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參數(shù)資料
| 型號(hào)： | TMS320AV420 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Digital NTSC Encoder(數(shù)字NTSC編碼器) |
| 中文描述： | NTSC制式的數(shù)字編碼器（數(shù)字NTSC制式編碼器） |
| 文件頁(yè)數(shù)： | 5/18頁(yè) |
| 文件大小： | 487K |
| 代理商： | TMS320AV420 |
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TMS320AV420
DIGITAL NTSC ENCODER
SCSS015A – AUGUST 1994 – REVISED SEPTEMBER 1995
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
functional description
input format
The ’AV420 accepts input pixels in 24-bit RGB, 24-bit YUV 4:4:4 or the 16-bit YUV 4:2:2 formats. The input
format is controlled by FORM0, FORM1, and the pixels are input into the ’AV420 on the D0–D23 pixel bus.
Figure 1 shows the relationship between the input pixel R, G, B, Y and U, V values, and the corresponding
analog output waveform luminance and chrominance parameters.
D
(a) R, G, B, Y Data
16
235
100% Level
Black Level
t
D
(b) U, V Data
16 (–112)
240 (112)
100% Chroma
Saturation
128 (0)
0
100% Chroma
Saturation
t
Figure 1. Video Input Data and Waveform Parameters
The first 20 H of each field in the interlaced mode and of each frame in the noninterlaced mode are used for
vertical blanking (H is the RS170A line period of 63.56
μ
s). The active video lines are the subsequent 242.5 lines
in the interlaced mode and 242 lines in the noninterlaced mode. The first 128 pixels of each active video line
are used for horizontal blanking. The active video pixels are the subsequent 710 pixels. Figure 2 shows the RGB
and the YUV 4:4:4 video-input timing. Figure 3 shows the YUV 4:2:2 video-input timing.
MIN
TYP
MAX
UNIT
tsu1
th1
Data setup timing
10
ns
Data hold timing
10
ns
tstart
Data input start timing
128
13.5
106
109
ns
tactive
Data input duration
710
13.5
106
109
ns
tactive
Active Video Line
tstart
tsu
th
Valid Data
CLK135
HSYNC
D(23:0)
1
2
3
4
5
6
709 710
Figure 2. RGB and YUV 4:4:4 Video Data-Input Timing
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