . . . .
18
7.4.1
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
7.4.2
SDI in VS1002 Native Modes (New Mode) . . . . . . . . . . . . . . . . . . . .
18
7.4.3
SDI in VS1001 Compatibility Mode . . . . . . . . . . . . . . . . . . . . . . . .
19
7.4.4
Passive SDI Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
Serial Protocol for Serial Command Interface (SCI) . . . . . . . . . . . . . . . . . . . .
19
7.5.1
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
7.5.2
SCI Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20
7.5.3
SCI Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20
7.6
SPI Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
7.7
SPI Examples with SM SDINEW and SM SDISHARED set . . . . . . . . . . . . . . .
22
7.7.1
Two SCI Writes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
7.7.2
Two SDI Bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
7.7.3
SCI Operation in Middle of Two SDI Bytes . . . . . . . . . . . . . . . . . . . .
23
7.5
8
VS1033 A
Functional Description
24
8.1
Main Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24
8.2
Supported Audio Codecs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24
8.2.1
Supported MP3 (MPEG layer III) Formats . . . . . . . . . . . . . . . . . . . .
24
8.2.2
Supported MP1 (MPEG layer I) Formats . . . . . . . . . . . . . . . . . . . . .
25
8.2.3
Supported MP2 (MPEG layer II) Formats . . . . . . . . . . . . . . . . . . . . .
25
8.2.4
Supported AAC (ISO/IEC 13818-7) Formats . . . . . . . . . . . . . . . . . . .
26
8.2.5
Supported WMA Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27
Version 0.6,
2005-01-05
3
VLSI
VS1033a PRELIMINARY
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Solution
9
VS1033 A
CONTENTS
8.2.6
Supported RIFF WAV Formats . . . . . . . . . . . . . . . . . . . . . . . . . . .
28
8.2.7
Supported MIDI Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29
8.3
Data Flow of VS1033 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
8.4
Serial Data Interface (SDI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
8.5
Serial Control Interface (SCI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
8.6
SCI Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
8.6.1
SCI MODE (RW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32
8.6.2
SCI STATUS (RW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34
8.6.3
SCI BASS (RW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34
8.6.4
SCI CLOCKF (RW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35
8.6.5
SCI DECODE TIME (RW) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36
8.6.6
SCI AUDATA (RW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36
8.6.7
SCI WRAM (RW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36
8.6.8
SCI WRAMADDR (W) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36
8.6.9
SCI HDAT0 and SCI HDAT1 (R) . . . . . . . . . . . . . . . . . . . . . . . . .
37
8.6.10 SCI AIADDR (RW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
38
8.6.11 SCI VOL (RW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
38
8.6.12 SCI AICTRL[x] (RW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39
Operation
40
9.1
Clocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
40
9.2
Hardware Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
40
9.3
Software Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
40
9.4
ADPCM Recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
41
9.4.1
41
Version 0.6,
2005-01-05
Activating ADPCM mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
VLSI
VS1033a PRELIMINARY
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Solution
VS1033 A
CONTENTS
9.4.2
Reading IMA ADPCM Data . . . . . . . . . . . . . . . . . . . . . . . . . . . .
41
9.4.3
Adding a RIFF Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
42
9.4.4
Playing ADPCM Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
43
9.4.5
Sample Rate Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . .
43
9.4.6
Example Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
43
9.5
SPI Boot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
45
9.6
Play/Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
45
9.7
Feeding PCM data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
45
9.8
Extra Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
46
9.8.1
Common Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
47
9.8.2
WMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
47
9.8.3
AAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
48
9.8.4
Midi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
48
Fast Forward / Rewind . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
49
9.9.1
MP3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
49
9.9.2
AAC - ADTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
49
9.9.3
AAC - ADIF, MP4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
49
9.9.4
WMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50
9.9.5
Midi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50
9.10 SDI Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51
9.10.1 Sine Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51
9.10.2 Pin Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51
9.10.3 Memory Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
52
9.10.4 SCI Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
52
9.9
Version 0.6,
2005-01-05
5
VLSI
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Solution
VS1033a PRELIMINARY
VS1033 A
CONTENTS
10 VS1033 Registers
53
10.1 Who Needs to Read This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
53
10.2 The Processor Core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
53
10.3 VS1033 Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
53
10.4 SCI Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
53
10.5 Serial Data Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
53
10.6 DAC Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
54
10.7 GPIO Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
55
10.8 Interrupt Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
56
10.9 A/D Modulator Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
57
10.10Watchdog v1.0 2002-08-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
58
10.10.1 Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
58
10.11UART v1.1 2004-10-09 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
59
10.11.1 Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
59
10.11.2 Status UARTx STATUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
59
10.11.3 Data UARTx DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
60
10.11.4 Data High UARTx DATAH . . . . . . . . . . . . . . . . . . . . . . . . . . . .
60
10.11.5 Divider UARTx DIV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
60
10.11.6 Interrupts and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
61
10.12Timers v1.0 2002-04-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
62
10.12.1 Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
62
10.12.2 Configuration TIMER CONFIG . . . . . . . . . . . . . . . . . . . . . . . . . .
62
10.12.3 Configuration TIMER ENABLE . . . . . . . . . . . . . . . . . . . . . . . . . .
63
10.12.4 Timer X Startvalue TIMER Tx[L/H] . . . . . . . . . . . . . . . . . . . . . . .
63
Version 0.6,
2005-01-05
6
VLSI
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Solution
VS1033a PRELIMINARY
VS1033 A
CONTENTS
10.12.5 Timer X Counter TIMER TxCNT[L/H] . . . . . . . . . . . . . . . . . . . . . .
63
10.12.6 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
63
10.13I2S DAC Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
64
10.13.1 Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
64
10.13.2 Configuration I2S CONFIG . . . . . . . . . . . . . . . . . . . . . . . . . . . .
64
10.14System Vector Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
65
10.14.1 AudioInt, 0x20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
65
10.14.2 SciInt, 0x21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
65
10.14.3 DataInt, 0x22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
65
10.14.4 ModuInt, 0x23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
65
10.14.5 TxInt, 0x24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
66
10.14.6 RxInt, 0x25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
66
10.14.7 Timer0Int, 0x26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
66
10.14.8 Timer1Int, 0x27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
66
10.14.9 UserCodec, 0x0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
67
10.15System Vector Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
67
10.15.1 WriteIRam(), 0x2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
67
10.15.2 ReadIRam(), 0x4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
67
10.15.3 DataBytes(), 0x6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
67
10.15.4 GetDataByte(), 0x8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
68
10.15.5 GetDataWords(), 0xa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
68
10.15.6 Reboot(), 0xc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
68
11 Document Version Changes
11.1 Version 0.6 for VS1033a, 2005-01-05 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Version 0.6,
2005-01-05
69
69
7
VLSI
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Solution
VS1033a PRELIMINARY
VS1033 A
LIST OF FIGURES
11.2 Version 0.5, 2005-10-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12 Contact Information
69
70
List of Figures
1
Pin Configuration, LQFP-48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
2
Pin Configuration, BGA-49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
3
Typical Connection Diagram Using LQFP-48. . . . . . . . . . . . . . . . . . . . . . . .
16
4
BSYNC Signal - one byte transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
5
BSYNC Signal - two byte transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
6
SCI Word Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20
7
SCI Word Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20
8
SPI Timing Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
9
Two SCI Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
10
Two SDI Bytes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
11
Two SDI Bytes Separated By an SCI Operation. . . . . . . . . . . . . . . . . . . . . . .
23
12
Data Flow of VS1033. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
13
ADPCM Frequency Responses with 8 kHz sample rate. . . . . . . . . . . . . . . . . . .
33
14
User’s Memory Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
54
15
RS232 Serial Interface Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
59
16
I2S Interface, 192 kHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
64
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Solution
1
VS1033 A
1. LICENSES
Licenses
MPEG Layer-3 audio decoding technology licensed from Fraunhofer IIS and Thomson.
Note: if you enable Layer I and Layer II decoding, you are liable for any patent issues that may
arise from using these formats. Joint licensing of MPEG 1.0 / 2.0 Layer III does not cover all patents
pertaining to layers I and II.
VS1033 contains WMA decoding technology from Microsoft.
This product is protected by certain intellectual property rights of Microsoft and cannot be used
or further distributed without a license from Microsoft.
VS1033 contains AAC technology (ISO/IEC 13818-7) which cannot be used without a proper license
from Via Licensing Corporation or individual patent holders.
To the best of our knowledge, if the end product does not play a specific format that otherwise would
require a customer license: MPEG 1.0/2.0 layers I and II, WMA, or AAC, the respective license should
not be required. Decoding of MPEG layers I and II are disabled by default, and WMA and AAC format
exclusion can be easily performed based on the contents of the SCI HDAT1 register.
2
Disclaimer
This is a preliminary datasheet. All properties and figures are subject to change.
3
Definitions
B Byte, 8 bits.
b Bit.
Ki “Kibi” = 210 = 1024 (IEC 60027-2).
Mi “Mebi” = 220 = 1048576 (IEC 60027-2).
VS DSP VLSI Solution’s DSP core.
W Word. In VS DSP, instruction words are 32-bit and data words are 16-bit wide.
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Solution
4
VS1033a PRELIMINARY4. CHARACTERISTICS & SPECIFICATIONS
Characteristics & Specifications
4.1
Absolute Maximum Ratings
Parameter
Analog Positive Supply
Digital Positive Supply
I/O Positive Supply
Current at Any Digital Output
Voltage at Any Digital Input
Operating Temperature
Storage Temperature
1
Symbol
AVDD
CVDD
IOVDD
Min
-0.3
-0.3
-0.3
-0.3
-40
-65
Max
3.6
2.7
3.6
±50
IOVDD+0.31
+85
+150
Unit
V
V
V
mA
V
◦C
◦C
Must not exceed 3.6 V
4.2
Recommended Operating Conditions
Parameter
Ambient Operating Temperature
Analog and Digital Ground 1
Positive Analog
Positive Digital
I/O Voltage
Input Clock Frequency2
Internal Clock Frequency
Internal Clock Multiplier3
Master Clock Duty Cycle
Symbol
AGND DGND
AVDD
CVDD
IOVDD
XTALI
CLKI
Min
-40
2.5
2.4
CVDD-0.6V
12
12
1.0×
40
Typ
0.0
2.8
2.5
2.8
12.288
36.864
3.0×
50
Max
+85
3.6
2.7
3.6
13
55.3
4.5×
60
Unit
◦C
V
V
V
V
MHz
MHz
%
1
Must be connected together as close the device as possible for latch-up immunity.
The maximum sample rate that can be played with correct speed is XTALI/256.
Thus, XTALI must be at least 12.288 MHz to be able to play 48 kHz at correct speed.
3 Reset value is 1.0×. Recommended SC MULT=3.0×, SC ADD=1.0× (SCI CLOCKF=0x9000).
2
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4.3
VS1033a PRELIMINARY4. CHARACTERISTICS & SPECIFICATIONS
Analog Characteristics
Unless otherwise noted: AVDD=2.5..2.85V, CVDD=2.4..2.7V, IOVDD=CVDD-0.6V..3.6V, TA=-40..+85◦ C,
XTALI=12..13MHz, Internal Clock Multiplier 3.5×. DAC tested with 1307.894 Hz full-scale output
sinewave, measurement bandwidth 20..20000 Hz, analog output load: LEFT to GBUF 30Ω, RIGHT to
GBUF 30Ω. Microphone test amplitude 50 mVpp, fs =1 kHz, Line input test amplitude 1.1 V, fs =1 kHz.
Parameter
DAC Resolution
Total Harmonic Distortion
Dynamic Range (DAC unmuted, A-weighted)
S/N Ratio (full scale signal)
Interchannel Isolation (Cross Talk)
Interchannel Isolation (Cross Talk), with GBUF
Interchannel Gain Mismatch
Frequency Response
Full Scale Output Voltage (Peak-to-peak)
Deviation from Linear Phase
Analog Output Load Resistance
Analog Output Load Capacitance
Microphone input amplifier gain
Microphone input amplitude
Microphone Total Harmonic Distortion
Microphone S/N Ratio
Line input amplitude
Line input Total Harmonic Distortion
Line input S/N Ratio
Line and Microphone input impedances
Symbol
THD
IDR
SNR
Min
70
50
-0.5
-0.1
1.3
AOLR
16
Typ
18
0.1
90
Max
0.3
75
40
1.51
0.5
0.1
1.7
5
302
100
MICG
MTHD
MSNR
LTHD
LSNR
50
60
26
50
0.02
62
2200
0.06
68
100
1403
0.10
28003
0.10
Unit
bits
%
dB
dB
dB
dB
dB
dB
Vpp
◦
Ω
pF
dB
mVpp AC
%
dB
mVpp AC
%
dB
kΩ
1
3.0 volts can be achieved with +-to-+ wiring for mono difference sound.
AOLR may be much lower, but below Typical distortion performance may be compromised.
3 Above typical amplitude the Harmonic Distortion increases.
2
4.4 Power Consumption
Tested with an MPEG 1.0 Layer-3 128 kbps sample and generated sine. Output at full volume. Internal
clock multiplier 3.0×.
Parameter
Power Supply Consumption AVDD, Reset
Power Supply Consumption CVDD = 2.5V, Reset
Power Supply Consumption AVDD, sine test, 30Ω + GBUF
Power Supply Consumption CVDD = 2.5V, sine test
Power Supply Consumption AVDD, no load
Power Supply Consumption AVDD, output load 30Ω
Power Supply Consumption AVDD, 30Ω + GBUF
Power Supply Consumption CVDD = 2.5V
Version 0.6,
2005-01-05
Min
Typ
0.6
3.7
36.9
8.2
7.0
10.9
16.1
14
Max
5.0
50.0
Unit
µA
µA
mA
mA
mA
mA
mA
mA
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Solution
4.5
VS1033a PRELIMINARY4. CHARACTERISTICS & SPECIFICATIONS
Digital Characteristics
Parameter
High-Level Input Voltage
Low-Level Input Voltage
High-Level Output Voltage at IO = -2.0 mA
Low-Level Output Voltage at IO = 2.0 mA
Input Leakage Current
SPI Input Clock Frequency 2
Rise time of all output pins, load = 50 pF
1
2
Symbol
Must not exceed 3.6V
Value for SCI reads. SCI and SDI writes allow
Min
0.7×IOVDD
-0.2
0.7×IOVDD
Typ
Max
IOVDD+0.31
0.3×IOVDD
0.3×IOVDD
1.0
-1.0
CLKI
6
50
Unit
V
V
V
V
µA
MHz
ns
CLKI
4 .
