NJU26108
■
General Description
SRS CSII 5.1 & TruSurround XT Decoder
■
Package
The NJU26108 is a digital signal processor that provides the function of Circle
Surround II 5.1 / TruSurroundXT and Mono-to-Stereo.
The NJU26108 processes the stereo matrix-encoded signal into spacious sound of 5.1
channels by Circle Surround II 5.1. Also non matrix-encoded audio signal can be
processed into effective spacious sound.
The decoded 2-channel signal can be converted into spacious 2-channel virtual
surround output by the TruSurroundXT technology.
The applications of NJU26108 are suitable for multi-channel products such as DVD
Receivers, AV Amplifiers, TV, Car Audio or ordinary audio products such as small
speakers system.
NJU26108FR1
■
FEATURES
•
5.1-Channel signal outputs by Circle Surround II 5.1
•
2-Channel outputs by SRS TruSurroundXT
•
Mono-to-Stereo function
•
LFE by SRS TruBass
•
SRS Focus
•
Two kinds of micro computer interfaces
I
2
C bus ( standard-mode / 100Kbps )
Serial Interface (4 lines: Clock, Enable, Input data, Output data)
■
Digital Signal Processor Specification
•
24bit Fixed-point Digital Signal Processing
•
Maximum System Clock Frequency
: 38MHz
•
Digital Audio Interface
: 2 Input ports / 3 Output ports
•
Master / Slave Mode
•
Master Mode MCK
:1/2 fclk, 1/3 fclk
ex. MCK = 384Fs(1/2) or MCK = 256Fs(1/3) at fclk=768Fs
•
Two kinds of micro computer interface
・
I
2
C bus (standard-mode/100kbps)
・
Serial interface (4 lines: clock, enable, input data, output data)
•
Power Supply
: 2.5V ( 3.3V Input tolerant )
•
Package
: QFP32-R1
The detail hardware specification of the NJU26108 is described in the “ NJU26100 Series Hardware Data
Sheet”.
Ver.2004-08-26
-1-
NJU26108
■
Function Block Diagram
AD1/SDIN
AD2/SSb
NJU26108
DSP ARITHMETIC UNIT
SERIAL AUDIO
INTERFACE
BCKO
LRO
24-BIT x 24-BIT
MULTIPLIER
ALU
L/R
SDO0
SDI0
SDI1
C/LFE
SDO1
BCKI
SL/SR
SDO2
LRI
SCL/SCK
SDA/SDOUT
SERIAL
HOST
INTERFACE
PROGRAM
CONTROL
RESETb
MCK
XI
XO
TIMING
GENERATOR
ADDRESS GENERATION UNIT
DELAY
RAM
DATA
RAM
FIRMWARE
ROM
GPIO AND
CONFIGURATION
INTERFACE
SEL1
Fig. 1 NJU26108 Block Diagram
■
DSP Block Diagram
NJU26108 Block Diagram
Dialog Clarity
Select L/R/L+R
Mono
To
Stereo
Circle Surround
II
Decoder
Mono Input Mode
CS decode
mode
C
L
R
Ls
Rs
Delay
Phanton Center
+
+
L
R
L
Output Channel Trimmer
Focus
TruBass Mixer (L/R,SL/SR,SW)
Lt
L
L
R
C
S
TruSurround
C
R
Ls
Rs
Sw
Master Volume
Input
Trimmer
L
R
Passive
Matrix
Rt
R
Stereo Input Mode
TruSurround/
Through mode
Focus
SL
SR
SW
Focus
+
80Hz
LPF
TruBass
L
R
Ls
Rs
SW
Delay
Fig. 2 NJU26108 Function Diagram
-2-
Ver.2004-08-26
NJU26108
■
Pin Configuration
VDDR
VDDR
VDDC
VDDC
VSSC
VSSR
24
VSSR
23
VSSC
22
21
20
19
18
17
SDI0
SDI1
TEST0
LRI
BCKI
MCK
BCKO
LRO
Fig. 3 NJU26108 Pin Configuration
25
WDC
VSSC
VDDC
RESETb
VSSO
XO
XI
VDDO
16
26
15
27
14
28
NJU26108
13
29
30
31
32
1
12
11
10
9
2
3
4
5
6
7
8
SDO0
SEL1
SCL/SCK
SDA/SDOUT
AD1/SDIN
AD2/SSb
SDO2
SDO1
■
Pin Description
Table 1 Pin Description
No. Symbol
I/O
Description
1
SDO2
O
Audio Data Output 2 S
L
/S
R
2
SDO1
O
Audio Data Output 1 C/SW
3
SDO0
O
Audio Data Output 0 L/R
*2
Select I
2
C or Serial bus
4
SEL1
I
5
SCL/SCK
I
I
2
C Clock / Serial Clock
6
SDA/SDOUT I/O
I
2
C I/O / Serial Output
7
AD1/SDIN
I
I
2
C Address / Serial Input
8
AD2/SSb
I
I
2
C Address / Serial Enable
9
VDDO
--
OSC Power Supply +2.5V
10
XI
I
X’tal Clock Input
11
XO
O
OSC Output
12
VSSO
--
OSC GND
13
RESETb
I
RESET (active Low)
14
VDDC
--
Core Power Supply +2.5V
15
VSSC
--
Core GND
*2
16
WDC
Clock for Watch Dog Timer
O
*1 I : Input, O : Output, I/O : Bi-directional
*2 SEL1 : Input, WDC : Output
No.
