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TC1784
Fast Analog to Digital Converter (FADC)
User´s Manual
24-15
V1.1, 2011-05
FADC, V2.21
24.2.7
Data Reduction Unit
A Data Reduction Unit is implemented in the FADC that operates as anti-aliasing filter.
This unit allows the number of conversion data requests that are issued to the CPU or
other bus masters to be reduced by adding multiple conversion results according to a
certain algorithm and presenting it to the CPU or other bus masters with a reduced
conversion request rate.
Figure 24-7 TC1784 FADC Filter Blocks
The Data Reduction Unit contains four filter blocks. Each filter block allows selection of
its input data source. The input data sources are the conversion result registers of the
four A/D converter channels.
Filter blocks can also be concatenated (block 0 and block 1 can be concatenated, same
for block 2 and block 3). When the result of a filter operation is stored in one of the final
result registers, a service request can be generated. Each filter block basically contains
adder logic and intermediate storage registers that allow support for typical digital filter
operations such as moving average calculations with intermediate results.
MCB06435_m4
RCH0
Conversion Result
Registers
RCH1
Filter
Block
1
Filter
Block
0
FRR0
FRR1
Final Result
Registers
0
RCH2
RCH3
Filter
Block
3
Filter
Block
2
FRR2
FRR3
0
Содержание TC1784
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