4.6 Switching Characteristics - Boot Initialization
Parameter
XRESET active time
XRESET inactive to software ready
Power on reset, rise time to CVDD
1
Symbol
Min
2
16600
10
Max
500001
Unit
XTALI
XTALI
V/s
DREQ rises when initialization is complete. You should not send any data or commands before that.
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5
VS1033a PRELIMINARY
VS1033 A
5. PACKAGES AND PIN DESCRIPTIONS
Packages and Pin Descriptions
5.1
Packages
Both LPQFP-48 and BGA-49 are lead (Pb) free and also RoHS compliant packages. RoHS is a short
name of Directive 2002/95/EC on the restriction of the use of certain hazardous substances in electrical
and electronic equipment.
5.1.1
LQFP-48
48
1
Figure 1: Pin Configuration, LQFP-48.
LQFP-48 package dimensions are at http://www.vlsi.fi/ .
5.1.2
BGA-49
A1 BALL PAD CORNER
1
2
4
3
5
6
7
A
D
4.80
0.80 TYP
C
7.00
B
E
F
G
0.80 TYP
4.80
1.10 REF
1.10 REF
7.00
TOP VIEW
Figure 2: Pin Configuration, BGA-49.
BGA-49 package dimensions are at http://www.vlsi.fi/ .
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5.2
5. PACKAGES AND PIN DESCRIPTIONS
LQFP-48 and BGA-49 Pin Descriptions
Pin Name
LQFP
Pin
1
2
3
BGA
Ball
C3
C2
B1
Pin
Type
AI
AI
DI
DGND0
CVDD0
IOVDD0
CVDD1
DREQ
GPIO2 / DCLK1
GPIO3 / SDATA1
GPIO6
GPIO7
XDCS / BSYNC1
IOVDD1
VCO
DGND1
XTALO
XTALI
IOVDD2
IOVDD3
DGND2
DGND3
DGND4
XCS
CVDD2
GPIO5 / I2S MCLK3
RX
TX
SCLK
SI
SO
CVDD3
TEST
GPIO0 / I2S SCLK3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
D2
C1
D3
D1
E2
E1
F2
F1
G1
E3
F3
G2
F4
G3
E4
G4
F5
20
21
22
23
24
25
26
27
28
29
30
31
32
33
G5
F6
G6
G7
E5
E6
F7
D6
E7
D5
D7
C6
C7
DGND
CPWR
IOPWR
CPWR
DO
DIO
DIO
DIO
DIO
DI
IOPWR
DO
DGND
AO
AI
IOPWR
IOPWR
DGND
DGND
DGND
DI
CPWR
DIO
DI
DO
DI
DI
DO3
CPWR
DI
DIO
GPIO1 / I2S SDATA3
GND
GPIO4 / I2S LROUT3
AGND0
AVDD0
RIGHT
AGND1
AGND2
GBUF
AVDD1
RCAP
AVDD2
LEFT
AGND3
LINEIN
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
B6
B7
A7
C5
B5
A6
B4
A5
C4
A4
B3
A3
B2
A2
A1
DIO
DGND
DIO
APWR
APWR
AO
APWR
APWR
AO
APWR
AIO
APWR
AO
APWR
AI
MICP
MICN
XRESET
Version 0.6,
VS1033 A
2005-01-05
Function
Positive differential microphone input, self-biasing
Negative differential microphone input, self-biasing
Active low asynchronous reset, schmitt-triggered
input
Core & I/O ground
Core power supply
I/O power supply
Core power supply
Data request, input bus
General purpose IO 2 / serial input data bus clock
General purpose IO 3 / serial data input
General purpose IO 6
General purpose IO 7
Data chip select / byte sync
I/O power supply
For testing only (Clock VCO output)
Core & I/O ground
Crystal output
Crystal input
I/O power supply
I/O power supply
Core & I/O ground
Core & I/O ground
Core & I/O ground
Chip select input (active low)
Core power supply
General purpose IO 5 / I2S MCLK
UART receive, connect to IOVDD if not used
UART transmit
Clock for serial bus
Serial input
Serial output
Core power supply
Reserved for test, connect to IOVDD
General purpose IO 0 (SPIBOOT) / I2S SCLK
use 100 kΩ pull-down resistor2
General purpose IO 1 / I2S SDATA
I/O Ground
General purpose IO 4 / I2S LROUT
Analog ground, low-noise reference
Analog power supply
Right channel output
Analog ground
Analog ground
Ground buffer
Analog power supply
Filtering capacitance for reference
Analog power supply
Left channel output
Analog ground
Line input
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VS1033a PRELIMINARY
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Solution
VS1033 A
5. PACKAGES AND PIN DESCRIPTIONS
1
First pin function is active in New Mode, latter in Compatibility Mode.
2
Unless pull-down resistor is used, SPI Boot is tried. See Chapter 9.5 for details.
3
If I2S CF ENA is ’0’ the pins are used for GPIO. See Chapter 10.13 for details.
Pin types:
Type
DI
DO
DIO
DO3
AI
Description
Digital input, CMOS Input Pad
Digital output, CMOS Input Pad
Digital input/output
Digital output, CMOS Tri-stated Output Pad
Analog input
Type
AO
AIO
APWR
DGND
CPWR
IOPWR
Description
Analog output
Analog input/output
Analog power supply pin
Core or I/O ground pin
Core power supply pin
I/O power supply pin
In BGA-49, D4 is a no-connect ball.
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6
VS1033a PRELIMINARY
VS1033 A
6. CONNECTION DIAGRAM, LQFP-48
Connection Diagram, LQFP-48
Figure 3: Typical Connection Diagram Using LQFP-48.
The ground buffer GBUF can be used for common voltage (1.24 V) for earphones. This will eliminate
the need for large isolation capacitors on line outputs, and thus the audio output pins from VS1033 may
be connected directly to the earphone connector.
Unused GPIO pins should have a pull-down resistor.
If GBUF is not used, LEFT and RIGHT must be provided with 100 µF capacitors.
If UART is not used, RX should be connected to IOVDD and TX be unconnected.
Do not connect any external load to XTALO.
Note: This connection assumes SM SDINEW is active (see Chapter 8.6.1). If also SM SDISHARE is
used, xDCS should be tied low or high (see Chapter 7.2.1).
Version 0.6,
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7
VS1033 A
7. SPI BUSES
SPI Buses
7.1
General
The SPI Bus - that was originally used in some Motorola devices - has been used for both VS1033’s
Serial Data Interface SDI (Chapters 7.4 and 8.4) and Serial Control Interface SCI (Chapters 7.5 and 8.5).
7.2
SPI Bus Pin Descriptions
7.2.1
VS1002 Native Modes (New Mode)
These modes are active on VS1033 when SM SDINEW is set to 1 (default at startup). DCLK, SDATA
and BSYNC are replaced with GPIO2, GPIO3 and XDCS, respectively.
SDI Pin
XDCS
SCI Pin
XCS
SCK
SI
-
7.2.2
SO
Description
Active low chip select input. A high level forces the serial interface into
standby mode, ending the current operation. A high level also forces serial
output (SO) to high impedance state. If SM SDISHARE is 1, pin
XDCS is not used, but the signal is generated internally by inverting
XCS.
Serial clock input. The serial clock is also used internally as the master
clock for the register interface.
SCK can be gated or continuous. In either case, the first rising clock edge
after XCS has gone low marks the first bit to be written.
Serial input. If a chip select is active, SI is sampled on the rising CLK edge.
Serial output. In reads, data is shifted out on the falling SCK edge.
In writes SO is at a high impedance state.
VS1001 Compatibility Mode
This mode is active when SM SDINEW is set to 0. In this mode, DCLK, SDATA and BSYNC are active.
SDI Pin
-
SCI Pin
XCS
BSYNC
DCLK
SCK
SDATA
-
SI
SO
Version 0.6,
2005-01-05
Description
Active low chip select input. A high level forces the serial interface into
standby mode, ending the current operation. A high level also forces serial
output (SO) to high impedance state.
SDI data is synchronized with a rising edge of BSYNC.
Serial clock input. The serial clock is also used internally as the master
clock for the register interface.
SCK can be gated or continuous. In either case, the first rising clock edge
after XCS has gone low marks the first bit to be written.
Serial input. SI is sampled on the rising SCK edge, if XCS is low.
Serial output. In reads, data is shifted out on the falling SCK edge.
In writes SO is at a high impedance state.
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7.3
VS1033 A
7. SPI BUSES
Data Request Pin DREQ
The DREQ pin/signal is used to signal if VS1033’s FIFO is capable of receiving data. If DREQ is high,
VS1033 can take at least 32 bytes of SDI data or one SCI command. When these criteria are not met,
DREQ is turned low, and the sender should stop transferring new data.
Because of the 32-byte safety area, the sender may send upto 32 bytes of SDI data at a time without
checking the status of DREQ, making controlling VS1033 easier for low-speed microcontrollers.
Note: DREQ may turn low or high at any time, even during a byte transmission. Thus, DREQ should
only be used to decide whether to send more bytes. It should not abort a transmission that has already
started.
Note: In VS10XX products upto VS1002, DREQ was only used for SDI. In VS1003 and VS1033 DREQ
is also used to tell the status of SCI.
7.4
7.4.1
Serial Protocol for Serial Data Interface (SDI)
General
The serial data interface operates in slave mode so DCLK signal must be generated by an external circuit.
Data (SDATA signal) can be clocked in at either the rising or falling edge of DCLK (Chapter 8.6).
VS1033 assumes its data input to be byte-sychronized. SDI bytes may be transmitted either MSb or LSb
first, depending of contents of SCI MODE (Chapter 8.6.1).
The firmware is able to accept the maximum bitrate the SDI supports.
7.4.2
SDI in VS1002 Native Modes (New Mode)
In VS1002 native modes (SM NEWMODE is 1), byte synchronization is achieved by XDCS. The state of
XDCS may not change while a data byte transfer is in progress. To always maintain data synchronization
even if there may be glitches in the boards using VS1033, it is recommended to turn XDCS every now
and then, for instance once after every flash data block or a few kilobytes, just to keep sure the host and
VS1033 are in sync.
If SM SDISHARE is 1, the XDCS signal is internally generated by inverting the XCS input.
For new designs, using VS1002 native modes are recommended.
Version 0.6,
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Solution
7.4.3
VS1033 A
7. SPI BUSES
SDI in VS1001 Compatibility Mode
BSYNC
SDATA
D7
D6
D5
D4
D3
D2
D1
D0
DCLK
Figure 4: BSYNC Signal - one byte transfer.
When VS1033 is running in VS1001 compatibility mode, a BSYNC signal must be generated to ensure
correct bit-alignment of the input bitstream. The first DCLK sampling edge (rising or falling, depending
on selected polarity), during which the BSYNC is high, marks the first bit of a byte (LSB, if LSB-first
order is used, MSB, if MSB-first order is used). If BSYNC is ’1’ when the last bit is received, the receiver
stays active and next 8 bits are also received.
BSYNC
SDATA
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
DCLK
Figure 5: BSYNC Signal - two byte transfer.
7.4.4
Passive SDI Mode
If SM NEWMODE is 0 and SM SDISHARE is 1, the operation is otherwise like the VS1001 compatibility mode, but bits are only received while the BSYNC signal is ’1’. Rising edge of BSYNC is still
used for synchronization.
7.5 Serial Protocol for Serial Command Interface (SCI)
7.5.1
General
The serial bus protocol for the Serial Command Interface SCI (Chapter 8.5) consists of an instruction
byte, address byte and one 16-bit data word. Each read or write operation can read or write a single
register. Data bits are read at the rising edge, so the user should update data at the falling edge. Bytes
are always send MSb first. XCS should be low for the full duration of the operation, but you can have
pauses between bits if needed.
The operation is specified by an 8-bit instruction opcode. The supported instructions are read and write.
See table below.
Instruction
Name
Opcode
Operation
READ
0b0000 0011 Read data
WRITE 0b0000 0010 Write data
Note: VS1033 sets DREQ low after each SCI operation. The duration depends on the operation. It is not
allowed to start a new SCI/SDI operation before DREQ is high again.
Version 0.6,
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Solution
7.5.2
VS1033 A
7. SPI BUSES
SCI Read
XCS
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17
0
0
0
0
0
0
1
1
0
0
0
30 31
SCK
3
SI
instruction (read)
2
1
0
don’t care
0
data out
address
15 14
SO
0
0
0
0
0
0
0
0
0
0
0
0
0
don’t care
0
0
1
0
0
X
execution
DREQ
Figure 6: SCI Word Read
VS1033 registers are read from using the following sequence, as shown in Figure 6. First, XCS line is
pulled low to select the device. Then the READ opcode (0x3) is transmitted via the SI line followed by
an 8-bit word address. After the address has been read in, any further data on SI is ignored by the chip.
The 16-bit data corresponding to the received address will be shifted out onto the SO line.
XCS should be driven high after data has been shifted out.
DREQ is driven low for a short while when in a read operation by the chip. This is a very short time and
doesn’t require special user attention.
7.5.3
SCI Write
XCS
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17
SI
0
0
0
0
0
0
1
0
0
0
0
SO
0
0
0
0
0
0
0
30 31
SCK
3
instruction (write)
0
0
0
0
2
1
0
15 14
1
data out
address
0
0
X
0
0
0
0
0
0
0
0
0 X
execution
DREQ
Figure 7: SCI Word Write
VS1033 registers are written from using the following sequence, as shown in Figure 7. First, XCS line
is pulled low to select the device. Then the WRITE opcode (0x2) is transmitted via the SI line followed
by an 8-bit word address.
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Solution
VS1033 A
7. SPI BUSES
After the word has been shifted in and the last clock has been sent, XCS should be pulled high to end the
WRITE sequence.
