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参数资料
| 型号： | IBM39MPEGS420PBA18C |
| 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： | 6/25页 |
| 文件大小： | 112K |
| 代理商： | IBM39MPEGS420PBA18C |
IBM39MPEGS42x
IBM39MPEGSI
MPEG S422, MPEG S420 and MPEG SI Encoders
SI Encoder Operations/Features
14 of 25
Sseries_sds_071701.fm.02
July 17, 2001
SI Encoder Operations/Features
This section, describes the encoder operations and features of the MPEGSI product. Please refer to Section 8.4
Basic Register Denitions of the MPEG-2 S-Series Encoder User Application Guide, for a detailed description of
each host register referenced.
MPEG-2 Support
The MPEG-2 standard denes several syntactic subsets at which compliant encoders and decoders may operate.
These subsets were dened to make the implementation of encoders and decoders more practical. Each subset is
dened in terms of a prole and a level. The prole designation represents the syntactic subset of the MPEG-2
standard supported by a given encoder or decoder implementation, and the level designation provides constraints
for various bitstream parameters.
The encoder conforms to the 4:2:2 Prole at Main Level (4:2:2P@ML) specications provided in the MPEG-2
standard. In addition, the following syntactic subsets of 4:2:2P@ML are supported by the encoder:
MP@ML (Main Prole at Main Level)
MP@HL (Main Prole at High Level)
SP@ML (Simple Prole at Main Level)
ISO/IEC 11172 (MPEG-1)
The user can choose the syntactic subset based upon the user-specied parameters in effect while encoding a
given sequence. For example, Host Register X’23’, bits 6 and 5, enables the user to select the output prole. Also,
the user can produce an MPEG-1 compliant bitstream by setting the user-specied parameters listed in Section
7.1.1, “Overview” of the MPEG-2 S-Series Encoder User Application Guide.
VBV Buffer Size
At chip power on and initialization, the VBV buffer size is set to a default value based on how the following
initialization parameters are set by the application:
MPEG Standard via Host Register X'00', bit 0
Prole Conguration via Host Register X'23', bits 6 and 5
Bitrate via Host Register X'01' and Host Register X'02', bits 13 to 12
DC Precision via Host Register X'28', bits 1 to 0
SIF Picture Resolution via Host Registers X'07', bits 6 and 1, X'0A', bits 11 to 0, X'15', bits 11 to 0, X'19', bit 0,
and command code X'000C' to Host Register X'3E'
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