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參數(shù)資料
| 型號： | M65727FP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | MPEG2 MOTION ESTIMATION LSI |
| 中文描述： | 大規(guī)模集成電路的MPEG2運動估計 |
| 文件頁數(shù)： | 14/55頁 |
| 文件大?。?/td> | 242K |
| 代理商： | M65727FP |
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DISTRIBUTION RESTRICTED. COPYRIGHT RESERVED 1995
CONTACT MITSUBISHI ELECTRONICS REGARDING DISTRIBUTION
14
3.3 Operational Modes
M65727 has the following operational modes which can be switched externally. This chapter
outlines the operational modes of M65727.
3.3.1 Field / Frame / Field Dual-Prime / Frame Dual-Prime
M65727 is capable of 4 modes, namely Field mode / Frame mode / Field Dual-Prime mode / Frame
Dual-Prime mode, to work with the prediction mode of MPEG2. These modes are specified as shown
below using MODE pins. They must be specified before the chip operation and fixed during operation.
00: Field mode
01: Frame mode
10: Field Dual-Prime mode
11: Frame Dual-Prime mode
Field mode detects three sets of motion vectors simultaneously which work with 16x16 block, 16x8
(upper) block, and 16x8 (lower) block.
Frame mode detects three sets of motion vectors simultaneously which work with 16x16 block, 16x8
(top) block, and 16x8 (bottom) block.
Field Dual-Prime and Frame Dual-Prime mode detect the dmv.
3.3.2 The Search Range in Horizontal Direction
The search range in the horizontal direction can be selected from ±7.5 / ±15.5 / ±31.5 /± 63.5/ and
±127.5. The number of cycles needed for the motion vector estimation increases in proportion to the
size of the horizontal search range. When ±15.5 or larger is specified as the horizontal search range, it
is expected that multiple chips with interleaving manner are used. Refer to Chapter 5.5 for the number
of chips needed when the horizontal search range is ±15.5 or more. The horizontal search range is
specified as shown below using HSIZE pins. The horizontal search range must be specified before the
chip goes into operation and should be fixed during the operation.
000: ±7.5, 001: ±15.5, 010: ±31.5, 011: ±63.5, 100: ±127.5, 101 ~ 111: Reserved
3.3.3 The Search Range in Vertical Direction
The vertical search range can be selected from ±7.5 and ±15.5. This range detects a minimum
execution cycle (550 / 806) In the vertical expansion mode, the search range will be ±8.0 / ±16.0.
See Chapter 5.5 for the number of chips needed for the vertical expansion. The vertical search range is
specified as shown below using VSIZE pin. This must be done before the chip operation and it should
be fixed during the operation.
0: ±7.5, 1: ±15.5
The vertical search range of ±7.5 can be used only under 27MHz operation.
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