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参数资料
| 型号： | IBM39MPEGS422PBA17C |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA352 |
| 封装： | 35 X 35 MM, 2 MM HEIGHT, 1.27 MM PITCH, PLASTIC, BGA-352 |
| 文件页数： | 4/25页 |
| 文件大小： | 112K |
| 代理商： | IBM39MPEGS422PBA17C |
IBM39MPEGS42x
IBM39MPEGSI
MPEG S422, MPEG S420 and MPEG SI Encoders
S420 Encoder Operations/Features
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Sseries_sds_071701.fm.02
July 17, 2001
processed between elds of a given input frame, the result is unpredictable. There is no internal provision to
prevent this register from being changed between a pair of odd/even elds that make up a frame. In all conversion
modes, except
drop eld, the lter coefcients are 1/2.
Two adjacent vertical frame pixels are used to produce one chroma pixel in
frame convert mode.
Two adjacent vertical pixels of the same eld are used to produce one chroma pixel in
eld convert mode.
The chroma data in the even eld is dropped, and the chroma data in the odd eld is used for the entire picture in
drop eld mode.
Field convert mode is used for eld encoding and frame convert is used for frame encoding in the output convert
mode.
If the user requires a more accurate lter (i.e. a long tap lter), then it is recommended that an external conversion
mechanism be used.
Active Picture Area
For NTSC, the 525 lines of video are broken into two active picture areas and two vertical blanking intervals. Lines
1-20 are a blanking interval, lines 21 through 262-1/2 are an active picture area, lines 262-1/2 through 282-1/2 are
a blanking interval, and lines 282-1/2 through 525 are an active picture area. Line 14 is used for time code
information, and line 21 contains closed caption information.
A common implementation uses lines 22-261 (240 lines) from the rst active picture area and lines 285-524 (240
lines) from the second active picture area to comprise the 480 lines of a given picture.
For PAL the 625 lines of video are broken into two active picture areas and two vertical blanking intervals. Lines
624-625 and 1-22 are a blanking interval, lines 23-310 are an active picture area, lines 311-312-1/2 and 312-1/2-
335 are a blanking interval, and lines 336-623 are an active picture area. (i.e Lines 23 and 623 are counted as ’full’
active lines.)
Lines 23-310 (288 lines) from the rst active picture area and lines 336-623 (288 lines) from the second active
picture area comprise the 576 lines of a given picture.
A feature is available in the S-Series Encoders that provides the user the exibility to select the location of the rst
active picture line by writing to Host Register X’1B’. (See Section 7.28, “Pixel Interface Functional Enhancements”,
of the MPEG-2 S-Series Encoder User Application Guide for further details.)
Input/Output Formats
Out
In
4:2:2 Interlaced
4:2:0 Interlaced
4:2:2
Progressive
4:2:0
Progressive
4:2:0 Field
Real time (1)
Real time
Real time (1)
Real time
4:2:0 Frame
Real time (1)
Real time
Real time (1)
Real time
Note:
(1) Real time with 2-tap 4:2:2 to 4:2:0 lter
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