After the last bit has been sent, DREQ is driven low for the duration of the register update, marked “execution” in the figure. The time varies depending on the register and its contents (see table in Chapter 8.6
for details). If the maximum time is longer than what it takes from the microcontroller to feed the next
SCI command or SDI byte, it is not allowed to finish a new SCI/SDI operation before DREQ has risen
up again.
7.6
SPI Timing Diagram
tWL
tXCSS
tWH
tXCSH
XCS
0
1
14
15
30
16
31
tXCS
SCK
SI
tH
tSU
SO
tZ
tV
tDIS
Figure 8: SPI Timing Diagram.
Symbol
tXCSS
tSU
tH
tZ
tWL
tWH
tV
tXCSH
tXCS
tDIS
1
Min
5
-26
2
0
2
2
Max
2 (+ 25ns1 )
-26
2
10
Unit
ns
ns
CLKI cycles
ns
CLKI cycles
CLKI cycles
CLKI cycles
ns
CLKI cycles
ns
25ns is when pin loaded with 100pF capacitance. The time is shorter with lower capacitance.
Note: As tWL and tWH, as well as tH require at least 2 clock cycles, the maximum speed for the SPI
bus that can easily be used is 1/6 of VS1033’s internal clock speed CLKI. Slightly higher speed can be
achieved with very careful timing tuning. For details, see Application Notes for VS10XX.
Note: Although the timing is derived from the internal clock CLKI, the system always starts up in 1.0×
mode, thus CLKI=XTALI.
Note: Negative numbers mean that the signal can change in different order from what is shown in the
diagram.
Version 0.6,
2005-01-05
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Solution
7.7
7.7.1
VS1033 A
7. SPI BUSES
SPI Examples with SM SDINEW and SM SDISHARED set
Two SCI Writes
SCI Write 1
SCI Write 2
XCS
0
1
2
3
30
31
1
0
32
33
61
62
63
2
1
0
SCK
SI
0
0
0
0
X
0
0
X
DREQ up before finishing next SCI write
DREQ
Figure 9: Two SCI Operations.
Figure 9 shows two consecutive SCI operations. Note that xCS must be raised to inactive state between
the writes. Also DREQ must be respected as shown in the figure.
7.7.2
Two SDI Bytes
SDI Byte 1
SDI Byte 2
XCS
0
1
2
3
7
6
5
4
6
7
8
9
1
0
7
6
13
14
15
2
1
0
SCK
3
SI
5
X
DREQ
Figure 10: Two SDI Bytes.
SDI data is synchronized with a raising edge of xCS as shown in Figure 10. However, every byte doesn’t
need separate synchronization.
Version 0.6,
2005-01-05
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VLSI
VS1033a PRELIMINARY
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Solution
7.7.3
VS1033 A
7. SPI BUSES
SCI Operation in Middle of Two SDI Bytes
SDI Byte
SDI Byte
SCI Operation
XCS
0
1
7
8
9
39
40
41
7
6
46
47
1
0
SCK
7
SI
6
5
1
0
0
5
X
0
DREQ high before end of next transfer
Figure 11: Two SDI Bytes Separated By an SCI Operation.
Figure 11 shows how an SCI operation is embedded in between SDI operations. xCS edges are used to
synchronize both SDI and SCI. Remember to respect DREQ as shown in the figure.
Version 0.6,
2005-01-05
23
VLSI
VS1033a PRELIMINARY
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Solution
8
VS1033 A
8. FUNCTIONAL DESCRIPTION
Functional Description
8.1
Main Features
VS1033 is based on a proprietary digital signal processor, VS DSP. It contains all the code and data
memory needed for MP3, AAC, WMA and WAV PCM + ADPCM audio decoding, MIDI synthesizer,
together with serial interfaces, a multirate stereo audio DAC and analog output amplifiers and filters.
Also ADPCM audio encoding is supported using a microphone amplifier and A/D converter. A UART
is provided for debugging purposes.
8.2 Supported Audio Codecs
Mark
+
-
8.2.1
Conventions
Description
Format is supported
Format exists but is not supported
Format doesn’t exist
Supported MP3 (MPEG layer III) Formats
MPEG 1.01 :
Samplerate / Hz
48000
44100
32000
32
+
+
+
40
+
+
+
48
+
+
+
56
+
+
+
64
+
+
+
80
+
+
+
Bitrate / kbit/s
96
112 128
+
+
+
+
+
+
+
+
+
160
+
+
+
192
+
+
+
224
+
+
+
256
+
+
+
320
+
+
+
8
+
+
+
16
+
+
+
24
+
+
+
32
+
+
+
40
+
+
+
48
+
+
+
Bitrate / kbit/s
56
64
80
+
+
+
+
+
+
+
+
+
96
+
+
+
112
+
+
+
128
+
+
+
144
+
+
+
160
+
+
+
8
+
+
+
16
+
+
+
24
+
+
+
32
+
+
+
40
+
+
+
48
+
+
+
Bitrate / kbit/s
56
64
80
+
+
+
+
+
+
+
+
+
96
+
+
+
112
+
+
+
128
+
+
+
144
+
+
+
160
+
+
+
MPEG 2.01 :
Samplerate / Hz
24000
22050
16000
MPEG 2.51 :
Samplerate / Hz
12000
11025
8000
1
Also all variable bitrate (VBR) formats are supported.
Version 0.6,
2005-01-05
24
VLSI
VS1033a PRELIMINARY
y
Solution
8.2.2
VS1033 A
8. FUNCTIONAL DESCRIPTION
Supported MP1 (MPEG layer I) Formats
Note: Layer I / II decoding must be specifically enabled from SCI MODE register.
MPEG 1.0:
Samplerate / Hz
48000
44100
32000
32
+
+
+
64
+
+
+
96
+
+
+
128
+
+
+
160
+
+
+
Bitrate / kbit/s
192 224 256 288
+
+
+
+
+
+
+
+
+
+
+
+
320
+
+
+
352
+
+
+
384
+
+
+
416
+
+
+
448
+
+
+
32
?
?
?
48
?
?
?
56
?
?
?
64
?
?
?
80
?
?
?
96
?
?
?
Bitrate / kbit/s
112 128 144
?
?
?
?
?
?
?
?
?
160
?
?
?
176
?
?
?
192
?
?
?
224
?
?
?
256
?
?
?
MPEG 2.0:
Samplerate / Hz
24000
22050
16000
8.2.3
Supported MP2 (MPEG layer II) Formats
Note: Layer I / II decoding must be specifically enabled from SCI MODE register.
MPEG 1.0:
Samplerate / Hz
48000
44100
32000
32
+
+
+
48
+
+
+
56
+
+
+
64
+
+
+
80
+
+
+
96
+
+
+
Bitrate / kbit/s
112 128 160
+
+
+
+
+
+
+
+
+
192
+
+
+
224
+
+
+
256
+
+
+
320
+
+
+
384
+
+
+
8
+
+
+
16
+
+
+
24
+
+
+
32
+
+
+
40
+
+
+
48
+
+
+
Bitrate / kbit/s
56
64
80
+
+
+
+
+
+
+
+
+
96
+
+
+
112
+
+
+
128
+
+
+
144
+
+
+
160
+
+
+
MPEG 2.0:
Samplerate / Hz
24000
22050
16000
Version 0.6,
2005-01-05
25
VLSI
VS1033a PRELIMINARY
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Solution
8.2.4
VS1033 A
8. FUNCTIONAL DESCRIPTION
Supported AAC (ISO/IEC 13818-7) Formats
VS1033 decodes MPEG2-AAC-LC-2.0.0.0 and MPEG4-AAC-LC-2.0.0.0 streams. This means that the
low complexity profile with maximum of two channels can be decoded. If a stream contains more than
one element and/or element type, you can select which one to decode from the 16 single-channel, 16
channel-pair, and 16 low-frequency elements. The default is to select the first one that appears in the
stream.
Dynamic range control (DRC) is supported and can be controlled by the user to limit or enhance the
dynamic range of the material that has DRC information.
Both Sine window and Kaiser-Bessel-derived window are supported.
For MPEG4 pseudo-random noise substitution (PNS) is supported. Short frames (120 and 960 samples)
are not supported.
For AAC the streaming ADTS format is recommended. This format allows easy rewind and fast forward
because resynchronization is easily possible.
In addition to ADTS (.aac), MPEG2 ADIF (.aac) and MPEG4 AUDIO (.mp4 / .m4a) files are played,
but these formats are less suitable for rewind and fast forward operations. You can still implement these
features by using the safe jump points table and seek mechanism provided, or using slightly less robust
but much easier automatic resync mechanism (see Section 9.9).
Note: To be able to play the .mp4 and .m4a files, the mdat chunk must be the last chunk in the file.
AAC12 :
Samplerate / Hz
48000
44100
32000
24000
22050
16000
12000
11025
8000
1
≤96
+
+
+
+
+
+
+
+
+
Maximum Bitrate kbit/s - for 2 channels
132 144 192 264 288 384 529
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
576
+
64000 Hz, 88200 Hz, and 96000 Hz AAC files are played but with wrong speed.
2
Also all variable bitrate (VBR) formats are supported. Note that the table gives the maximum bitrate
allowed for two channels for a specific sample rate as defined by the AAC specification. The decoder
does not actually have a lower or upper limit.
Version 0.6,
2005-01-05
26
VLSI
VS1033a PRELIMINARY
y
Solution
8.2.5
VS1033 A
8. FUNCTIONAL DESCRIPTION
Supported WMA Formats
Windows Media Audio codec versions 2, 7, 8, and 9 are supported. All WMA profiles (L1, L2, and L3)
are supported. Previously streams were separated into Classes 1, 2a, 2b, and 3. The decoder has passed
Microsoft’s conformance testing program.
WMA 4.0 / 4.1:
Samplerate
/ Hz
8000
11025
16000
22050
32000
44100
48000
5
+
6
+
8
+
+
10
+
+
12
+
16
20
Bitrate / kbit/s
22
32
40
+
+
+
+
+
+
+
+
+
+
+
+
48
64
80
96
128
160
192
+
+
+
+
+
+
+
+
+
+
48
64
80
96
128
160
192
+
+
+
+
+
+
+
+
+
+
48
64
80
96
128
160
192
+
+
+
+
+
+
+
+
+
+
+
WMA 7:
Samplerate
/ Hz
8000
11025
16000
22050
32000
44100
48000
5
+
6
+
8
+
+
10
+
+
12
+
16
20
+
+
+
+
+
+
Bitrate / kbit/s
22
32
40
+
+
+
+
+
WMA 8:
Samplerate
/ Hz
8000
11025
16000
22050
32000
44100
48000
5
+
6
+
8
+
+
10
+
+
12
+
16
20
+
+
+
+
+
+
Bitrate / kbit/s
22
32
40
+
+
+
+
+
WMA 9:
Samplerate
/ Hz
8000
11025
16000
22050
32000
44100
48000
5
+
6
+
8
+
+
10
+
+
12
+
16
20
+
+
+
+
+
+
+
22
+
Bitrate / kbit/s
32 40 48 64
80
96
128 160 192 256 320
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
In addition to these expected WMA decoding profiles, all other bitrate and samplerate combinations are
supported, including variable bitrate WMA streams. Note that WMA does not consume the bitstream as
evenly as MP3, so you need a higher peak transfer capability for clean playback at the same bitrate.
Version 0.6,
2005-01-05
27
VLSI
VS1033a PRELIMINARY
y
Solution
8.2.6
VS1033 A
8. FUNCTIONAL DESCRIPTION
Supported RIFF WAV Formats
The most common RIFF WAV subformats are supported.
Format
0x01
0x02
0x03
0x06
0x07
0x10
0x11
0x15
0x16
0x30
0x31
0x3b
0x3c
0x40
0x41
0x50
0x55
0x64
0x65
Version 0.6,
Name
PCM
ADPCM
IEEE FLOAT
ALAW
MULAW
OKI ADPCM
IMA ADPCM
DIGISTD
DIGIFIX
DOLBY AC2
GSM610
ROCKWELL ADPCM
ROCKWELL DIGITALK
G721 ADPCM
G728 CELP
MPEG
MPEGLAYER3
G726 ADPCM
G722 ADPCM
2005-01-05
Supported
+
+
+
-
Comments
16 and 8 bits, any sample rate ≤ 48kHz
Any sample rate ≤ 48kHz
For supported MP3 modes, see Chapter 8.2.1
28
VLSI
y
Solution
8.2.7
VS1033a PRELIMINARY
VS1033 A
8. FUNCTIONAL DESCRIPTION
Supported MIDI Formats
General MIDI and SP-MIDI format 0 files are played. Format 1 and 2 files must be converted to format
0 by the user. The maximum simultaneous polyphony is 40. Actual polyphony depends on the internal
clock rate (which is user-selectable), the instruments used, whether the reverb effect is enabled, and
the possible global postprocessing effects enabled, such as bass and treble enhancers. The polyphony
restriction algorithm makes use of the SP-MIDI MIP table, if present.
36.86 MHz (3.0× input clock) achieves 16-26 simultaneous sustained notes. The instantaneous amount
of notes can be larger. 36 MHz is a fair compromise between power consumption and quality, but higher
clocks can be used to increase the polyphony.
Reverb effect can be controlled by the user. In addition to reverb automatic and reverb off modes, 14
different decay times can be selected. These roughly correspond to different room sizes. Also, each
midi song decides how much effect each instrument gets. Because the reverb effect uses about 4 MHz of
processing power the automatic control enables reverb only when the internal clock is at least 3.0×.
31 new instruments have been implemented in addition to the 36 that are available in VS1003.
