參數(shù)資料
型號(hào): TMC22153
廠商: RAYTHEON SEMICONDUCTOR
元件分類: 顏色信號(hào)轉(zhuǎn)換
英文描述: 8-Bit/10-Bit Digital Video Decoder(8位/10位數(shù)字視頻譯碼器)
中文描述: COLOR SIGNAL DECODER
文件頁數(shù): 60/84頁
文件大小: 414K
代理商: TMC22153
TMC22x5y
PRODUCT SPECIFICATION
60
P
Timing Parameters
Subcarrier Programming
The color subcarrier is produced by an internal 28 bit Direct
Digital Synthesizer (DDS) which is phase locked to the burst
signal of the digitized video input. The nominal frequency is
programmed into the DDS as follows:
FREQ = (number of subcarrier cycles per line / number of
pixels per line) * 2^28
An example would be NTSC subcarrier mode
FREQ = (227.5 / 910) * 2^28 = 4000000 hex
Horizontal Timing
The horizontal video line is broken down into four horizontal
timing parameters.
STS: The number of pixels between sync pulses
STB: The number of pixels between the nominal mid point
of sync and the start of the 16 pixel burst gate. This value is
modified depending upon the mode of operation.
Table 21. Timing Offsets
BTV: The number of pixels between the start of the 16 pixel
burst gate and the nominal start of active video.
AV: The number of active pixels in the active video line.
The difference between the sum of STB+BTV+AV sub-
tracted from STS provides the nominal front porch.
260 & 261
262
263 - 307
308
309
310
311
312
10
11
12
13
14
15
16
17
Table 20. Table of Line Idents, LID[4:0]
(cont.)
Line no:
LID
4-0
Standard
x
x
x
PAL
NTSC
x
Mode
Genlock
Line locked
Subcarrier
D2 mode
D2 mode
D1 mode
Offset required
-8
-8
-22
-12
-8
+12
Figure 27. Horizontal Timing
STB
AV
65-22x5y-68
STS
BTV
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