CS4953 datasheet(17/44 Pages) CIRRUS

17 / 44 page

CS4952/53

DS223PP2

NTSC Interlaced

The CS4952/3 supports NTSC-M and PAL-M

modes where there are 525 total lines per frame and

two fixed 262.5 line fields per frame and 30 total

frames occuring per second. Please reference Fig-

ure 9 for NTSC interlaced vertical timing. Each

field consists of 1 line for closed caption, 240 ac-

tive lines of video plus 21.5 lines of blanking.

VSYNC field one transistions low at the beginning

of line 4 and will remain low for 3 lines or (858 x 3)

2574 pixel cycles. The CS4952/3 exclusively re-

serves line 21 of field one for closed caption inser-

tion. Digital video input is expected to be delivered

to the CS4952/3 V [7:0] pins for 240 lines begin-

ning on active video lines 22 and continuing

through line 261. VSYNC field two transistions

low in the middle of line 266 and stays low for 3

lines times and transitions high in the middle of line

269. The CS4952/3 exclusively reserves line 284 of

field two for closed caption insertion. Video input

on the V [7:0] pins is expected between lines 285

through line 525.

PAL Interlaced

The CS4952/3 supports PAL modes B, D, G, H, I,

N, and Combination N where there are 625 total

lines per frame and two fixed 312.5 line fields per

frame and 25 total frames occuring per second.

Please reference Figure 10 for PAL interlaced ver-

tical timing. Each field consists of 288 active lines

of video plus 24.5 lines of blanking.

Figure 9. NTSC Video Interlaced Timming

523

524

525

VSYNC* Drops

Analog

Field 1

261

262

263

Analog

Field 2

285

284

272

271

270

269

268

267

266

265

264

523

524

525

VSYNC* Drops

Analog

Field 3

261

262

263

Analog

Field 4

285

284

272

271

270

269

268

267

266

265

264

Burst begins with positive half-cycle

Burst begins with negative half-cycle

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