SNC710

16-bit Voice Engine

======== Contents ========

INTRODUCTION.........................................................................................................................3

FEATURES ...................................................................................................................................3

PIN ASSIGNMENTS....................................................................................................................4

SYSTEM DESCRIPTIONS .........................................................................................................5

4.1

ONNECTION

...............................................................................................................................5

4.2

EMORY

APPING

.....................................................................................................................6

4.3

YSTEM

LOCK

...........................................................................................................................6

4.4

I/O P

ORT

.....................................................................................................................................7

4.5

IMER

OUNTER

.........................................................................................................................8

4.6

DAC & PWM.............................................................................................................................8

ABSOLUTE MAXIMUM RATINGS .......................................................................................10

ELECTRICAL CHARACTERISTICS ....................................................................................10

APPLICATION CIRCUIT ........................................................................................................11

7.1

3V/16M C

RYSTAL

....................................................................................................................11

7.2

3V/16M ROSC.........................................................................................................................12

7.3

4.5V/16M C

RYSTAL

.................................................................................................................13

7.4

4.5V/16M ROSC......................................................................................................................14

BONDING PAD ..........................................................................................................................15

Ver. 1.3

April 3, 2003

SNC710

16-bit Voice Engine

1. INTRODUCTION

The SNC710 is a powerful voice engine, which is based on16-bit fixed-point DSP
architecture. This chip embedded 32K words hi-performance ROM and 2K words
RAM. This internal ROM is used to implement software synthesizer in order to provide
various flexible sound effects for users, such as 2kbps~24kbps voice compression,
4-CH wave-table melody etc.... Furthermore, the SNC710 also built-in a SONiX's
mask ROM interface, all the user's program and voice data should be stored in
external mask ROM. And SNC710 can execute user's program from this external
mask ROM.

2. FEATURES

-
-

-
-
-

Power supply: 2.4V ~ 3.6V (for 2 battery application)

3.6V ~ 5.1V (for 3 battery application)

Built-in a 16-bit DSP (Very Light Structure)
Software-based voice/melody processing
Rich Function Instruction Set
16MHz crystal or R-C type oscillator for system clock
8 MIPS CPU performance
I/O Ports:

16 I/O pins (P0.0~P0.15) and 8 input pins (P1.0~P1.7)
P0.15 with IR carrier signal

RAM size: 2K*16 bits
High performance program ROM: 32K*16
Watch-Mode for real time clock (32768HZ clock source)
9 Interrupt Sources

4 for Internal Timer (timer0, 1, 2 and RTC)
4 for External interrupt(P0.0~P0.3)
1 for DA or PWM

Three 8-bit timer with auto-reload function
Built in a 10-bit PWM Direct Drive circuit and a fixed current D/A output
Sampling Rate: 4KHz ~16KHz
Built-in software voice synthesizer (multiple bit-rate solution from 2Kbps ~ 24Kbps
@8K sampling rate)
Low Voltage Reset

Ver. 1.3

April 3, 2003

SNC710

16-bit Voice Engine

3. PIN ASSIGNMENTS

Symbol

I/O

Function Description

P0.0~P0.15

I/O I/O Port 0

P1.0~P1.7

I Input Port 1

VDD

I Positive power supply for digital I/O pad

GND

I Negative power supply for digital I/O pad &core

CVDD

I Positive power supply for DSP core & AD bus interface

BP0

O PWM output 1

BN0

O PWM output 2

VO0

O DA0 converter output

XIN/VR1

I High clock crystal input /RC oscillator input

XOUT/VR2

I/O High clock crystal output/RC oscillator input

LXIN

I Low clock oscillator input

LXOUT

O Low clock oscillator output

CKSEL

I Crystal/RC oscillator system clock select

ALECLK

O System Clock output

CEB

O External ROM Enable , active low

READY

I/O Data Ready(I)/ Reset(O)

CLKIN

I Bus system clock in

CEIN

I External ROM enable in

AD[0..7]

I/O ROM Address/Data Bus (AD Bus)

RST

I Chip reset (active low)

TestM I

TEST

EXTM

I External ROM Share Mode

Ver. 1.3

April 3, 2003

SNC710

16-bit Voice Engine

4. SYSTEM DESCRIPTIONS

4.1 Connection

D[0..7]

ALECLK

READY

ALECLK

D[0..7]

CE\

Mask

ROM #1

CE\

SNC710

BS0

BS1

BS2

BS3

BS4

ALECLK

D[0..7]

Mask

ROM #2

BS0

BS1

BS2

BS3

BS4

CE\

READY

CLKIN

Figure-1

The SNC710 is a ROM-less DSP architecture, but it still built-in 32K hi-speed ROM for
software voice synthesizer. All the user's program and voice data are stored in
external mask ROM that provided by SONiX. In Figure-1, show out the system
connection between SNC710 and external mask ROM. Each mask ROM both has
several bank select pins (BSn) to specify the memory region, and SNC710 allows user
to connect totally 4 external mask ROMs.
The SNC710 built-in an 8-bit AD (address/data) bus, which connect to SONiX's mask
ROM. And SONiX's mask ROM provides encryption code function to protect user's
program to avoid illegal copy. In SONiX's compiler system, user can assign his own
ID-Code to protect his program and data.

Ver. 1.3

April 3, 2003

Электронный компонент: SNC710