参数资料
型号: CDB4955A
厂商: Cirrus Logic Inc
文件页数: 10/60页
文件大小: 0K
描述: EVALUATION BOARD FOR CS4955A
标准包装: 1
主要目的: 视频,视频处理
嵌入式: 是,其它
已用 IC / 零件: CS4955
主要属性: NTSC/PAL 数字视频编码器
次要属性: 图形用户界面,RS-232 接口
已供物品:
相关产品: CS4954-CQZR-ND - IC VID ENCODER NTSC/PAL 48-TQFP
598-1682-ND - IC VIDEO ENCODER NTSC/PAL 48TQFP
CS4954 CS4955
18
DS278F6
VSYNC stays low for 2.5 line-times and transitions
high with the beginning of line 315. Video input on
the V [7:0] pins is expected between line 336
through line 622.
5.2.7 Progressive Scan
The CS4954/5 supports a pseudo-progessive scan
mode for which “odd” and “even” numbered line
information is presented in “odd” numbered line
positions by varying the vertical blanking timing.
This preserves precise MPEG-2 frame rates of 30
and 25 frames per second. This mode is in contrast
to other digital video encoders, which commonly
support progressive scan by repetitively displaying
a 262 line field (524/525 lines for NTSC). The
common method is flawed: over time, the output
display rate will overrun a system-clock-locked
MPEG-2 decompressor and display a field twice
every 8.75 seconds.
5.2.8 NTSC Progressive Scan
VSYNC will transition low at line four to begin
field one and will remain low for three lines or
2574 pixel cycles (858 × 3). NTSC interlaced tim-
ing is illustrated in Figure 9. In this mode, the
CS4954/5 expects digital video input at the V [7:0]
pins for 240 lines beginning on active video line 22
and continuing through line 261.
NTSC Vertical Timing (odd field)
Line
HSYNC
VSYNC
FIELD
3
4
5
6
7
8
9
10
NTSC Vertical Timing (even field)
PAL Vertical Timing (odd field)
PAL Vertical Timing (even field)
264
265
266
267
268
269
270
271
265
1
2
3
4
5
6
7
311
312
313
314
315
316
317
318
Line
HSYNC
VSYNC
FIELD
Line
HSYNC
VSYNC
FIELD
Line
HSYNC
VSYNC
FIELD
Figure 6. Vertical Timing
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