Melodic
piano
vibraphone
organ
guitar
distortion guitar
bass
violin
strings
trumpet
sax
flute
lead
pad
steeldrum
Version 0.6,
2005-01-05
VS1003
Effect
reverse cymbal
guitar fret noise
breath
seashore
bird tweet
telephone
helicopter
applause
gunshot
Percussion
bass drum
snare
closed hihat
open hihat
high tom
low tom
crash cymbal 2
ride cymbal
tambourine
high conga
low conga
maracas
claves
New in VS1033
Melodic
Percussion
slap bass 1
high mid tom
synth bass 1
low mid tom
synth bass 2
high floor tom
church organ
low floor tom
guitar (nylon)
crash cymbal 1
choir aahs
cow bell
pizzicato strings open triangle
square lead
mute triangle
chiff lead
long whistle
fifths lead
short whistle
bass lead
side stick
warm pad
hand clap
polysynth
cabasa
sweep pad
low wood block
wood block
high wood block
castanets
29
VLSI
y
Solution
8.3
VS1033 A
VS1033a PRELIMINARY
8. FUNCTIONAL DESCRIPTION
Data Flow of VS1033
SDI
Bitstream
FIFO
MP3
WAV/ADPCM/
WMA / AAC /
MIDI decode
SM_ADPCM=0
AIADDR = 0
User
Application
AIADDR != 0
SB_AMPLITUDE=0
Bass
enhancer
SB_AMPLITUDE!=0
ST_AMPLITUDE=0
Treble
enhancer
ST_AMPLITUDE!=0
Volume
control
Audio
FIFO
SCI_VOL
2048 stereo
samples
L
S.rate.conv.
R
and DAC
Figure 12: Data Flow of VS1033.
First, depending on the audio data, and provided ADPCM encoding mode is not set, MP3, WMA, AAC,
PCM WAV, IMA ADPCM WAV, or MIDI data is received and decoded from the SDI bus.
After decoding, if SCI AIADDR is non-zero, application code is executed from the address pointed to
by that register. For more details, see Application Notes for VS10XX.
Then data may be sent to the Bass and Treble Enhancer depending on the SCI BASS register.
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 10.14.1) and fed to the
sample rate converter and DACs. The size of the audio FIFO is 2048 stereo (2×16-bit) samples, or 8
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.
8.4 Serial Data Interface (SDI)
The serial data interface is meant for transferring compressed MP3, WMA, or AAC data, WAV PCM and
ADPCM data as well as MIDI data.
If the input of the decoder is invalid or it is not received fast enough, analog outputs are automatically
muted.
Also several different tests may be activated through SDI as described in Chapter 9.
Version 0.6,
2005-01-05
30
VLSI
VS1033a PRELIMINARY
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Solution
8.5
VS1033 A
8. FUNCTIONAL DESCRIPTION
Serial Control Interface (SCI)
The serial control interface is compatible with the SPI bus specification. Data transfers are always 16
bits. VS1033 is controlled by writing and reading the registers of the interface.
The main controls of the control interface are:
•
•
•
•
8.6
control of the operation mode, clock, and builtin effects
access to status information and header data
access to encoded digital data
uploading user programs
SCI Registers
VS1033 sets DREQ low when it detects an SCI operation and restores it when it has processed the
operation. The duration depends on the operation. Do not start a new SCI/SDI operation before DREQ
is high again. If DREQ is low when an SCI operation is performed, it also stays low after SCI operation
processing.
Reg
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
0x8
0x9
0xA
0xB
0xC
0xD
0xE
0xF
Type
rw
rw
rw
rw
rw
rw
rw
rw
r
r
rw
rw
rw
rw
rw
rw
Reset
0x800
0x0C3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
SCI registers, prefix SCI
Time1 Abbrev[bits]
70 CLKI4 MODE
40 CLKI STATUS
2100 CLKI BASS
11000 XTALI5 CLOCKF
40 CLKI DECODE TIME
3200 CLKI AUDATA
80 CLKI WRAM
80 CLKI WRAMADDR
- HDAT0
- HDAT1
3200 CLKI2 AIADDR
2100 CLKI VOL
50 CLKI2 AICTRL0
50 CLKI2 AICTRL1
50 CLKI2 AICTRL2
50 CLKI2 AICTRL3
Description
Mode control
Status of VS1033
Built-in bass/treble enhancer
Clock freq + multiplier
Decode time in seconds
Misc. audio data
RAM write/read
Base address for RAM write/read
Stream header data 0
Stream header data 1
Start address of application
Volume control
Application control register 0
Application control register 1
Application control register 2
Application control register 3
1
This is the worst-case time that DREQ stays low after writing to this register. The user may choose to
skip the DREQ check for those register writes that take less than 100 clock cycles to execute.
2
In addition, the cycles spent in the user application routine must be counted.
3
Firmware changes the value of this register immediately to 0x48, and in less than 100 ms to 0x40.
4
When mode register write specifies a software reset the worst-case time is 16600 XTALI cycles.
5
Writing to this register may force internal clock to run at 1.0 × XTALI for a while. Thus it is not a
good idea to send SCI or SDI bits while this register update is in progress.
Version 0.6,
2005-01-05
31
VLSI
VS1033a PRELIMINARY
y
Solution
8.6.1
VS1033 A
8. FUNCTIONAL DESCRIPTION
SCI MODE (RW)
SCI MODE is used to control the operation of VS1033 and defaults to 0x0800 (SM SDINEW set).
Bit
0
Name
SM DIFF
Function
Differential
1
SM LAYER12
Allow MPEG layers I & II
2
SM RESET
Soft reset
3
SM OUTOFWAV
Jump out of WAV decoding
4
SM PDOWN
Powerdown
5
SM TESTS
Allow SDI tests
6
SM STREAM
Stream mode
7
SM SETTOZERO2
Set to zero
8
SM DACT
DCLK active edge
9
SM SDIORD
SDI bit order
10
SM SDISHARE
Share SPI chip select
11
SM SDINEW
VS1002 native SPI modes
12
SM ADPCM
ADPCM recording active
13
SM ADPCM HP
ADPCM high-pass filter active
14
SM LINE IN
ADPCM recording selector
15
SM CLK RANGE
Input clock range
Value
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Description
normal in-phase audio
left channel inverted
no
yes
no reset
reset
no
yes
power on
powerdown
not allowed
allowed
no
yes
right
wrong
rising
falling
MSb first
MSb last
no
yes
no
yes
no
yes
no
yes
microphone
line in
12..13 MHz
24..26 MHz
When SM DIFF is set, the player inverts the left channel output. For a stereo input this creates virtual
surround, and for a mono input this creates a differential left/right signal.
SM LAYER12 enables MPEG 1.0 and 2.0 layer I and II decoding in addition to layer III. If you enable
Layer I and Layer II decoding, you are liable for any patent issues that may arise. Joint licensing
of MPEG 1.0 / 2.0 Layer III does not cover all patents pertaining to layers I and II.
Software reset is initiated by setting SM RESET to 1. This bit is cleared automatically.
If you want to stop decoding a WAV, WMA, or MIDI file in the middle, set SM OUTOFWAV, and send
data honouring DREQ until SM OUTOFWAV is cleared. SCI HDAT1 will also be cleared. For WMA
and MIDI it is safest to continue sending the stream, send zeroes for WAV.
Bit SM PDOWN sets VS1033 into software powerdown mode. During powerdown, no audio is played
and no SDI operations are performed. For best results, set SCI VOL to 0xFFFF before activating software powerdown. Note that software powerdown is not nearly as power efficient as hardware powerdown
activated with the XRESET pin.
If SM TESTS is set, SDI tests are allowed. For more details on SDI tests, look at Chapter 9.10.
Version 0.6,
2005-01-05
32
VLSI
y
Solution
VS1033 A
VS1033a PRELIMINARY
8. FUNCTIONAL DESCRIPTION
SM STREAM activates VS1033’s stream mode. In this mode, data should be sent with as even intervals
as possible and preferable in blocks of less than 512 bytes, and VS1033 makes every attempt to keep its
input buffer half full by changing its playback speed upto 5%. For best quality sound, the average speed
error should be within 0.5%, the bitrate should not exceed 160 kbit/s and VBR should not be used. For
details, see Application Notes for VS10XX. This mode only works with MP3 and WAV files.
SM DACT defines the active edge of data clock for SDI. When ’0’, data is read at the rising edge, when
’1’, data is read at the falling edge.
When SM SDIORD is clear, bytes on SDI are sent MSb first. By setting SM SDIORD, the user may
reverse the bit order for SDI, i.e. bit 0 is received first and bit 7 last. Bytes are, however, still sent in the
default order. This register bit has no effect on the SCI bus.
Setting SM SDISHARE makes SCI and SDI share the same chip select, as explained in Chapter 7.2, if
also SM SDINEW is set.
Setting SM SDINEW will activate VS1002 native serial modes as described in Chapters 7.2.1 and 7.4.2.
Note, that this bit is set as a default when VS1033 is started up.
By activating SM ADPCM and SM RESET at the same time, the user will activate IMA ADPCM recording mode. More information is available in the Application Notes for VS10XX.
If SM ADPCM HP is set at the same time as SM ADPCM and SM RESET, ADPCM mode will start
with a high-pass filter. This may help intelligibility of speech when there is lots of background noise.
The difference created to the ADPCM encoder frequency response is as shown in Figure 13.
VS1023 AD Converter with and Without HP Filter
5
No High−Pass
High−Pass
Amplitude / dB
0
−5
−10
−15
−20
0
500
1000
1500
2000
2500
Frequency / Hz
3000
3500
4000
Figure 13: ADPCM Frequency Responses with 8 kHz sample rate.
SM LINE IN is used to select the input for ADPCM recording. If ’0’, microphone input pins MICP and
MICN are used; if ’1’, LINEIN is used.
SM CLK RANGE activates a clock divider in the XTAL input. When SM CLK RANGE is set, from
the chip’s point of view e.g. 24 MHz becomes 12 MHz. SM CLK RANGE should be set as soon as
possible after a chip reset.
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Solution
8.6.2
VS1033 A
8. FUNCTIONAL DESCRIPTION
SCI STATUS (RW)
SCI STATUS contains information on the current status of VS1033 and lets the user shutdown the chip
without audio glitches.
Name
SS VER
SS APDOWN2
SS APDOWN1
SS AVOL
Bits
6:4
3
2
1:0
Description
Version
Analog driver powerdown
Analog internal powerdown
Analog volume control
SS VER is 0 for VS1001, 1 for VS1011, 2 for VS1002, 3 for VS1003, and 5 for VS1033.
SS APDOWN2 controls analog driver powerdown. Normally this bit is controlled by the system firmware.
However, if the user wants to powerdown VS1033 with a minimum power-off transient, turn this bit to
1, then wait for at least a few milliseconds before activating reset.
SS APDOWN1 controls internal analog powerdown. This bit is meant to be used by the system firmware
only.
SS AVOL is the analog volume control: 0 = -0 dB, 1 = -6 dB, 3 = -12 dB. This register is meant to be
used automatically by the system firmware only.
8.6.3
SCI BASS (RW)
Name
ST AMPLITUDE
ST FREQLIMIT
SB AMPLITUDE
SB FREQLIMIT
Bits
15:12
11:8
7:4
3:0
Description
Treble Control in 1.5 dB steps (-8..7, 0 = off)
Lower limit frequency in 1000 Hz steps (0..15)
Bass Enhancement in 1 dB steps (0..15, 0 = off)
Lower limit frequency in 10 Hz steps (2..15)
The Bass Enhancer VSBE is a powerful bass boosting DSP algorithm, which tries to take the most out
of the users earphones without causing clipping.
VSBE is activated when SB AMPLITUDE is non-zero. SB AMPLITUDE should be set to the user’s
preferences, and SB FREQLIMIT to roughly 1.5 times the lowest frequency the user’s audio system can
reproduce. For example setting SCI BASS to 0x00f6 will have 15 dB enhancement below 60 Hz.
Note: Because VSBE tries to avoid clipping, it gives the best bass boost with dynamical music material,
or when the playback volume is not set to maximum. It also does not create bass: the source material
must have some bass to begin with.
Treble Control VSTC is activated when ST AMPLITUDE is non-zero. For example setting SCI BASS
to 0x7a00 will have 10.5 dB treble enhancement at and above 10 kHz.
Bass Enhancer uses about 2.1 MIPS and Treble Control 1.2 MIPS at 44100 Hz sample rate. Both can be
on simultaneously.
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Solution
8.6.4
VS1033 A
8. FUNCTIONAL DESCRIPTION
SCI CLOCKF (RW)
The operation of SCI CLOCKF is different in VS1003 and VS1033 than in VS10x1 and VS1002. For
general applications with 12.288 MHz clock use 0x9000 for 3.0 × ..4.0×, or 0xa800 for 3.5 × ..4.0×.
Name
SC MULT
SC ADD
SC FREQ
SCI CLOCKF bits
Bits
Description
15:13 Clock multiplier
12:11 Allowed multiplier addition
10: 0 Clock frequency
SC MULT activates the built-in clock multiplier. This will multiply XTALI to create a higher CLKI.
The values are as follows:
SC MULT
0
1
2
3
4
5
6
7
MASK
0x0000
0x2000
0x4000
0x6000
0x8000
0xa000
0xc000
0xe000
CLKI
XTALI
XTALI×1.5
XTALI×2.0
XTALI×2.5
XTALI×3.0
XTALI×3.5
XTALI×4.0
XTALI×4.5
SC ADD tells, how much the decoder firmware is allowed to add to the multiplier specified by SC MULT
if more cycles are temporarily needed to decode a WMA stream. The values are:
SC ADD
0
1
2
3
MASK
0x0000
0x0800
0x1000
0x1800
Multiplier addition
No modification is allowed
0.5×
1.0×
1.5×
SC FREQ is used to tell if the input clock XTALI is running at something else than 12.288 MHz. XTALI
is set in 4 kHz steps. The formula for calculating the correct value for this register is XT ALI−8000000
4000
(XTALI is in Hz).
Note: The default value 0 is assumed to mean XTALI=12.288 MHz.
Note: because maximum sample rate is
MHz.
XT ALI
256 ,
all sample rates are not available if XTALI < 12.288
Note: Automatic clock change can only happen when decoding WMA files. Automatic clock change is
done one 0.5× at a time. This does not cause a drop to 1.0× clock and you can use the same SCI and
SDI clock throughout the WMA file.
Example: If SCI CLOCKF is 0x9BE8, SC MULT = 4, SC ADD = 3 and SC FREQ = 0x3E8 = 1000.
This means that XTALI = 1000×4000+8000000 = 12 MHz. The clock multiplier is set to 3.0×XTALI =
36 MHz, and the maximum allowed multiplier that the firmware may automatically choose to use is
(3.0 + 1.5)×XTALI = 54 MHz.
