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STV6412B中文资料

July 2008 Rev 11/32

STV6412B

Audio/video switch matrix

Features

■I2C bus control

■Standby mode with interrupt signal output ■

Video section

– 4 CVBS inputs, 3 CVBS outputs (one with selectable chroma trap filter)– 3 Y/C inputs, 2 Y/C outputs

–Switchable LPFs (low pass filters) on 6 inputs

–6dB gain on all CVBS/Y and C outputs –Integrated 150Ω buffers – 1 Y/C adder

– 2 RGB/FB inputs, 1 tri-state RGB/FB output with 6dB adjustable gain (from +3dB to +9dB)

–Video muting on all outputs – 2 slow blanking inputs/outputs

–Sync bottom clamp on all CVBS/Y and RGB inputs, average clamp on C inputs –SVHS switch on C VCR output –Bandwidth: 15MHz

–Crosstalk: 50dB minimum

■

Audio section

– 4 Stereo inputs, 3 stereo outputs – 1 mono-sound output

–Stereo-to-mono sound capability

–0/6/9dB selectable gain on one stereo input

–Full range volume control with soft control –Audio muting on all outputs

Description

The STV6412B is a highly integrated I2C bus-controlled audio and video switch matrix, optimized for use in digital set-top box

applications. It provides all the audio and video routings required in a full two-SCART set-top box design.

In an LQFP64 (14 × 14 × 1.4mm) package, the STV6412B is compatible with the STV6412A.Table 1: Device summary

Order code Packaging STV6412BD Tray

STV6412BDT

Tape and reel

https://www.wendangku.net/doc/1618951824.html,

STV6412B

1General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1I/O pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.1Latch up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.3Audio section characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.4Video section characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.5Chroma section characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.6Blanking section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.6.1Fast blanking section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.6.2Interrupt output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.6.3Address selection input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.7I2C bus characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3I2C bus selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.1I2C bus addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4Input/output groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5Application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

6Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

6.1Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

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STV6412B General information

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1 General information

General information STV6412B

4/32

1.1

I/O pin description

Table 1.

I/O pin description

Pin No.Symbol

Description

1VCC

+5V supply

2CVBSIN_AUX CVBS input from auxiliary 3DECV

Video decoupling capacitor 4Y/CVBSIN_ENC Y/CVBS input from encoder 5GND Ground

6YIN_ENC Y input from encoder

7RIN_AUX Audio right input from auxiliary 8CIN_ENC Chroma input from encoder 9LIN_AUX Audio left input from auxiliary 10R/CIN_ENC Red/Chroma input from encoder 11RIN_ENC Audio right input from encoder 12GIN_ENC Green input from encoder 13LIN_ENC Audio left input from encoder 14BIN_ENC Blue input from encoder 15NC Not connected

16DECA Audio decoupling capacitor 17GND

Ground

18Y/CVBSIN_VCR Y/CVBS input from VCR SCART 19LIN_VCR Audio left input from VCR SCART 20RIN_VCR Audio right input from VCR SCART 21CVBSIN_TV CVBS input from TV SCART 22LIN_TV Audio left input from TV SCART 23

RIN_TV

Audio right input from TV SCART

24VCCA (see Figure 2)

9V audio supply voltage output if VCCAO is used as 12V supply voltage input or

9V audio supply voltage input, VCCAO must be used as 9V supply voltage input 25GNDA Audio ground 26NC

Not connected

27ROUT_CINCH Audio right output to CINCH 28LOUT_CINCH Audio left output to CINCH 29ROUT_VCR Audio right output to VCR SCART 30

LOUT_VCR

Audio left output to VCR SCART

STV6412B General information

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31VCCAO (see Figure 2)12V supply voltage input, VCCA is regulated 9V output for decoupling or

9V supply voltage input, VCCA must be used as 9V supply voltage input 32ROUT_TV Audio right output to TV SCART 33LOUT_TV Audio left output to TV SCART 34FILTER Chroma trap filter

35AOUT_RF Audio (L+R) output to RF modulator 36VOUT_RF CVBS video output to RF modulator 37VCCB5Video output buffer supply pin 38BOUT_TV Blue output to TV SCART 39VCCB4Video output buffer supply pin 40GOUT_TV Green output to TV SCART 41GNDB Video buffer ground

