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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： | 24/25页 |
| 文件大小： | 112K |
| 代理商： | IBM39MPEGS422PBA17C |
IBM39MPEGS42x
IBM39MPEGSI
MPEG S422, MPEG S420 and MPEG SI Encoders
S422 Encoder Operations and Features
8 of 25
Sseries_sds_071701.fm.02
July 17, 2001
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 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. By starting 12 lines earlier
and ending four lines later than normal in each eld, a 512-line picture can be created (e.g. lines 10-265 in the
digital odd eld and lines 273-528 in the digital even eld).
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 through 310 are an active picture area, lines 311-312-1/2 and
312-1/2-335 are a blanking interval, and lines 336 through 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 compose the 576 lines of a given picture. By starting 14 lines earlier and extending two lines later than
normal in each eld, a 608-line picture can be created (e.g. lines 9-312 in the digital odd eld and lines 322-625 in
the digital even eld).
This feature provides the user the exibility to select the location of the rst active picture line by writing to Host
Register X’1B’.
Input/Output Formats
Out
In
4:2:2
Interlaced
4:2:0
Interlaced
4:2:2
Progressive
4:2:0
Progressive
4:2:2 Field
Real time
Not Supported
Real time
Not Supported
4:2:0 Field
Real time (1)
Real time
Real time (1)
Real time
4:2:2 Frame
Real time
Not Supported
Real time
Not Supported
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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