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8.6.5
VS1033a PRELIMINARY
VS1033 A
8. FUNCTIONAL DESCRIPTION
SCI DECODE TIME (RW)
When decoding correct data, current decoded time is shown in this register in full seconds.
The user may change the value of this register. In that case the new value should be written twice.
SCI DECODE TIME is reset at every software reset and also when WAV (PCM or IMA ADPCM), AAC,
WMA, or MIDI decoding starts or ends.
8.6.6
SCI AUDATA (RW)
When decoding correct data, the current sample rate and number of channels can be found in bits 15:1
and 0 of SCI AUDATA, respectively. Bits 15:1 contain the sample rate divided by two, and bit 0 is 0 for
mono data and 1 for stereo. Writing to SCI AUDATA will change the sample rate directly.
Example: 44100 Hz stereo data reads as 0xAC45 (44101).
Example: 11025 Hz mono data reads as 0x2B10 (11024).
Example: Writing 0xAC80 sets sample rate to 44160 Hz, stereo mode does not change.
8.6.7
SCI WRAM (RW)
SCI WRAM is used to upload application programs and data to instruction and data RAMs. The start
address must be initialized by writing to SCI WRAMADDR prior to the first write/read of SCI WRAM.
As 16 bits of data can be transferred with one SCI WRAM write/read, and the instruction word is 32 bits
long, two consecutive writes/reads are needed for each instruction word. The byte order is big-endian (i.e.
most significant words first). After each full-word write/read, the internal pointer is autoincremented.
8.6.8
SCI WRAMADDR (W)
SCI WRAMADDR is used to set the program address for following SCI WRAM writes/reads. Address
offset of 0 is used for X, 0x4000 for Y, and 0x8000 for instruction memory. Peripheral registers can also
be accessed.
SM WRAMADDR
Start. . . End
0x1800. . . 0x187F
0x5800. . . 0x587F
0x8030. . . 0x84FF
0xC000. . . 0xFFFF
Dest. addr.
Start. . . End
0x1800. . . 0x187F
0x1800. . . 0x187F
0x0030. . . 0x04FF
0xC000. . . 0xFFFF
Bits/
Word
16
16
32
16
Description
X data RAM
Y data RAM
Instruction RAM
I/O
Only user areas in X, Y, and instruction memory are listed above. Other areas can be accessed, but should
not be written to unless otherwise specified.
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8.6.9
VS1033a PRELIMINARY
VS1033 A
8. FUNCTIONAL DESCRIPTION
SCI HDAT0 and SCI HDAT1 (R)
For WAV files, SCI HDAT1 contains 0x7665 (“ve”). SCI HDAT0 contains the data rate in double word
increments for all supported RIFF WAVE formats: mono and stereo 8-bit or 16-bit PCM, mono and
stereo IMA ADPCM. To get the byte rate of the file, multiply the value by 4. To get the bit rate of the
file, multiply the value by 32. Note: usage of SCI HDAT0 with WAV files has changed from VS1003.
For AAC ADTS streams, SCI HDAT1 contains 0x4154 (“AT”). For AAC ADIF files, SCI HDAT1 contains 0x4144 (“AD”). For AAC .mp4 / .m4a files, SCI HDAT1 contains 0x4D34 (“M4”). SCI HDAT0
contains the average data rate in bytes per second. To get the bit rate of the file, multiply the value by 8.
For WMA files, SCI HDAT1 contains 0x574D (“WM”) and SCI HDAT0 contains the data rate measured
in bytes per second. To get the bit rate of the file, multiply the value by 8.
for MIDI files, SCI HDAT1 contains 0x4D54 (“MT”) and SCI HDAT0 contains the average data rate in
bytes per second. To get the bit rate of the file, multiply the value by 8. Note: usage of SCI HDAT0 with
MIDI has changed from VS1003.
For MP3 files, SCI HDAT1 is between 0xFFE0 and 0xFFFF. SCI HDAT1 / 0 contain the following:
Version 0.6,
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Bit
HDAT1[15:5]
HDAT1[4:3]
Function
syncword
ID
HDAT1[2:1]
layer
HDAT1[0]
protect bit
HDAT0[15:12]
HDAT0[11:10]
bitrate
sample rate
HDAT0[9]
pad bit
HDAT0[8]
HDAT0[7:6]
private bit
mode
HDAT0[5:4]
HDAT0[3]
extension
copyright
HDAT0[2]
original
HDAT0[1:0]
emphasis
Value
2047
3
2
1
0
3
2
1
0
1
0
3
2
1
0
1
0
3
2
1
0
1
0
1
0
3
2
1
0
Explanation
stream valid
ISO 11172-3 MPG 1.0
ISO 13818-3 MPG 2.0 (1/2-rate)
MPG 2.5 (1/4-rate)
MPG 2.5 (1/4-rate)
I
II
III
reserved
No CRC
CRC protected
see bitrate table
reserved
32/16/ 8 kHz
48/24/12 kHz
44/22/11 kHz
additional slot
normal frame
not defined
mono
dual channel
joint stereo
stereo
see ISO 11172-3
copyrighted
free
original
copy
CCITT J.17
reserved
50/15 microsec
none
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Solution
VS1033 A
VS1033a PRELIMINARY
8. FUNCTIONAL DESCRIPTION
When read, SCI HDAT0 and SCI HDAT1 contain header information that is extracted from MP3 stream
currently being decoded. After reset both registers are cleared, indicating no data has been found yet.
The “sample rate” field in SCI HDAT0 is interpreted according to the following table:
“sample rate”
3
2
1
0
ID=3
32000
48000
44100
ID=2
16000
24000
22050
ID=0,1
8000
12000
11025
The “bitrate” field in HDAT0 is read according to the following table. Notice that for variable bitrate
stream the value changes constantly.
“bitrate”
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
8.6.10
Layer I
ID=3 ID=0,1,2
kbit/s
forbidden forbidden
448
256
416
224
384
192
352
176
320
160
288
144
256
128
224
112
192
96
160
80
128
64
96
56
64
48
32
32
-
Layer II
ID=3 ID=0,1,2
kbit/s
forbidden forbidden
384
160
320
144
256
128
224
112
192
96
160
80
128
64
112
56
96
48
80
40
64
32
56
24
48
16
32
8
-
Layer III
ID=3 ID=0,1,2
kbit/s
forbidden forbidden
320
160
256
144
224
128
192
112
160
96
128
80
112
64
96
56
80
48
64
40
56
32
48
24
40
16
32
8
-
SCI AIADDR (RW)
SCI AIADDR indicates the start address of the application code written earlier with SCI WRAMADDR
and SCI WRAM registers. If no application code is used, this register should not be initialized, or it
should be initialized to zero. For more details, see Application Notes for VS10XX.
8.6.11
SCI VOL (RW)
SCI VOL is a volume control for the player hardware. For each channel, a value in the range of 0..254
may be defined to set its attenuation from the maximum volume level (in 0.5 dB steps). The left channel
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VS1033a PRELIMINARY
VS1033 A
8. FUNCTIONAL DESCRIPTION
value is then multiplied by 256 and the values are added. Thus, maximum volume is 0 and total silence
is 0xFEFE.
Example: for a volume of -2.0 dB for the left channel and -3.5 dB for the right channel: (4*256) + 7
= 0x407. Note, that at startup volume is set to full volume. Resetting the software does not reset the
volume setting.
Note: Setting SCI VOL to 0xFFFF will activate analog powerdown mode.
8.6.12
SCI AICTRL[x] (RW)
SCI AICTRL[x] registers ( x=[0 .. 3] ) can be used to access the user’s application program.
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9
9.1
VS1033a PRELIMINARY
VS1033 A
9. OPERATION
Operation
Clocking
VS1033 operates on a single, nominally 12.288 MHz fundamental frequency master clock. This clock
can be generated by external circuitry (connected to pin XTALI) or by the internal clock chrystal interface
(pins XTALI and XTALO).
VS1033 can also use 24..26 MHz clocks when SM CLK RANGE is set to 1. From the chip’s point of
view the input clock is then 12..23 MHz.
9.2 Hardware Reset
When the XRESET -signal is driven low, VS1033 is reset and all the control registers and internal states
are set to the initial values. XRESET-signal is asynchronous to any external clock. The reset mode
doubles as a full-powerdown mode, where both digital and analog parts of VS1033 are in minimum
power consumption stage, and where clocks are stopped. Also XTALO is grounded.
After a hardware reset (or at power-up) DREQ will stay down for at least 16600 clock cycles, which
means an approximate 1.35 ms delay if VS1033 is run at 12.288 MHz. After this the user should set
such basic software registers as SCI MODE, SCI BASS, SCI CLOCKF, and SCI VOL before starting
decoding. See section 8.6 for details.
If the input clock is 24..26 MHz, SM CLK RANGE should be set as soon as possible after a chip reset.
Internal clock can be multiplied with a PLL. Supported multipliers through the SCI CLOCKF register
are 1.0 × . . . 4.5× the input clock. Reset value for Internal Clock Multiplier is 1.0×. If typical values
are wanted, the Internal Clock Multiplier needs to be set to 3.0× after reset. Wait until DREQ rises, then
write value 0x9800 to SCI CLOCKF (register 3). See section 8.6.4 for details.
9.3
Software Reset
In some cases the decoder software has to be reset. This is done by activating bit 2 in SCI MODE register
(Chapter 8.6.1). Then wait for at least 2 µs, then look at DREQ. DREQ will stay down for at least 16600
clock cycles, which means an approximate 1.35 ms delay if VS1033 is run at 12.288 MHz. After DREQ
is up, you may continue playback as usual.
If you want to make sure VS1033 doesn’t cut the ending of low-bitrate data streams and you want to do
a software reset, it is recommended to feed 2048 zeros (honoring DREQ) to the SDI bus after the file and
before the reset. This is especially important for MIDI files.
If you want to interrupt the playing of a WAV, AAC, WMA, or MIDI file in the middle, set SM OUTOFWAV
in the mode register, and wait until SCI HDAT1 is cleared (with a two-second timeout) before continuing with a software reset. MP3 can be interrupted without SM OUTOFWAV by just sending zero bytes,
because it is a stream format.
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9.4
VS1033a PRELIMINARY
VS1033 A
9. OPERATION
ADPCM Recording
This chapter explains how to create RIFF/WAV file with IMA ADPCM format. This is a widely supported ADPCM format and many PC audio playback programs can play it. IMA ADPCM recording
gives roughly a compression ratio of 4:1 compared to linear, 16-bit audio. This makes it possible to
record 8 kHz audio at 32.44 kbit/s.
9.4.1
Activating ADPCM mode
IMA ADPCM recording mode is activated by setting bits SM RESET and SM ADPCM in SCI MODE.
Optionally a high-pass-filter can be enabled for 8 kHz sample rate by also setting SM ADPCM HP at the
same time. Line input is used instead of mic if SM LINE IN is set. Before activating ADPCM recording,
user must write a clock divider value to SCI AICTRL0 and gain to SCI AICTRL1.
The differences of using SM ADPCM HP are presented in figure 13 (page 33). As a general rule, audio
will be fuller and closer to original if SM ADPCM HP is not used. However, speech may be more
intelligible with the high-pass filter active. Use the filter only with 8 kHz sample rate.
Before activating ADPCM recording, user should write a clock divider value to SCI AICTRL0. The
Fc
sampling frequency is calculated from the following formula: fs = 256×d
, where Fc is the internal clock
(CLKI) and d is the divider value in SCI AICTRL0. The lowest valid value for d is 4. If SCI AICTRL0
contains 0, the default divider value 12 is used.
Examples:
Fc = 2.0 × 12.288 MHz, d = 12. Now fs = 2.0×12288000
= 8000 Hz.
256×12
Fc = 2.5 × 14.745 MHz, d = 18. Now fs = 2.5×14745000
= 8000 Hz.
256×18
2.5×13000000
Fc = 2.5 × 13 MHz, d = 16. Now fs = 256×16 = 7935 Hz.
Also, before activating ADPCM mode, the user has to set linear recording gain control to register
SCI AICTRL1. 1024 is equal to digital gain 1, 512 is equal to digital gain 0.5 and so on. If the user
wants to use automatic gain control (AGC), SCI AICTRL1 should be set to 0. Typical speech applications usually are better off using AGC, as this takes care of relatively uniform speech loudness in
recordings.
9.4.2
Reading IMA ADPCM Data
After IMA ADPCM recording has been activated, registers SCI HDAT0 and SCI HDAT1 have new
functions.
The IMA ADPCM sample buffer is 1024 16-bit words. The fill status of the buffer can be read from
SCI HDAT1. If SCI HDAT1 is greater than 0, you can read as many 16-bit words from SCI HDAT0. If
the data is not read fast enough, the buffer overflows and returns to empty state.
Note: if SCI HDAT1 ≥ 896, it may be better to wait for the buffer to overflow and clear before reading
samples. That way you may avoid buffer aliasing.
Each IMA ADPCM block is 128 words, i.e. 256 bytes. If you wish to interrupt reading data and possibly
continue later, please stop at a 128-word boundary. This way whole blocks are skipped and the encoded
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VS1033 A
VS1033a PRELIMINARY
9. OPERATION
stream stays valid.
9.4.3
Adding a RIFF Header
To make your IMA ADPCM file a RIFF / WAV file, you have to add a header before the actual data.
Note that 2- and 4-byte values are little-endian (lowest byte first) in this format:
File Offset
0
4
8
12
16
20
22
24
28
32
34
36
38
40
44
48
52
56
60
62
64
316
Field Name
ChunkID
ChunkSize
Format
SubChunk1ID
SubChunk1Size
AudioFormat
NumOfChannels
SampleRate
ByteRate
BlockAlign
BitsPerSample
ByteExtraData
ExtraData
SubChunk2ID
SubChunk2Size
NumOfSamples
SubChunk3ID
SubChunk3Size
Block1Sample
Block1Step
Block1Data
...