42R/COUT_TV Red/Chroma output to TV SCART 43VCCB3

Video output buffer supply pin 44Y/CVBSOUT_TV Y/CVBS output to TV SCART 45VCCB2Video output buffer supply pin 46COUT_VCR Chroma output to VCR SCART 47VCCB1

Video output buffer supply pin 48Y/CVBSOUT_VCR Y/CVBS output to VCR SCART 49FBOUT_TV Fast blanking output to TV SCART 50FBIN_VCR Fast blanking input from VCR SCART 51FBIN_ENC Fast blanking input from encoder 52NC Not connected 53VDD +5V I2C supply 54ADD I2C address selection 55SCL I2C bus clock 56SDA I2C bus data 57GND Ground digital 58IT_OUT Interrupt output

59SLB_TV Slow blanking input/output from TV SCART 60R/CIN_VCR Red input (or C input) from VCR SCART 61SLB_VCR Slow blanking input/output from VCR SCART 62

GIN_VCR

Green Input from VCR SCART

Table 1.

I/O pin description (continued)

Pin No.Symbol

Description

General information STV6412B

6/32

Figure 2.Power supply configuration

63VCC12+12V supply

BIN_VCR

Blue input from VCR SCART

Table 1.

I/O pin description (continued)

Pin No.Symbol

Description

9 volt output

CCA (24)

VCCAO (31)

STV6412B

12V

Audio ground

VCC12 (63)

In applications where a 12 volt supply from slow blanking is used to derive the internal audio 9 volt supply voltage, the VCCAO pin must be connected to the 12 volt supply as shown in the example. The VCCA pin will show the regulated 9 volt audio supply voltage which must be decoupled by capacitors.

V In applications having a dedicated audio supply voltage, the VCCAO pin must be connected together with the VCCA pin to the audio supply as shown in the example. The VCCA pin acts as power supply input for the internal audio block.

VCCA (24)

VCCAO (31)

STV6412B

Audio ground

9 volt input

STV6412B General information

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General information STV6412B

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Figure 4.

STV6412B functional block diagram

R/C G B

CVBS Audio L Audio R CVBS/Y Audio L Audio R Slow blanking

SCART1TV

CVBS Audio L+R

CVBS Audio L Audio R

RF MOD

AUX

Micro

Interrupt

RGB and FB switches

CVBS/Y switches

Chroma switches

Audio switches

Slow blanking I/O control

Audio L Audio R

CINCH output

R/C G B

Fast blanking CVBS/Y

C Audio L Audio R Y

Encoder

R/C G B

Fast blanking CVBS/Y Audio L Audio R CVBS/Y Audio L Audio R Slow blanking

SCART2VCR

Fast blanking

STV6412B

STV6412B Electrical characteristics

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2 Electrical characteristics

2.1 Latch up

At an ambient temperature of 25°C , all pins meet the following specifications:

I trigger =200 mA or I trigger =-200 mA.

2.2 Recommended operating conditions

T AMB =25°C, V CCAO = 12V , V CC = 5V , V CC12 = 12V , V DD = 5V ,

R LOUTA = 10k Ω, R LOUTV = 150Ω, unless otherwise specified.

Table 2: Absolute maximum ratings

Symbol Parameter

Value Unit V CC12Supply voltage for slow blanking sections 13.2V V CCAO Supply voltage for audio drivers

13.2V V CCA Supply voltage for internal digital audio parts 10.0V V DD

Supply voltage for digital parts

6.0V V CC , V CCB1Supply voltage for video sections

6.0V

V IN

Input voltage at pin (in reference to GND)

Audio pins Video pins Bus pins

Slow blanking pins

0, V CCA

0, V CC or V CCBI

0, 5.50, V CC12

V ESD

Maximum ESD Voltage allowed (human body model:

100 pF capacitor discharged through 1.5 k Ω serial resistor)

±4

Table 3: Thermal data

Symbol Parameter

Value Unit R thJA Maximum junction-to-ambient thermal resistance 48°C/W T STG Storage temperature

