STV5345 데이터 시트보기 (PDF) - STMicroelectronics

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STV5345

TELETEXT DECODER WITH 8 INTEGRATED PAGES

STMicroelectronics 

STV5345 - STV5345/H - STV5345/T

Figure 4 : Composite Sync. Waveforms

LSP

0 4.66

EP

0 2.33

BP

0

32 34.33

27.33 32

64

64

59.33 64

All timings in µs

TCS

(interlaced)

621 622 623 624 625

1

2

(308) (309) (310) (311) (312)

3

4

5

6

TCS

(interlaced)

309 310 311 312 313 314

(1)

315 316 317 318 319

(2)

(3)

(4)

(5) (6)

TCS

(non-interlaced)

308 309 310 311 312

1

2

3

4

5

6

The number positions indicate the end of lines.

The Teletext composite synchronization signal (TCS), whether interlacing is present or not, comprise

three components.

a) the line-synchronization pulses (LSP).

b) the equalization pulses (EP)

c) the frame-synchronization pulses (BP).

The timing reference is specified by the descending edge of the signal LSP, with a tolerance spread of ± 100ns.

Figure 5 : Display Output Timing

A) LINE RATE

LSP (TCS)

0 4.66

R.G.B.Y (1)

0

16.67

40µs

display period

64

56.67

All timings in µs

8/25

B) FIELD RATE

lines 42 to 291 inclusive

(and 355 to 604 inclusive interlaced)

R.G.B.Y (1)

0

41

(1) Also BLAN in charac ter and box bla nking

display period

291 312

Line numbers

Horizontal directio n(line ) - Vertical direc tion (frame)

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