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Symbol
VDDC
VDDC
VSSC
VSSC
VDDR
VDDR
VSSR
VSSR
SDI0
SDI1
TEST0
LRI
BCKI
MCK
BCKO
LRO
I/O
--
--
--
--
--
--
--
--
I
I
I
I
I
O
O
O
Description
Core Power Supply +2.5V
Core Power Supply +2.5V
Core GND
Core GND
I/O Power Supply +2.5V
I/O Power Supply +2.5V
I/O GND
I/O GND
Audio Data Input 0 L/R
Audio Data Input 1 L/R
Connect to GND
LR Clock Input
Bit Clock Input
Master Clock Output
Bit Clock Output
LR Clock Output
Ver.2004-08-26
-3-
NJU26108
■
Audio Data Output
The NJU26108 audio interface provides industry standard serial data formats of I
2
S, MSB-first left-justified or MSB-first
right-justified. The NJU26108 audio interface provides two data inputs, SDI0 and SDI1, and three data outputs, SDO0,
SDO1 and SDO2, as shown in table 2 and 3. The input serial data is selected by the firmaware command.
Table 2
Pin No.
25
26
Serial Audio Input Pin
Symbol
SDI0
SDI1
Description
Audio Data Input 0 L / R
Audio Data Input 1 L / R
Table 3
Pin No.
3
2
1
Serial Audio Output Pin
Symbol
SDO0
SDO1
SDO2
Description
Front Lch/Rch Output
Center/Sub Woofer Output
Rear Lch/Rch Output
■
I C address
2
AD1 and AD2 pins are used to configure the seven-bit SLAVE address of the serial host interface. These pins offer
additional flexibility to SLAVE address. 4 addresses could be chosen by AD1 and AD2-pin. The AD1 and AD2-pin
addresses are decided by the connections of AD1 and AD2-pin. The AD1 and AD2 addresses should be the same level
as AD1 and AD2-pin connections.
.
Table 4
I
2
C Bus SLAVE Address
bit7
bit6
bit5
bit4
Bit3
bit2
bit1
bit0
1
1
0
0
1
1
1
AD2*
AD1*
R/W
*1 AD1 or AD2 address is 0 when AD1 or AD2-pin is “L”. AD1 or AD2 address is 1 when AD1 or AD2-pin is “H”.
The detail
I
2
C
bus timing of the NJU26108 is described in the “ NJU26100 Series Hardware Data Sheet”.
-4-
Ver.2004-08-26
NJU26108
■
Firmware Command Table
Host processor can control the NJU26108 via I2C bus or 4-Wire serial bus interface. The following table
summarizes the available user commands.
Table 5 NJU26108 Command
No. Command
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Set Task
CSII Mode
TruBass Mode
TruBass Base Control
Focus Mode
Focus Control
Mono Input Select
Sample Rate
Rear Space Gain
4 Ch. Stereo Mode
Delay
Master Volume
Input Trimmer
Left Volume
Right Volume
Left Volume
Center Volume
Sl Volume
Sr Volume
SubWoofer Volume
System Status
TruBass Base Control SW
TruBass Base Control Sl / Sr
Focus Control L / R
Focus Control Sl / Sr
NOP
Command Description
Set Task : Mono-Stereo, TruSurround, Focus, TruBass,
CSII 5.1, Input Select
Set CSII mode : Cinema / Music, Phantom Center,
Rear Boost, Full Band Width, 525 Mode
Set TruBass mode : Sr/Sl, Sub Woofer, L/R, Speaker Size
Set TruBass Base : Gang Mode, Mute, TruBass Level
Set Focus mode : Sl / Sr, L / R, C
Focus Control
Set Mono Input
: Gang, Mute, Focus Value
: L / R, L+R
: 0 ~ -15dB
: 0 ~ 10 ms
: 0 ~ -63dB
: 0 ~ -63dB
: 0 ~ -63dB
: 0 ~ -63dB
: 0 ~ -63dB
: 0 ~ -63dB
: 0 ~ -63dB
: 0 ~ -63dB
Set Sample Rate : 48, 44.1, 32 KHz
Set Rear Space Gain
Set Delay Time
Set Master Volume
Set Input Trimmer
Set Left Volume
Set Right Volume
Set Left Volume
Set Center Volume
Set Sl Volume
Set Sr Volume
Select 4 Ch. Stereo Mode : On / Off
Set SubWoofer Volume : 0 ~ -63dB
Set System Status : DSP Mode, Data Width, Serial Audio Mode,
Audio Clock, MCK clock
TruBass Base Control SW : Gang Mode, Mute, TruBass
Level
TruBass Base Control Sl / Sr : Gang Mode, Mute, TruBass
Level
Focus Control L / R
: Gang Mode, Mute, Focus
Level
Focus Control Sl / Sr
: Gang Mode, Mute, Focus
Level
Check DSP status
In respect to detail command information, request NJR.
Ver.2004-08-26
-5-
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