-20 to +150°C T OPER Operating free air temperature range 0 to +70°C T j

Maximum junction temperature

150

°C

Table 4: Recommended operating conditions

Symbol Parameter

Test conditions

Min

Typ

Max

Unit

Supply voltages

V DD Digital supply voltage 4.755 5.25V V CCAO Audio operating supply voltage - Decoupling capacitor on V CCA

- Connected to V CCA

11.28.512912.89.5V V CC

Video operating supply voltage

4.75

5.25

Electrical characteristics

STV6412B

10/32

2.3 Audio section characteristics

T AMB =25°C, V CCAO = 12V , V CC = 5V , V CC12 = 12V , V DD = 5V ,

R GA = 600Ω, R LOUTA = 10k Ω, R GV = 50Ω, R LOUTV = 150Ω, unless otherwise specified.

V CC12

Slow blanking control supply voltage

11.2

12.8

Active mode (all channels ON)

I DD Digital supply current V DD = 5V

610mA I CCA

Audio supply current V CCAO = 12V , no load 815mA

I CCV

Total video supply current (V CC +V CCB1+V CCB2+V CCB3+V CCB4+V CCB5)

V CC = 5V , no load, LPF OFF V CC = 5V , no load, LPF ON V CC = 5V , with load, LPF OFF V CC = 5V , with load, LPF ON 3550486345656280mA

I CC12

12V supply current V CC12 = 12V SLB input mode

SLB output mode, no load

Standby mode (all channels OFF + LPF OFF)

I DD Digital supply current V DD = 5V

610

mA I CCAstd Audio supply current V CCA0 = 12V , no load 3mA I CCVstd

Total video supply current

V CC = 5V

Table 4: Recommended operating conditions (continued)

Symbol Parameter

Test conditions

Min Typ Max Unit Table 5.

Audio section characteristics

Symbol

Parameter

Test conditions

Min

Typ

Max

Unit

SVR100Supply voltage rejection

V RIPPLE = 500mV RMS at 100Hz, Gain= 0dB,

DECA filter cap = 47μF DECA filter cap = 220μF 60

7080dB

SVR1K Supply voltage rejection V RIPPLE = 500m V RMS at 1kHz,Gain = 0 dB 7080dB V INDC Input DC level V CCA = 9V

3.2

V V INAC Input signal amplitude 2

V RMS R IN

Input resistance

3050k Ω

R INmatch Input resistance matching ±2

±10

%F RANGE

Bandwidth

-3dB, 0.5V RMS, R LOAD = 10k Ω, Gain = 0dB

kHz

Flatness Spread of gain in audio band

-0.5V RMS, 20Hz to 20kHz, Gain = 0dB

0.5

STV6412B Electrical characteristics

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Channel separation, from audio inputs

Between L & R of TV outputs V IN =0.5V RMS at 1kHz, on 1 input,

R LOAD = 10k Ω

, Gain = 0dB 80

9074dB

Ci Channel isolation from video inputs

V IN = 1V pp at 15kHz, on one point 85dB V OUT Output DC level V CCA = 9V

V CCA/2

V V OFF DC offset change Switching between inputs

1±15mV R OUT Output resistance 60

120ΩPHD

Phase difference

f = 1 kHz, 1 V RMS input on each input channel

3° deg.

ASN S/N ratio

f = 1 kHz, 1 V RMS input (Gain = 0dB) weighted CCIR 468-4 quasi peak

eNI Equivalent RMS input voltage noise BW = 20Hz to 20kHz flat, Gain = 0dB

μV G00dB gain 0.5 V RMS, R LOAD = 10k Ω, Gain = 0dB

-0.5

+0.5

dB G STEP Gain step

-62dB to +6dB (see Figure 5)

dB G MA TCH1Gain matching between different

inputs of one output

V IN = 0.5V RMS, 1kHz, Gain = 0dB

-0.50.5dB G MA TCH2

Gain matching between left/right

outputs of one input channel V IN = 0.5V RMS, 1kHz, Gain = 0dB

-0.50.5

THD0THD6THD9Total harmonic distortion ENC Input at 0dB ENC Input at 6dB ENC Input at 9dB V OUT = 0.5V RMS, 1kHz, LPF @ 80kHz

0.010.010.01

0.10.10.1%%%V CL Output clipping level THD = 0.2%, 1kHz 2.1 2.3V RMS R L Output load resistance V IN = 1V RMS, THD = 0.3%, Gain = 0dB

2 2.25

k ΩMute

Mute suppression

V IN = 0.5V RMS, on one point

-90

Table 5.

