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參數(shù)資料
| 型號(hào)： | IBM39MPEGS420PBA18C |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA352 |
| 封裝： | 35 X 35 MM, 2 MM HEIGHT, 1.27 MM PITCH, PLASTIC, BGA-352 |
| 文件頁數(shù)： | 3/25頁 |
| 文件大?。?/td> | 112K |
| 代理商： | IBM39MPEGS420PBA18C |
IBM39MPEGS42x
IBM39MPEGSI
MPEG S422, MPEG S420 and MPEG SI Encoders
Sseries_sds_071701.fm.02
July 17, 2001
S420 Encoder Operations/Features
11 of 25
For the various combinations of the above parameters, the encoded bitstream VBV size, prole and level elds are
set according to the following table:
Note: Combinations listed as INVALID will cause the encoder to either automatically adjust conicting parameters
to be consistent or hang after initialization.
The VBV buffer size may alternatively be specied by the user via command code X'0005' to Host Register X'3D'.
Picture Format
The encoder supports combinations of progressive and interlaced video formats as specied in the Table entitled:
“Input/Output Formats,” on page 12.
Input Pixel Interface
The pixel data interface will accept raster scanned digital video data up to:
– For NTSC, 720x480 pixels/frame at 30 frames per second
– For PAL, 720x576 pixels/frame at 25 frames per second
Data is accepted at the pixel interface at a nominal rate of 13.5 MHz for a 16 bit YCbCr format, and 27 MHz for 8 bit
CCIR 656 format. The encoder will accept pixel data down to 64x64 pixels/frame. The data can be in either 4:2:0 or
4:2:2 format.
Maximum Picture Resolution
The encoder can support various picture widths, for example 720, 704, 608, 544, 352 etc. The encoder retrieves
the rst n number of pixels from each active input picture line, where n is specied by the user in Host Register
X’14’. The encoder will ignore the number of video lines specied by the user in Host Register X’1B’ and
subsequently processes the number of video lines specied by the user in Host Register X’15’.
4:2:2 to 4:2:0 Chroma Conversion Operation
Input video data can be in either the 4:2:2 or 4:2:0 format. The encoded output format must be 4:2:0. Valid
combinations of these formats in and out of the encoder are shown in the Table entitled: “Input/Output Formats,” on
page 12. When the video source format is 4:2:2, a conversion from 4:2:2 to 4:2:0 will need to be done. The encoder
can internally perform the 4:2:2 to 4:2:0 conversion.
The encoder supports four chroma conversion modes. Host Register X’04’ bits 4-3 are used to select the chroma
conversion mode. The choices are:
frame convert, eld convert, drop eld and output convert. An on-chip 2 tap
lter is used in each conversion mode. The contents of Host Register X’04’ bits 4-3 remain effective until changed
by the user. This register may be changed on any input picture boundary, during input picture gaps. The encoder
allows this parameter to be dynamically changed while encoding is in progress. If a change to this parameter is
S420 VBV Size/Prole/Level
Host Register
Parameter
Settings
MPEG-1
MPEG-2 /
≤SIF
MPEG-2 / >SIF /
≤15 Mbps
MPEG-2 / >SIF /
>15 Mbps
SP / <11-b DC
INVALID
475,136
1,835,008
9,437,184
SP / 11-b DC
INVALID
9,437,184
MP / <11-b DC
327,680
475,136
1,835,008
9,437,184
MP / 11-b DC
INVALID
9,437,184
422P / <11-b DC
INVALID
422P / 11-b DC
INVALID
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| IBM39MPEGS422PBA17C | 制造商:IBM 功能描述: 制造商:IBM 功能描述:Video/TV Circuit, Video PROCESSING/ENDEC FOR MPEG, 352 Pin, Plastic, BGA |
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