Size
4
4
4
4
4
2
2
4
4
2
2
2
2
4
4
4
4
4
2
2
252
Bytes
"RIFF"
F0 F1 F2 F3
"WAVE"
"fmt "
0x14 0x0 0x0 0x0
0x11 0x0
0x1 0x0
R0 R1 R2 R3
B0 B1 B2 B3
0x0 0x1
0x4 0x0
0x2 0x0
0xf9 0x1
"fact"
0x4 0x0 0x0 0x0
S0 S1 S2 S3
"data"
D0 D1 D2 D3
Description
File size - 8
20
0x11 for IMA ADPCM
Mono sound
0x1f40 for 8 kHz
0xfd7 for 8 kHz
0x100
4-bit ADPCM
2
Samples per block (505)
4
File Size - 60
16-bit linear first sample
ADPCM state
504 4-bit ADPCM samples
More ADPCM data blocks
If we have n audio blocks, the values in the table are as follows:
F = n × 256 + 52
R = Fs (see Chapter 9.4.1 to see how to calculate Fs )
×256
B = Fs505
S = n × 505. D = n × 256
If you know beforehand how much you are going to record, you may fill in the complete header before
any actual data. However, if you don’t know how much you are going to record, you have to fill in the
header size datas F , S and D after finishing recording.
16-bit ADPCM values that are read from SCI HDAT0 are to be interpreted as big-endian values. In other
words, the high 8 bits of SCI HDAT0 should be written as the first byte to a file, then the low 8 bits. Note
that this is contrary to the default operation of some 16-bit microcontrollers, and you may have to take
extra care to do this right.
A way to see if you have written the file in the right way is to check bytes 2 and 3 (the first byte counts
as byte 0) of each 256-byte block. Byte 3 should always be zero.
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9.4.4
VS1033 A
VS1033a PRELIMINARY
9. OPERATION
Playing ADPCM Data
In order to play back your IMA ADPCM recordings, you have to have a file with a header as described
in Chapter 9.4.3. If this is the case, all you need to do is to provide the ADPCM file through SDI as you
would with any audio file.
9.4.5
Sample Rate Considerations
VS10xx chips that support IMA ADPCM playback are capable of playing back ADPCM files with
any sample rate. However, some other programs may expect IMA ADPCM files to have some exact
sample rates, like 8000 or 11025 Hz. Also, some programs or systems do not support sample rates below
8000 Hz.
However, if you don’t have an appropriate clock, you may not be able to get an exact 8 kHz sample rate.
If you have a 12 MHz clock, the closest sample rate you can get with 2.0 × 12 MHz and d = 12 is
fs = 7812.5Hz. Because the frequency error is only 2.4%, it may be best to set fs = 8000Hz to the
header if the same file is also to be played back with an PC. This causes the sample to be played back a
little faster (one minute is played in 59 seconds).
Note, however, that unless absolutely necessary, sample rates should not be tweaked in the way described
here.
If you want better quality with the expense of increased data rate, you can use higher sample rates, for
example 16 kHz.
9.4.6
Example Code
The following code initializes IMA ADPCM encoding on VS1003b/VS1023 and shows how to read the
data.
const unsigned char
0x52, 0x49, 0x46,
0x57, 0x41, 0x56,
0x14, 0x00, 0x00,
0x40, 0x1f, 0x00,
0x00, 0x01, 0x04,
0x66, 0x61, 0x63,
0x5c, 0x1f, 0x00,
0xe8, 0x0f, 0x00,
};
header[] = {
0x46, 0x1c, 0x10,
0x45, 0x66, 0x6d,
0x00, 0x11, 0x00,
0x00, 0x75, 0x12,
0x00, 0x02, 0x00,
0x74, 0x04, 0x00,
0x00, 0x64, 0x61,
0x00
0x00,
0x74,
0x01,
0x00,
0xf9,
0x00,
0x74,
0x00,
0x20, /*|RIFF....WAVEfmt |*/
0x00,
0x00, /*|........@......|*/
0x01,
0x00, /*|.......fact....|*/
0x61,
unsigned char db[512]; /* data buffer for saving to disk */
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Solution
void RecordAdpcm1003(void) {
u_int16 w = 0, idx = 0;
...
VS1033 A
9. OPERATION
/* VS1003b/VS1023 */
/* Check and locate free space on disk */
SetMp3Vol(0x1414);
WriteMp3SpiReg(SCI_BASS,
/* Recording monitor volume */
0); /* Bass/treble disabled */
WriteMp3SpiReg(SCI_CLOCKF, 0x4430); /* 2.0x 12.288MHz */
Wait(100);
WriteMp3SpiReg(SCI_AICTRL0, 12);
/* Div -> 12=8kHz 8=12kHz 6=16kHz */
Wait(100);
WriteMp3SpiReg(SCI_AICTRL1, 0);
/* Auto gain */
Wait(100);
if (line_in) {
WriteMp3SpiReg(SCI_MODE, 0x5804); /* Normal SW reset + other bits */
} else {
WriteMp3SpiReg(SCI_MODE, 0x1804); /* Normal SW reset + other bits */
}
for (idx=0; idx < sizeof(header); idx++) { /* Save header first */
db[idx] = header[idx];
}
/* Fix rate if needed */
/*db[24] = rate;*/
/*db[25] = rate>>8;*/
/* Record loop */
while (recording_on) {
do {
w = ReadMp3SpiReg(SCI_HDAT1);
} while (w < 256 || w > 896);
while (idx < 512) {
w = ReadMp3SpiReg(SCI_HDAT0);
/* Resynchronize if IMA sync is lost */
while ((idx & 255) == sizeof(header)+2 && (w & 0xFF)) {
do {
w = ReadMp3SpiReg(SCI_HDAT1);
} while (w < 256);
w = ReadMp3SpiReg(SCI_HDAT0);
}
db[idx++] = w>>8;
db[idx++] = w&0xFF;
}
idx = 0;
write_block(datasector++, db); /* Write output block to disk */
}
...
/* Fix WAV header information */
...
/* Then update FAT information */
ResetMP3();
/* Normal reset, restore default settings */
SetMp3Vol(vol);
}
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9.5
VS1033a PRELIMINARY
VS1033 A
9. OPERATION
SPI Boot
If GPIO0 is set with a pull-up resistor to 1 at boot time, VS1033 tries to boot from external SPI memory.
SPI boot redefines the following pins:
Normal Mode
GPIO0
GPIO1
DREQ
GPIO2
SPI Boot Mode
xCS
CLK
MOSI
MISO
The memory has to be an SPI Bus Serial EEPROM with 16-bit addresses (i.e. at least 1 KiB). The serial
speed used by VS1033 is 245 kHz with the nominal 12.288 MHz clock. The first three bytes in the
memory have to be 0x50, 0x26, 0x48. The exact record format is explained in the Application Notes for
VS10XX.
9.6
Play/Decode
This is the normal operation mode of VS1033. SDI data is decoded. Decoded samples are converted to
analog domain by the internal DAC. If no decodable data is found, SCI HDAT0 and SCI HDAT1 are set
to 0 and analog outputs are muted.
When there is no input for decoding, VS1033 goes into idle mode (lower power consumption than during
decoding) and actively monitors the serial data input for valid data.
All different formats can be played back-to-back without software reset in-between. Send at least 2052
zeros after each stream. However, using software reset between streams may still be a good idea, as it
guards against broken files. In this case you shouldt wait for the completion of the decoding (SCI HDAT1
and SCI HDAT0 become zero) before issuing software reset.
9.7
Feeding PCM data
VS1033 can be used as a PCM decoder by sending a WAV file header. If the length sent in the WAV
header is 0 or 0xFFFFFFF, VS1033 will stay in PCM mode indefinitely (or until SM OUTOFWAV has
been set). 8-bit linear and 16-bit linear audio is supported in mono or stereo.
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9.8
VS1033 A
9. OPERATION
Extra Parameters
The following structure is in X memory at address 0x1940 and can be used to change some extra parameters or get various information. The chip ID is also easily available.
#define PARAMETRIC_VERSION 0x0001
struct parametric {
u_int32 chipID;
/*1940/41 Initialized at reset for your convenience */
u_int16 version;
/*1942 - structure version */
u_int16 midiConfig; /*1943 */
u_int16 config1;
/*1944 */
u_int16 config2;
/*1945 configs are not cleared between files */
u_int32 jumpPoints[16]; /*1946..65 file byte offsets */
u_int16 latestJump; /*1966 index to lastly updated jumpPoint */
s_int16 seek1;
/*1967 file data inserted/removed bytes -32768..32767*/
s_int16 seek2;
/*1968 file data inserted/removed kB -32768..32767*/
s_int16 resync;
/*1969 > 0 for automatic m4a, ADIF, WMA resyncs */
union {
struct {
u_int32 curPacketSize;
u_int32 packetSize;
} wma;
struct {
u_int16 sceFoundMask; /* SCE’s found since last clear */
u_int16 cpeFoundMask; /* CPE’s found since last clear */
u_int16 lfeFoundMask; /* LFE’s found since last clear */
u_int16 playSelect;
/* 0 = first any, initialized at aac init */
s_int16 dynCompress; /* -8192=1.0, initialized at aac init */
s_int16 dynBoost;
/* 8192=1.0, initialized at aac init */
} aac;
struct {
u_int32 bytesLeft;
} midi;
} i;
};
Notice that reading two-word variables through the SCI WRAMADDR and SCI WRAM interface is
not protected in any way. The variable can be updated between the read of the low and high parts. The
problem arises when both the low and high parts change values. To determine if the value is correct, you
should read the value twice and compare the results.
The following example shows what happens when bytesLeft is decreased from 0x10000 to 0xffff and
the update happens between low and high part reads or after high part read.
Address
0x196a
0x196b
0x196a
0x196b
Read Invalid
Value
0x0000 change after this
0x0000
0xffff
0x0000
Address
0x196a
0x196b
0x196a
0x196b
Read Valid
Value
0x0000
0x0001 change after this
0xffff
0x0000
No Update
Address Value
0x196a
0x0000
0x196b
0x0001
0x196a
0x0000
0x196b
0x0001
You can see that in the invalid read the low part wraps from 0x0000 to 0xffff while the high part stays the
same. In this case the second read gives a valid answer, otherwise always use the value of the first read.
The second read is needed when it is possible that the low part wraps around, changing the high part, i.e.
when the low part is small. bytesLeft is only decreased by one at a time, so a reread is needed only
if the low part is 0.
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9.8.1
VS1033 A
9. OPERATION
Common Parameters
Parameter
chipID
version
jumpPoints[16]
latestJump
seek1
seek2
resync
Address
0x1940/41
0x1942
0x1946-65
0x1966
0x1967
0x1968
0x1969
Usage
Fuse-programmed unique ID (copy)
Structure version – 0x0001
Packet offsets for WMA and AAC
Index to latest jumpPoint
Seek amount in bytes
Seek amount in kilobytes
Automatic resync selector
The fuse-programmed ID is read at startup and copied into the chipID field. The version field can
be used to determine the layout of the rest of the structure. The version number is changed when the
structure is changed.
jumpPoints contain 32-bit file offsets. Each valid (non-zero) entry indicates a start of a packet for
WMA or start of a raw data block for AAC (ADIF, .mp4 / .m4a). latestJump contains the index of
the entry that was updated last. If you only read entry pointed to by latestJump you do not need to
read the entry twice to ensure validity. Jump point information can be used to implement perfect fast
forward and rewind for WMA and AAC (ADIF, .mp4 / .m4a).
seek1 and seek2 fields are used when music data is skipped or inserted. Negative values mean that
data has been added (for example in rewind operation), positive values mean that data has been skipped.
You can use either seek1, which gives the seek amount in bytes, or seek2 which gives the seek amount
in kilobytes, or you can use both. The field value is zeroed when the firmware has detected the seek.
resync field is used to force a resynchronization to the stream for WMA and AAC (ADIF, .mp4 / .m4a).
This field can be used to implement almost perfect fast forward and rewind for WMA and AAC (ADIF,
.mp4 / .m4a). The user should set this field before performing data seeks if they are not in packet or data
block boundaries. The field value tells how many tries are allowed before giving up. The value 32767
gives infinite tries, in which case the user must use SM OUTOFWAV or software reset to end decoding.
In every case remember to use seek1 and/or seek2 fields to indicate the skipped/inserted data.
Note: WMA, ADIF, and .mp4 / .m4a files begin with a metadata section, which must be fully processed
before any fast forward or rewind operation. When the first jumpPoint appears it is safe to perform seeks.
You can also detect the start of decoding from SCI DECODE TIME.
9.8.2
WMA
Parameter
curPacketSize
packetSize
Address
0x196a/6b
0x196c/6d
Usage
The size of the packet being processed
The packet size in ASF header
The ASF header packet size is available in packetSize. With this information and a packet start offset
from jumpPoints you can parse the packet headers and skip packets in ASF files.
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9.8.3
VS1033 A
9. OPERATION
AAC
Parameter
sceFoundMask
cpeFoundMask
lfeFoundMask
playSelect
dynCompress
dynBoost
Address
0x196a
0x196b
0x196c
0x196d
0x196e
0x196f
Usage
Single channel elements found
Channel pair elements found
Low frequency elements found
Play element selection
Compress coefficient for DRC, -8192=1.0
Boost coefficient for DRC, 8192=1.0
playSelect determines which element to decode if a stream has multiple elements. The value is
set to 0 each time AAC decoding starts, which causes the first element that appears in the stream to be
selected for decoding. Other values are: 0x01 - select first single channel element (SCE), 0x02 - select
first channel pair element (CPE), 0x03 - select first low frequency element (LFE), S ∗ 16 + 5 - select
SCE number S, P ∗ 16 + 6 - select CPE number P, L ∗ 16 + 7 - select LFE number L. When automatic
selection has been performed, playSelect reflects the selected element.
sceFoundMask, cpeFoundMask, and lfeFoundMask indicate which elements have been found
in an AAC stream since the variables have last been cleared. The values can be used to present an element
selection menu with only the available elements.
dynCompress and dynBoost change the behavior of the dynamic range control (DRC) that is present
in some AAC streams. These are also initialized when AAC decoding starts.
SCI HDAT0 contains the average bitrate in bytes per second, is updated once per second and it can be
used to calculate an estimate of the remaining playtime.