Audio section characteristics (continued)

Symbol Parameter

Test conditions

Min Typ Max

Unit

Electrical characteristics STV6412B

12/32

2.4 Video section characteristics

T AMB =25°C, V CCAO = 12V , V CC = 5V , V CC12 = 12V , V DD = 5V

Table 6.

Video section characteristics

Symbol Parameter

Test conditions Min

Typ Max

Units V DCIN DC input level Bottom sync pulse 2V I CLAMP Clamping current at V DCIN -400mV 12mA I LEAK Input leakage current V IN = V DCIN +1V

110 μA C IN Input capacitance 2

pF V IN Max input signal V CC = 5V 1.5V PP DYN Dynamic output signal

V CC = 5V

3V PP BW

Bandwidth at -3dB without LPF

Y/CVBS RGB

Y/C mixer (on VOUT -RF)V IN = 1V PP V IN = 1V PP

V IN = 1V PP , V INC = muted

10108

151510

MHz MHz MHz

Flatness

Spread of gain in video band (15 kHz to 5 MHz)

Y/CVBS RGB

Y/C Mixer (on VOUT -RF)V IN = 1V PP V IN = 1V PP

V IN = 1V PP , V INC = muted ±0.5±0.5±1.5dB dB dB BW LPF Low pass filter bandwidth at -3dB V IN = 1V PP , CL = 10pF 7.5MHz

ATT Low pass filter attenuation 27 MHz

-47-36dB CTi

Crosstalk isolation between Input channel

V IN = 1V PP at

f =4.43MHz, on one point

STV6412B Electrical characteristics

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Note:1

S/N = 20 log (V OUT Black to White = 0.7 V PP / V Noise (mV RMS ) weighted CCIR 567).

2.5 Chroma section characteristics

T AMB =25°C, V CCAO = 12V , V CC = 5V , V CC12 = 12V , V DD = 5V

R GA = 600Ω, R LOUTA = 10k Ω, R GV = 50Ω, R LOUTV = 150Ω, unless otherwise specified.

CTo Crosstalk isolation between output channel

V IN = 1V PP at

f =4.43MHz, on one point, R LOAD = 150Ω

50dB R OUT Output resistance 510ΩG RGB Gain at RGB outputs

V IN = 1V PP , Gain set to 6dB

5.56

6.5dB G RGBM

Gain matching between R, G, B

V IN = 1V PP , Gain set to 6dB -0.300.3dB G RGBSTEP Step of gain 3dB to 6dB 0.751 1.25dB G YCVBS Gain on Y ,/CVBS channels V IN = 1V PP 5.56 6.5dB G YCVBSM Gain matching between Y , CVBS inputs

V IN = 1V PP -0.5

00.5dB DC OUT

DC output voltage

Bottom sync pulse 0.6V DC OUT RF RF output voltage Bottom sync pulse

1V DPHI Differential phase V IN = 1V PP at f = 4.43MHz 15° deg.DG Differential gain V IN = 1V PP at f = 4.43MHz 1

5%Mute Mute suppression V IN = 1V PP at f = 5 MHz on one point

-55

dB LNL Luminance non-linearity 0.3

%VSN

Video S/N ratio

Refer to Note 1 65

Table 6.

Video section characteristics (continued)

Symbol Parameter

Test conditions Min

Typ Max

Units Table 7.

Chroma section characteristics

Symbol Parameter

Test conditions

Min.

Typ.Max.

Units V DCIN DC input level 3V R IN Input resistance 30

50k ΩC IN Input capacitance 2

pF V IN Max input signal 1.5V PP DYN Dynamic output signal 3V PP DC OUT DC output VCR voltage 2.2V CBW Chroma bandwidth

C IN = 1V PP at -3db

15MHz CTi

Crosstalk isolation between Input channel V IN = 1V PP at f = 4.43MHz, on one input

Electrical characteristics STV6412B

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2.6 Blanking section

T AMB =25°C, V CCAO = 12V , V CC = 5V , V CC12 = 12V , V DD = 5V , R LOUTA = 10k Ω, R LOUTV = 150Ω, unless otherwise specified.

