TB1274BFG datasheet(16/37 Pages) TOSHIBA

Part #	TB1274BFG

Description	LUMINANCE, CHROMA AND SYNCHRONIZING SIGNALS PROCESSOR IC FOR PAL / NTSC / SECAM COLOR TV

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Manufacturer	TOSHIBA [Toshiba Semiconductor]

Direct Link	http://www.semicon.toshiba.co.jp/eng

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TB1274BFG

2005-08-18

16

FUNCTION DESCRIPTION

VIDEO SELECT,

AUTO-SW

1) “AUTO-SW” = (1) Manual select

When “AUTO-SW” is (1) Manual select, input signal is selected by the BUS as Fig. 1 and Table 1.

Mainly, CVBS-OUT(pin 3) is used for the comb filter input, and Yvi-OUT(pin 11) is used for

synchronization(pin 2). Besides, on chroma line from video SW to main route, the peak detection is done

during the burst period. The result is responded to the Read BUS data, C ID.

CVBS1/Y1-IN

Main Y (to Y section)

Main C (to C section)

CVBS2/Y2-IN

CVBS3/Y3-IN

A

B

MIX

C1-IN

C2-IN

C3-IN

6dB

0dB

(from Comb filter) COMB Y-IN

(from Comb filter) COMB C-IN

CVBS-OUT (to Comb filter)

Yvi-OUT (to SYNC-IN)

Chroma ID

VIDEO-SW SECTION

SW1

SW3

SW2

SW4

SW5

SW6

Y

C

A

B

C

A

B

C

A

B

A

B

A

Fig. 1 Signal route at Video SW section

Table 1 Selected input and pin 3/11 output from Video SW section

SW mode

To Y/C section

Output from V-SW

BUS

DATA

1

2

3

4

5

6

Main Y

Main C

CVBS-out

Yvi-out

0000

A

CVBS1

0001

B

A

CVBS2

0010

C

A

CVBS3

0100

A

B

A

Y1

C1

Y1+C1

Y1

0101

B

A

Y2

C2

Y2+C2

Y2

0110

C

B

A

Y3

C3

Y3+C3

Y3

1000

A

B

COMB Y

COMB C

CVBS1

COMB Y

1001

B

A

B

COMB Y

COMB C

CVBS2

COMB Y

1010

C

A

B

COMB Y

COMB C

CVBS3

COMB Y

others

－

Don’t use.

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TB1274BFG Datasheet(PDF) 16 Page - Toshiba Semiconductor

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