9.8.4
Midi
Parameter
midiConfig
bytesLeft
Address
0x1943
bits [3:0]
bits [6:4]
bits [15:7]
0x196a/6b
Usage
Miscellaneous configuration
Reverb: 0 = auto (ON if clock >= 3.0×)
1 = off, 2 - 15 = room size
Play speed: 0 = 1×, 1 = 2×, 2 = 4×, 3 = 8× .. 7 = 128×
reserved
The number of bytes left in this track
midiConfig controls the reverb effect and play speed.
SCI HDAT0 contains the average bitrate in bytes per second, is updated once per second and it can be
used together with bytesLeft to calculate an estimate of the remaining playtime.
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9.9
VS1033 A
9. OPERATION
Fast Forward / Rewind
9.9.1
MP3
MPEG1.0 and MPEG2.0 layer 3 defines a stream format suitable for random-access. When you want to
skip forward or backwards in the file, first send 2048 zeros, then continue sending the file from the new
location.
By sending zeros you make certain a partial frame does not cause loud artefacts in the sound. The normal
file type checking then finds a new MP3 header and continues decoding.
9.9.2
AAC - ADTS
MPEG2.0 Advanced Audio Coded (AAC) defines a stream format suitable for random-access (ADTS).
When you want to skip forward or backwards in the file, first send 2048 zeros, then continue sending the
file from the new location.
By sending zeros you make certain a partial frame does not cause loud artefacts in the sound. The normal
file type checking then finds a new ADTS header and continues decoding.
9.9.3
AAC - ADIF, MP4
MPEG4.0 Advanced Audio Codec (AAC) specifies a multimedia file format (.mp4 / .m4a) but does not
specify a stream format and MPEG2.0 AAC specifies a file format (ADIF) in addition to the streamable
ADTS format. ADIF and .mp4 / .m4a are not suitable for random-access and it is recommended that
they are converted to ADTS format for playback.
However, it is also possible to implement fast forward and rewind for ADIF and .mp4 / .m4a files. The
easiest way is to use the resync field (see section 9.8.1):
• Write 8192 to resync
– Write 0x1969 to SCI WRAMADDR, Write 0x2000 to SCI WRAM
• Send 2048 zeroes
• Make a seek X in the file (X > 0 for forward seek)
• Indicate the low part of the seek amount by writing to seek1
– Write 0x1967 to SCI WRAMADDR, Write (X − 2048)&1023 to SCI WRAM
• Indicate the high part of the seek amount by writing to seek2
– Write 0x1968 to SCI WRAMADDR, Write (X − 2048)/1024 to SCI WRAM
• Continue sending the file from the new location
Perfect fast forward and rewind can be implemented by using the jumpPoints table and making seeks
only on packet or data block boundaries.
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9.9.4
VS1033 A
9. OPERATION
WMA
Windows Media Audio (WMA) is enclosed as data packets into Advanced Systems Format (ASF) files.
This file format is not suitable for random-access.
However, it is also possible to implement fast forward and rewind for WMA files. The easiest way is to
use the resync field (see Section 9.9.3), perfect fast forward and rewind can be implemented by using
the jumpPoints table and making seeks only on packet or data block boundaries.
9.9.5
Midi
Midi is not at all suitable for random-access. You can implement fast forward using the playSpeed
bits of the midiConfig field to select 1-128× play speed. SCI DECODE TIME also speeds up.
If necessary, rewind can be implemented by restarting the decoding of a MIDI file and fast forwarding
to the appropriate place. SCI DECODE TIME can be used to decide when the right place has been
reached. This is best suited for soundless rewind.
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9.10
VS1033 A
VS1033a PRELIMINARY
9. OPERATION
SDI Tests
There are several test modes in VS1033, which allow the user to perform memory tests, SCI bus tests,
and several different sine wave tests.
All tests are started in a similar way: VS1033 is hardware reset, SM TESTS is set, and then a test
command is sent to the SDI bus. Each test is started by sending a 4-byte special command sequence,
followed by 4 zeros. The sequences are described below.
9.10.1
Sine Test
Sine test is initialized with the 8-byte sequence 0x53 0xEF 0x6E n 0 0 0 0, where n defines the sine test
to use. n is defined as follows:
Name
F s Idx
S
Bits
7:5
4:0
n bits
Description
Sample rate index
Sine skip speed
F s Idx
0
1
2
3
4
5
6
7
Fs
44100 Hz
48000 Hz
32000 Hz
22050 Hz
24000 Hz
16000 Hz
11025 Hz
12000 Hz
The frequency of the sine to be output can now be calculated from F = F s ×
S
128 .
Example: Sine test is activated with value 126, which is 0b01111110. Breaking n to its components,
F s Idx = 0b011 = 3 and thus F s = 22050Hz. S = 0b11110 = 30, and thus the final sine frequency
30
F = 22050Hz × 128
≈ 5168Hz.
To exit the sine test, send the sequence 0x45 0x78 0x69 0x74 0 0 0 0.
Note: Sine test signals go through the digital volume control, so it is possible to test channels separately.
9.10.2
Pin Test
Pin test is activated with the 8-byte sequence 0x50 0xED 0x6E 0x54 0 0 0 0. This test is meant for chip
production testing only.
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9.10.3
VS1033a PRELIMINARY
VS1033 A
9. OPERATION
Memory Test
Memory test mode is initialized with the 8-byte sequence 0x4D 0xEA 0x6D 0x54 0 0 0 0. After this
sequence, wait for 500000 clock cycles. The result can be read from the SCI register SCI HDAT0, and
’one’ bits are interpreted as follows:
Bit(s)
15
14:7
6
5
4
3
2
1
0
Mask
0x8000
0x0040
0x0020
0x0010
0x0008
0x0004
0x0002
0x0001
0x807f
Meaning
Test finished
Unused
Mux test succeeded
Good I RAM
Good Y RAM
Good X RAM
Good I ROM
Good Y ROM
Good X ROM
All ok
Memory tests overwrite the current contents of the RAM memories.
9.10.4
SCI Test
Sci test is initialized with the 8-byte sequence 0x53 0x70 0xEE n 0 0 0 0, where n − 48 is the register
number to test. The content of the given register is read and copied to SCI HDAT0. If the register to be
tested is HDAT0, the result is copied to SCI HDAT1.
Example: if n is 48, contents of SCI register 0 (SCI MODE) is copied to SCI HDAT0.
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10
10.1
VS1033 A
10. VS1033 REGISTERS
VS1033 Registers
Who Needs to Read This Chapter
User software is required when a user wishes to add some own functionality like DSP effects to VS1033.
However, most users of VS1033 don’t need to worry about writing their own code, or about this chapter,
including those who only download software plug-ins from VLSI Solution’s Web site.
10.2
The Processor Core
VS DSP is a 16/32-bit DSP processor core that also had extensive all-purpose processor features. VLSI
Solution’s free VSKIT Software Package contains all the tools and documentation needed to write, simulate and debug Assembly Language or Extended ANSI C programs for the VS DSP processor core.
VLSI Solution also offers a full Integrated Development Environment VSIDE for full debug capabilities.
10.3 VS1033 Memory Map
VS1033’s Memory Map is shown in Figure 14.
10.4 SCI Registers
SCI registers described in Chapter 8.6 can be found here between 0xC000..0xC00F. In addition to these
registers, there is one in address 0xC010, called SCI CHANGE.
Reg
0xC010
Type
r
Reset
0
SCI CHANGE bits
Bits Description
4 1 if last access was a write cycle
3:0 SCI address of last access
Name
SCI CH WRITE
SCI CH ADDR
10.5
Serial Data Registers
Reg
0xC011
0xC012
Version 0.6,
SCI registers, prefix SCI
Abbrev[bits]
Description
CHANGE[5:0]
Last SCI access address
Type
r
w
2005-01-05
Reset
0
0
SDI registers, prefix SER
Abbrev[bits]
Description
DATA
Last received 2 bytes, big-endian
DREQ[0]
DREQ pin control
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VS1033 A
Instruction (32−bit)
0000
0030
0500
X (16−bit)
10. VS1033 REGISTERS
Y (16−bit)
0000
0030
System Vectors
User
Instruction
RAM
1800
1880
1940
0500
X DATA
RAM
Y DATA
RAM
User
Stack
User
Stack
1800
1880
1940
2000
2000
2800
2800
4000
4000
Instruction
ROM
X DATA
ROM
8000
C000
C100
Y DATA
ROM
8000
I/O
FFFF
C000
C100
FFFF
Figure 14: User’s Memory Map.
10.6 DAC Registers
Reg
0xC013
0xC014
0xC015
0xC016
Type
rw
rw
rw
rw
Reset
0
0
0
0
DAC registers, prefix DAC
Abbrev[bits]
Description
FCTLL
DAC frequency control, 16 LSbs
FCTLH
DAC frequency control 4MSbs, PLL control
LEFT
DAC left channel PCM value
RIGHT
DAC right channel PCM value
Every fourth clock cycle, an internal 26-bit counter is added to by (DAC FCTLH & 15) × 65536 +
DAC FCTLL. Whenever this counter overflows, values from DAC LEFT and DAC RIGHT are read and
a DAC interrupt is generated.
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10.7
VS1033 A
10. VS1033 REGISTERS
GPIO Registers
Reg
0xC017
0xC018
0xC019
Type
rw
r
rw
Reset
0
0
0
GPIO registers, prefix GPIO
Abbrev[bits]
Description
DDR[7:0]
Direction
IDATA[7:0]
Values read from the pins
ODATA[7:0]
Values set to the pins
GPIO DIR is used to set the direction of the GPIO pins. 1 means output. GPIO ODATA remembers its
values even if a GPIO DIR bit is set to input.
GPIO registers don’t generate interrupts.
Note that in VS1033 the VSDSP registers can be read and written through the SCI WRAMADDR and
SCI WRAM registers. You can thus use the GPIO pins quite conveniently.
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10.8
VS1033 A
10. VS1033 REGISTERS
Interrupt Registers
Reg
0xC01A
0xC01B
0xC01C
0xC01D
Type
rw
w
w
rw
Reset
0
0
0
0
Interrupt registers, prefix INT
Abbrev[bits]
Description
ENABLE[7:0]
Interrupt enable
GLOB DIS[-]
Write to add to interrupt counter
GLOB ENA[-]
Write to subtract from interrupt counter
COUNTER[4:0]
Interrupt counter
INT ENABLE controls the interrupts. The control bits are as follows:
Name
INT EN
INT EN
INT EN
INT EN
INT EN
INT EN
INT EN
INT EN
TIM1
TIM0
RX
TX
MODU
SDI
SCI
DAC
Bits
7
6
5
4
3
2
1
0
INT ENABLE bits
Description
Enable Timer 1 interrupt
Enable Timer 0 interrupt
Enable UART RX interrupt
Enable UART TX interrupt
Enable AD modulator interrupt
Enable Data interrupt
Enable SCI interrupt
Enable DAC interrupt
Note: It may take upto 6 clock cycles before changing INT ENABLE has any effect.
Writing any value to INT GLOB DIS adds one to the interrupt counter INT COUNTER and effectively
disables all interrupts. It may take upto 6 clock cycles before writing to this register has any effect.
Writing any value to INT GLOB ENA subtracts one from the interrupt counter (unless INT COUNTER
already was 0). If the interrupt counter becomes zero, interrupts selected with INT ENABLE are restored. An interrupt routine should always write to this register as the last thing it does, because interrupts automatically add one to the interrupt counter, but subtracting it back to its initial value is the
responsibility of the user. It may take upto 6 clock cycles before writing this register has any effect.
By reading INT COUNTER the user may check if the interrupt counter is correct or not. If the register
is not 0, interrupts are disabled.
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10.9
VS1033 A
10. VS1033 REGISTERS
A/D Modulator Registers
Reg
0xC01E
0xC01F
Type
rw
rw
Reset
0
0
Name
ADM POWERDOWN
ADM DIVIDER
Interrupt registers, prefix AD
Abbrev[bits]
Description
DIV
A/D Modulator divider
DATA
A/D Modulator data
Bits
15
14:0
AD DIV bits
Description
1 in powerdown
Divider
ADM DIVIDER controls the AD converter’s sampling frequency. To gather one sample, 128 × n clock
cycles are used (n is value of AD DIV). The lowest usable value is 4, which gives a 48 kHz sample rate
when CLKI is 24.576 MHz. When ADM POWERDOWN is 1, the A/D converter is turned off.
AD DATA contains the latest decoded A/D value.
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10.10
VS1033 A
10. VS1033 REGISTERS
Watchdog v1.0 2002-08-26
The watchdog consist of a watchdog counter and some logic. After reset, the watchdog is inactive.
The counter reload value can be set by writing to WDOG CONFIG. The watchdog is activated by writing 0x4ea9 to register WDOG RESET. Every time this is done, the watchdog counter is reset. Every
65536’th clock cycle the counter is decremented by one. If the counter underflows, it will activate vsdsp’s internal reset sequence.
Thus, after the first 0x4ea9 write to WDOG RESET, subsequent writes to the same register with the
same value must be made no less than every 65536×WDOG CONFIG clock cycles.
Once started, the watchdog cannot be turned off. Also, a write to WDOG CONFIG doesn’t change the
counter reload value.
After watchdog has been activated, any read/write operation from/to WDOG CONFIG or WDOG DUMMY
will invalidate the next write operation to WDOG RESET. This will prevent runaway loops from resetting the counter, even if they do happen to write the correct number. Writing a wrong value to
WDOG RESET will also invalidate the next write to WDOG RESET.
Reads from watchdog registers return undefined values.
10.10.1
Reg
0xC020
0xC021
0xC022
Version 0.6,
Registers
Watchdog, prefix WDOG
Type Reset Abbrev
Description
w
0 CONFIG
Configuration
w
0 RESET
Clock configuration
w
0 DUMMY[-] Dummy register
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VS1033 A
10.11
10. VS1033 REGISTERS
UART v1.1 2004-10-09
RS232 UART implements a serial interface using rs232 standard.
Start
bit
D0
D1
D2
D3
D4
D5
D6
Stop
D7 bit
Figure 15: RS232 Serial Interface Protocol
When the line is idling, it stays in logic high state. When a byte is transmitted, the transmission begins
with a start bit (logic zero) and continues with data bits (LSB first) and ends up with a stop bit (logic
high). 10 bits are sent for each 8-bit byte frame.