2.6.1

Fast blanking section

CTo Crosstalk isolation between output channel V IN = 1V PP at f = 4.43MHz, on one input, R LOAD = 150Ω50dB R OUT Output resistance 5

10ΩG OUTC Gain at OUTC

V IN = 1V PP 5.56 6.5dB G CM Gain matching between C inputs V IN = 1V PP

-0.50

0.5dB Mute Mute suppression

V IN = 1V PP at f = 4.43 MHz ,on one input

-55

dB CToYdel Chroma to luma delay, source Y/C

Pin other than VOUT_RF ,V PP @ 4.43MHz,

20ns CToYdel Chroma to luma delay, source Y/C Pin VOUT_RF

ns Z COUT_VCR

Output impedance when switched to ground 2.7V applied to COUT_VCR with series 75Ω Resistor

2Ω

Table 7.

Chroma section characteristics (continued)

Symbol Parameter

Test conditions

Min.

Typ.Max.

Units Table 8.

Blanking section

Symbol Parameter

Test conditions

Min

Typ

Max

Units

Input mode SLBlow Input low level threshold 2.5 3.254V SLBhigh Input high level threshold 7.5

8.259V I IN

Input current

100

μA

Output mode SLBlow Output low level (https://www.wendangku.net/doc/1618951824.html,)00.02 1.5V SLBmed Output medium level (ext. 16/9)5 5.75 6.5V SLBhigh

Output high level (ext. 4/3)

Table 9.

Fast blanking section

Symbol Parameter

Test conditions

Min

Typ

Max

Units

Input mode

FBlow/high Input low/high level threshold

0.40.70.9V I IN

Input current

μA

Output mode

STV6412B Electrical characteristics

15/32

2.6.2 Interrupt output

Refer to Note 1

2.6.3

Address selection input

Note:1

The interrupt is forced low when a change is detected on slow blanking inputs. It can be used in standby mode to wake up the microprocessor. It is released when the I2C bus register is read.

FB LOW Output low level R LOAD = 150Ω

0.5

V FB HIGH

Output high level

3.0

3.4

3.8

FB DEL

Fast blanking RGB delay At 50% on digital RGB transients, at 2V on FB rise transient, at 1V on FB fall, C LOAD = 10pF maximum

15ns

FB TRANS

FB transitions at FB output

Rise Time Fall Time

C LOA

D = 10pF maximum between 10% and 90%between 90% and 10%

1010ns ns

Table 9.

Fast blanking section (continued)

Symbol Parameter

Test conditions Min

Typ

Max Units Table 10.

Interrupt output

Symbol Parameter

Test conditions Min.

Typ.

Max.Units IT -Leak High level leakage External pull-up to 5V 10μA IT -Low

Output low level (active)

I IN = 0mA

I IN = 1mA

0.30.7

V V

Table 11.Address selection input

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Units

ADDsel_L Address selection low level 0

0.2V ADDsel_H Address selection high level 2.5

V DD V I LEAK

Leakage current

μA

Electrical characteristics STV6412B

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2.7 I2C bus characteristics

T AMB =25°C, V CCAO = 12V , V CC = 5V , V CC12 = 12V , V DD = 5V , R LOUTA = 10k Ω, R LOUTV = 150Ω, unless otherwise specified.

Table 12.

I2C bus characteristics

Symbol Parameter

Test conditions

Min

Typ

Max

Units

SCL

V IL Low level input voltage -0.3 1.5V V IH High level input voltage 2.3 5.5V I LI Input leakage current V IN = 0 to 5.5V

-10

10μA f SCL Clock frequency 400kHz t R Input rise time 1.5V to 3V 1μs t F Input fall time 1.5V to 3V 300ns C I Input capacitance

SDA

V IL Low level input voltage -0.3 1.5V V IH High level input voltage 2.3 5.5V I LI Input leakage current V IN = 0 to 5.5V

-10

10μA C I Input capacitance 10pF t R Input rise time 1.5V to 3V 1μs t F Input fall time

3V to 1.5V 300ns V OL Low level output voltage I OL = 3mA 0.4V t F Output fall time 3V to 1.5V 250ns C L

Load capacitance

400

Timing: SCL frequency = 400 kHz t LOW Clock low period 1.3μs t HIGH Clock high period 0.6μs t SU,DA T Data setup time 100ns t HD,DAT Data hold time

0340

ns t SU,STO Setup time from clock high to stop 0.6μs t BUF Start setup time following a stop 1.3μs t HD,ST A Start hold time

0.6μs t SU,STA

Start setup time following clock low to high transition

0.6

μs

STV6412B Electrical characteristics

17/32

Figure 6.

