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| 型號(hào)： | IBM39MPEGS422PBA17C |
| 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)： | 5/25頁 |
| 文件大?。?/td> | 112K |
| 代理商： | IBM39MPEGS422PBA17C |
IBM39MPEGS42x
IBM39MPEGSI
MPEG S422, MPEG S420 and MPEG SI Encoders
Sseries_sds_071701.fm.02
July 17, 2001
S420 Encoder Operations/Features
13 of 25
Encoder Memory Requirement
The required type and speed of each external memory are dened in the following table.
*Note: For an alternative memory solution, see section entitled: “Solution for System Cost Reduction”.
Solutions to Help Lower System Expense
The MPEGS420 may be congured by the user to operate at 15 Mb/s (or less) compressed data rate and +/-64H,
+/- 56V search range. This conguration allows the use of 192KB industry standard ASRAM with 12 ns access time
in place of the previously indicated SSRAM as the Search Memory. This conguration will also lower encoder
operating power by 0.3 W.
MPEGS420 Memory Requirement
Memory
Minimum Required
Size
Type
Speed
Frame memory
5MB
SDRAM
100MHz
Reconstructed
memory
2MB
SDRAM
100MHz
Search memory *
256KB
SSRAM
8ns
Compressed data
output memory
application
dependent
FIFO
or
Field Memory
10ns
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