參數(shù)資料
型號(hào)： DMA2286
廠商： MICRONAS SEMICONDUCTOR HOLDING AG
元件分類： 消費(fèi)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(yè)數(shù)： 12/48頁(yè)
文件大?。?/td> 217K
代理商： DMA2286
DMA 2275, DMA 2286
12
8. Interface Processor
The interface processor consists of:
– Fast Processor
– IM Bus Interface
– DRAM Interface
8.1. Fast Processor
The fast processor (FP) is a RISC–type 12 bit microcon-
troller built in CMOS technology. The maximum clock
frequency of 40 MHz and the internal architecture that
allows parallel ALU operation and data transfer to or
from internal RAM, make it applicable for very high
speed tasks, such as control and parameter calculation
in digital signal processors.
The FP is embedded in the DMA 2275 or DMA 2286 with
256 x 12 bit RAM and 2K x 20 bit ROM and runs with
20.25 MHz. The FP performs the following tasks:
– data transfer to and from DRAM interface
– data transfer to and from IM Bus interfaces
– support of packet acquisition
– support of line 625 acquisition
– initialization of PRBS generators
– control of video descrambler
– control of interpolation filter
Fig. 8–1 shows roughly when the different FP tasks are
executed within a frame period.
In normal operation the FP will not be directly accessed
from outside, that means that the CCU software will not
see another processor on the descrambling chip but
only a set of registers and buffers which are located ei-
ther in the acquisition DRAM or in the FP internal
memory. The CCU can access both memories via IM
Bus.
Changing any register in the DRAM memory by CCU
software will not effect the descrambler hardware im-
mediately. The FP will read or update the DRAM
memory only on frame boundaries, i.e. from line 622 to
line 7 inclusive. Changing registers in the FP memory by
CCU software will effect the descrambler hardware im-
mediately.
line_sync
prbs2
manager
line_625_store
line_sync
prbs2
manager
vcw_update
pab_update
line_sync
prbs2
manager
dcw1_update
dcw2_update
line_sync
prbs2
manager
dcw3_update
dcw4_update
line_sync
prbs2
manager
cw_conversion
line_sync
prbs2
manager
psc_update
line_sync
prbs2
manager
prbs_init
prbs2_init
enable_imbus
enable_packet_sync
line_sync
prbs2
packet acquisition
imbus
packet_sync
packet_read
pae_comparator
buffer_manager
packet_link
packet_store
packet_error
line_sync
prbs2
manager
pae_low_update
disable_imbus
disable_packet_sync
line_sync
prbs2
manager
pae_high_update
line_sync
prbs2
manager
mode_update
coeff_update
line_
sync
line_625_sync
Fig. 8–1:
Task manager
Line
1
2
3
4
5
6
7
8
622
623
624
625
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