I2C bus timing

(start, stop)

SDA

SCL

t BUF

t LOW

t HD,STA

t R

SDA

t HD,DA T

t SU,STA

t HIGH

t SU,DAT

t F

t SU,STO

I2C bus selection STV6412B

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3 I2C bus selection

Data transfers follow the usual I2C format; that is, after the start condition (S), a 7-bit slave address is sent, followed by an eighth bit (W) that determines whether the data direction is Read (W=1) or Write (W=0). An 8-bit sub-address is sent to select a register, followed by an 8-bit data word to be included in the register. The IC’s I2C bus decoder enables the automatic incrementation mode in write mode.

The circuit operates at clock frequencies of up to 400 kHz.Table 13.

String format

Write only mode (S = Start condition, P = Stop condition, A = Acknowledge)

Table 14.

Read only mode

Table 15.

Slave address

Table 16.Auto increment mode

3.1 I2C bus addresses

Write address: 1001 01X0, read address: 1001 01X1

Address selection pin grounded: X = 0, write address = 94(hex), read address = 95(hex)Address selection pin to supply: X = 1, write address = 96(hex), read address = 97(hex)

SLAVE ADDRESS

SUB-ADDRESS

DATA

SLAVE ADDRESS

DATA

Address A6A5A4A3A2A1A0Value

S SLAVE ADDRESS 0A SUB-ADDRESS A DATA0A

DATA1

....

DA TAn

Sub-address

Sub-address +1Sub-address + N

Table 17.

Input signal summary (write mode)

Reg Addr (Hex)Data

Audio 00h

TV stereo mono

TV 0/6dB TV volume-62dB to 0dB - 2dB steps

Soft volume mode

01h

VCR stereo mono Not used (see Note 1)

VCR audio switch control

CINCH audio gain

TV/CINCH audio switch control

STV6412B I2C bus selection

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Note:1Unused data must be set to “0”.

Video 02h

VCR chroma muted VCR video and chroma switch control

TV chroma

muted TV video and chroma switch control

03h RGB and FB tri-state

RGB gain

RGB switch control

Fast blanking mode/input selection

Miscellaneous 04h

IT enable

SLB mode

Low pass filter control

VCR-C output control

RF trap filter control RF adder control

TV R or C output selection

05h VCR slow blanking TV slow blanking

ENC audio input gain

0/6/9dB

VCR R/C

sub

clamp

ENC R/C

sub clamp

STB-BY 06h

RF outputs TV outputs CINCH outputs VCR outputs AUX inputs TV inputs VCR inputs ENC inputs

Table 17.

Input signal summary (write mode) (continued)

Reg Addr (Hex)Data

Table 18.

TV audio output

Reg Addr (Hex)

Description

Bits

Data

Comments

d6d5d4d3d2d1d000h

Soft volume change 1X X X X X X X X X X X X X X 01Active Disabled

Level adjustment 5X X X X 010*******X X 0dB

-62dB (-2dB/step)6dB extra gain

1X X 01X X X X X X X X X X X X 0dB +6dB TV stereo or mono mode

X X

0 = Stereo 1 = Mono

I2C bus selection STV6412B

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Table 19: Audio selection and VCR audio output

Reg Addr (Hex)

Description

Bits

Data

Comments

d7d6d5d4d3d2d1d001h

TV & CINCH audio output selection

X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 000011110011001101010101Muted

Encoder L/R selected VCR L/R selected AUX L/R selected TV L/R selected Not allowed Not allowed Not allowed CINCH audio gain 1

X X X X X X X X 01X X X X X X 0dB

Follow TV gain VCR audio output selection

X X X X X X X X 00110101X X X X X X X X X X X X X X X X Muted

Encoder L/R selected TV L/R selected AUX L/R selected VCR stereo or mono mode

X X

0 = Stereo 1 = Mono