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參數(shù)資料
| 型號： | DMA2275 |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分類： | 消費家電 |
| 英文描述： | DMA 2275, DMA 2286 C/D/D2-MAC Descrambler |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數(shù)： | 5/48頁 |
| 文件大小： | 217K |
| 代理商： | DMA2275 |
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DMA 2275, DMA 2286
5
2. Chip Architecture
Figure 2–1 shows the architecture of the descrambling
chip DMA 2286. The DMA 2275 architecture is identical
to the that of the DMA 2286, except that the sound pro-
cessor is missing. The chips can be subdivided into sev-
eral functional blocks.
DMA 2275 and DMA 2286:
Video Processor
– descrambling, panning and interpolation of the video
signal
PRBS Generator
– delivers cut points and cipher streams
Line 625 Processor
– acquisition of service identification data and real time
control information
Packet Processor
– acquisition of entitlement packets, acquisition of gen-
eral purpose packets, selection of cipher stream, des-
crambling of data packets
Interface Processor
– management of internal and external data transfer
Timing Generator
– delivers internal chip timing
DMA 2286 only:
Sound Processor
– spectrum descrambling of data burst, packet deinter-
leaving (one subframe only), sound packet processing
(one subframe only)
Line 625 Proc.
3
Vdd
Vdd
GND
GND
Fig. 2–1:
Block diagram of the DMA 2286
PRBS Generator
Video Processor
Interface Processor
Timing
Generator
Sound
Proc.
Packet Processor
Code
Converter
Video
Descrambler
Interpolation
Filter
Clamping +
Video Gate
Video
PRBS
Generator
Packet
PRBS
Generator
Fast
Processor
IM Bus
Interface
DRAM
Interface
Timing
Generator
Packet
Acquisition
Line 625
Acquisition
Packet
Descrambler
Spectr. Descr.
Deinterleaver
Sound
Processing
Baseband
A
R
C
R
D
I
B
R
Φ
M
B
S
D
S
A
C
8
8
8
8
Burst
12
2
Packet
Descrambl.
Data
Corrected
Packet
VBI
Data
Baseband
8
8
8
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