10.11.1
Registers
Reg
0xC028
0xC029
0xC02A
0xC02B
UART registers, prefix UARTx
Type Reset Abbrev
Description
r
0 STATUS[4:0] Status
r/w
0 DATA[7:0]
Data
r/w
0 DATAH[15:8] Data High
r/w
0 DIV
Divider
10.11.2 Status UARTx STATUS
A read from the status register returns the transmitter and receiver states.
Name
UART
UART
UART
UART
UART
ST
ST
ST
ST
ST
FRAMEERR
RXORUN
RXFULL
TXFULL
TXRUNNING
UARTx STATUS Bits
Bits Description
4 Framing error (stop bit was 0)
3 Receiver overrun
2 Receiver data register full
1 Transmitter data register full
0 Transmitter running
UART ST FRAMEERR is set if the stop bit of the received byte was 0.
UART ST RXORUN is set if a received byte overwrites unread data when it is transferred from the
receiver shift register to the data register, otherwise it is cleared.
UART ST RXFULL is set if there is unread data in the data register.
UART ST TXFULL is set if a write to the data register is not allowed (data register full).
UART ST TXRUNNING is set if the transmitter shift register is in operation.
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VS1033 A
10. VS1033 REGISTERS
10.11.3 Data UARTx DATA
A read from UARTx DATA returns the received byte in bits 7:0, bits 15:8 are returned as ’0’. If there is
no more data to be read, the receiver data register full indicator will be cleared.
A receive interrupt will be generated when a byte is moved from the receiver shift register to the receiver
data register.
A write to UARTx DATA sets a byte for transmission. The data is taken from bits 7:0, other bits in the
written value are ignored. If the transmitter is idle, the byte is immediately moved to the transmitter shift
register, a transmit interrupt request is generated, and transmission is started. If the transmitter is busy,
the UART ST TXFULL will be set and the byte remains in the transmitter data register until the previous
byte has been sent and transmission can proceed.
10.11.4
Data High UARTx DATAH
The same as UARTx DATA, except that bits 15:8 are used.
10.11.5 Divider UARTx DIV
Name
UART DIV D1
UART DIV D2
UARTx DIV Bits
Bits Description
15:8 Divider 1 (0..255)
7:0 Divider 2 (6..255)
The divider is set to 0x0000 in reset. The ROM boot code must initialize it correctly depending on the
master clock frequency to get the correct bit speed. The second divider (D2 ) must be from 6 to 255.
The communication speed f =
TX/RX speed in bps.
fm
(D1 +1)×(D2 )
, where fm is the master clock frequency, and f is the
Divider values for common communication speeds at 26 MHz master clock:
Example UART Speeds, fm = 26M Hz
Comm. Speed [bps] UART DIV D1 UART DIV D2
4800
85
63
9600
42
63
14400
42
42
19200
51
26
28800
42
21
38400
25
26
57600
1
226
115200
0
226
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VS1033 A
10. VS1033 REGISTERS
10.11.6 Interrupts and Operation
Transmitter operates as follows: After an 8-bit word is written to the transmit data register it will be
transmitted instantly if the transmitter is not busy transmitting the previous byte. When the transmission
begins a TX INTR interrupt will be sent. Status bit [1] informs the transmitter data register empty (or
full state) and bit [0] informs the transmitter (shift register) empty state. A new word must not be written
to transmitter data register if it is not empty (bit [1] = ’0’). The transmitter data register will be empty
as soon as it is shifted to transmitter and the transmission is begun. It is safe to write a new word to
transmitter data register every time a transmit interrupt is generated.
Receiver operates as follows: It samples the RX signal line and if it detects a high to low transition, a
start bit is found. After this it samples each 8 bit at the middle of the bit time (using a constant timer),
and fills the receiver (shift register) LSB first. Finally the data in the receiver is moved to the reveive
data register, the stop bit state is checked (logic high = ok, logic low = framing error) for status bit[4],
the RX INTR interrupt is sent, status bit[2] (receive data register full) is set, and status bit[2] old state is
copied to bit[3] (receive data overrun). After that the receiver returns to idle state to wait for a new start
bit. Status bit[2] is zeroed when the receiver data register is read.
RS232 communication speed is set using two clock dividers. The base clock is the processor master
clock. Bits 15-8 in these registers are for first divider and bits 7-0 for second divider. RX sample
frequency is the clock frequency that is input for the second divider.
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10.12
VS1033 A
10. VS1033 REGISTERS
Timers v1.0 2002-04-23
There are two 32-bit timers that can be initialized and enabled independently of each other. If enabled,
a timer initializes to its start value, written by a processor, and starts decrementing every clock cycle.
When the value goes past zero, an interrupt is sent, and the timer initializes to the value in its start value
register, and continues downcounting. A timer stays in that loop as long as it is enabled.
A timer has a 32-bit timer register for down counting and a 32-bit TIMER1 LH register for holding the
timer start value written by the processor. Timers have also a 2-bit TIMER ENA register. Each timer is
enabled (1) or disabled (0) by a corresponding bit of the enable register.
10.12.1
Reg
0xC030
0xC031
0xC034
0xC035
0xC036
0xC037
0xC038
0xC039
0xC03A
0xC03B
Registers
Timer registers, prefix TIMER
Type Reset Abbrev
Description
r/w
0 CONFIG[7:0] Timer configuration
r/w
0 ENABLE[1:0] Timer enable
r/w
0 T0L
Timer0 startvalue - LSBs
r/w
0 T0H
Timer0 startvalue - MSBs
r/w
0 T0CNTL
Timer0 counter - LSBs
r/w
0 T0CNTH
Timer0 counter - MSBs
r/w
0 T1L
Timer1 startvalue - LSBs
r/w
0 T1H
Timer1 startvalue - MSBs
r/w
0 T1CNTL
Timer1 counter - LSBs
r/w
0 T1CNTH
Timer1 counter - MSBs
10.12.2 Configuration TIMER CONFIG
Name
TIMER CF CLKDIV
TIMER CONFIG Bits
Bits Description
7:0 Master clock divider
TIMER CF CLKDIV is the master clock divider for all timer clocks. The generated internal clock
fm
frequency fi = c+1
, where fm is the master clock frequency and c is TIMER CF CLKDIV. Example:
With a 12 MHz master clock, TIMER CF DIV=3 divides the master clock by 4, and the output/sampling
Hz
clock would thus be fi = 12M
3+1 = 3M Hz.
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VS1033 A
10. VS1033 REGISTERS
10.12.3 Configuration TIMER ENABLE
Name
TIMER EN T1
TIMER EN T0
TIMER ENABLE Bits
Bits Description
1 Enable timer 1
0 Enable timer 0
10.12.4 Timer X Startvalue TIMER Tx[L/H]
The 32-bit start value TIMER Tx[L/H] sets the initial counter value when the timer is reset. The timer
fi
interrupt frequency ft = c+1
where fi is the master clock obtained with the clock divider (see Chapter 10.12.2 and c is TIMER Tx[L/H].
Example: With a 12 MHz master clock and with TIMER CF CLKDIV=3, the master clock fi = 3M Hz.
Hz
If TIMER TH=0, TIMER TL=99, then the timer interrupt frequency ft = 3M
99+1 = 30kHz.
10.12.5
Timer X Counter TIMER TxCNT[L/H]
TIMER TxCNT[L/H] contains the current counter values. By reading this register pair, the user may get
knowledge of how long it will take before the next timer interrupt. Also, by writing to this register, a
one-shot different length timer interrupt delay may be realized.
10.12.6
Interrupts
Each timer has its own interrupt, which is asserted when the timer counter underflows.
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10.13
VS1033 A
10. VS1033 REGISTERS
I2S DAC Interface
The I2S Interface makes it possible to attach an external DAC to the system.
10.13.1 Registers
Reg
0xC040
I2S registers, prefix I2S
Type Reset Abbrev
Description
r/w
0 CONFIG[3:0] I2S configuration
10.13.2 Configuration I2S CONFIG
Name
I2S CF MCLK ENA
I2S CF ENA
I2S CF SRATE
I2S CONFIG Bits
Description
Enables the MCLK output (12.288 MHz)
Enables I2S, otherwise pins are GPIO
I2S rate, ”10” = 192, ”01” = 96, ”00” = 48 kHz
Bits
3
2
1:0
I2S CF ENA enables the I2S interface. After reset the interface is disabled and the pins are used for
GPIO.
I2S CF MCLK ENA enables the MCLK output. The frequency is either directly the input clock (nominal 12.288 MHz), or half the input clock when mode register bit SM CLK RANGE is set to 1 (2426 MHz input clock).
I2S CF SRATE controls the output samplerate. When set to 48 kHz, SCLK is MCLK divided by 8,
when 96 kHz SCLK is MCLK divided by 4, and when 192 kHz SCLK is MCLK divided by 2.
MCLK
SCLK
LROUT
SDATA
MSB
LSB
Left Channel Word
MSB
Right Channel Word
Figure 16: I2S Interface, 192 kHz.
To enable I2S first write 0xc017 to SCI WRAMADDR and 0x33 to SCI WRAM, then write 0xc040 to
SCI WRAMADDR and 0x0c to SCI WRAM.
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10.14
VS1033 A
10. VS1033 REGISTERS
System Vector Tags
The System Vector Tags are tags that may be replaced by the user to take control over several decoder
functions.
10.14.1 AudioInt, 0x20
Normally contains the following VS DSP assembly code:
jmpi DAC_INT_ADDRESS,(i6)+1
The user may, at will, replace the first instruction with a jmpi command to gain control over the audio
interrupt.
10.14.2
SciInt, 0x21
Normally contains the following VS DSP assembly code:
jmpi SCI_INT_ADDRESS,(i6)+1
The user may, at will, replace the instruction with a jmpi command to gain control over the SCI interrupt.
10.14.3
DataInt, 0x22
Normally contains the following VS DSP assembly code:
jmpi SDI_INT_ADDRESS,(i6)+1
The user may, at will, replace the instruction with a jmpi command to gain control over the SDI interrupt.
10.14.4
ModuInt, 0x23
Normally contains the following VS DSP assembly code:
jmpi MODU_INT_ADDRESS,(i6)+1
The user may, at will, replace the instruction with a jmpi command to gain control over the AD Modulator interrupt.
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VS1033 A
10. VS1033 REGISTERS
10.14.5 TxInt, 0x24
Normally contains the following VS DSP assembly code:
jmpi EMPTY_INT_ADDRESS,(i6)+1
The user may, at will, replace the instruction with a jmpi command to gain control over the UART TX
interrupt.
10.14.6
RxInt, 0x25
Normally contains the following VS DSP assembly code:
jmpi RX_INT_ADDRESS,(i6)+1
The user may, at will, replace the first instruction with a jmpi command to gain control over the UART
RX interrupt.
10.14.7
Timer0Int, 0x26
Normally contains the following VS DSP assembly code:
jmpi EMPTY_INT_ADDRESS,(i6)+1
The user may, at will, replace the first instruction with a jmpi command to gain control over the Timer
0 interrupt.
10.14.8
Timer1Int, 0x27
Normally contains the following VS DSP assembly code:
jmpi EMPTY_INT_ADDRESS,(i6)+1
The user may, at will, replace the first instruction with a jmpi command to gain control over the Timer
1 interrupt.
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VS1033 A
10. VS1033 REGISTERS
10.14.9 UserCodec, 0x0
Normally contains the following VS DSP assembly code:
jr
nop
If the user wants to take control away from the standard decoder, the first instruction should be replaced
with an appropriate j command to user’s own code.
Unless the user is feeding MP3 or WMA data at the same time, the system activates the user program
in less than 1 ms. After this, the user should steal interrupt vectors from the system, and insert user
programs.
10.15
System Vector Functions
The System Vector Functions are pointers to some functions that the user may call to help implementing
his own applications.
10.15.1 WriteIRam(), 0x2
VS DSP C prototype:
void WriteIRam(register i0 u int16 *addr, register a1 u int16 msW, register a0 u int16 lsW);
This is the preferred way to write to the User Instruction RAM.
10.15.2
ReadIRam(), 0x4
VS DSP C prototype:
u int32 ReadIRam(register i0 u int16 *addr);
This is the preferred way to read from the User Instruction RAM.
A1 contains the MSBs and a0 the LSBs of the result.
10.15.3
DataBytes(), 0x6
VS DSP C prototype:
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VS1033 A
10. VS1033 REGISTERS
u int16 DataBytes(void);
If the user has taken over the normal operation of the system by switching the pointer in UserCodec
to point to his own code, he may read data from the Data Interface through this and the following two
functions.
This function returns the number of data bytes that can be read.
10.15.4 GetDataByte(), 0x8
VS DSP C prototype:
u int16 GetDataByte(void);
Reads and returns one data byte from the Data Interface. This function will wait until there is enough
data in the input buffer.
10.15.5 GetDataWords(), 0xa
VS DSP C prototype:
void GetDataWords(register i0 y u int16 *d, register a0 u int16 n);
Read n data byte pairs and copy them in big-endian format (first byte to MSBs) to d. This function will
wait until there is enough data in the input buffer.
10.15.6
Reboot(), 0xc
VS DSP C prototype:
void Reboot(void);
Causes a software reboot, i.e. jump to the standard firmware without reinitializing the IRAM vectors.
This is NOT the same as the software reset function, which causes complete initialization.
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11
VS1033a PRELIMINARY
VS1033 A
11. DOCUMENT VERSION CHANGES
Document Version Changes
This chapter describes the most important changes to this document.
11.1
Version 0.6 for VS1033a, 2005-01-05
• ADPCM recording section added (section 9.4)
11.2
Version 0.5, 2005-10-21
• More detailed info about fast forward / rewind.
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VS1033 A
12. CONTACT INFORMATION
Contact Information
VLSI Solution Oy
Hermiankatu 6-8 C
FIN-33720 Tampere
FINLAND
Fax: +358-3-316 5220
Phone: +358-3-316 5230
Email: [email protected]
URL: http://www.vlsi.fi/
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