CS4952 查看數據表（PDF） - Cirrus Logic
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CS4952 Datasheet PDF : 44 Pages
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CS4952/53
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.
Analog
Field 1
VSYNC* Drops
523 524 525 1
2
3
4
5
6
7
8
9 10
22
Analog
Field 2
261 262 263 264 265 266 267 268 269 270 271 272
284
285
Analog
Field 3
VSYNC* Drops
523 524 525 1
2
3
4
5
6
7
8
9 10
22
Analog
Field 4
261 262 263 264 265 266 267 268 269 270 271 272
284
285
Burst begins with positive half-cycle
Burst begins with negative half-cycle
Figure 9. NTSC Video Interlaced Timming
DS223PP2
17
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