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LF43881JC40 Datenblatt(PDF) 1 Page - LOGIC Devices Incorporated |
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LF43881JC40 Datenblatt(HTML) 1 Page - LOGIC Devices Incorporated |
1 / 11 page DEVICES INCORPORATED LF43881 8 x 8-bit Digital Filter Video Imaging Products 08/16/2000–LDS.43881-J 1 u u u u u 25 MHz Maximum Sampling Rate u u u u u 320 MHz Multiply-Accumulate Rate u u u u u 8 Filter Cells u u u u u 8-bit Unsigned or Two’s Complement Data u u u u u 8-bit Unsigned or Two’s Complement Coefficients u u u u u 26-bit Data Outputs u u u u u Shift-and-Add Output Stage for Combining Filter Outputs u u u u u Expandable Data Size, Coefficient Size, and Filter Length u u u u u User-Selectable 2:1, 3:1, or 4:1 Decimation u u u u u Replaces Harris HSP43881 u u u u u 84-pin PLCC, J-Lead FEATURES DESCRIPTION LF43881 8 x 8-bit Digital Filter DEVICES INCORPORATED The LF43881 is a video-speed digital filter that contains eight filter cells (taps) cascaded internally and a shift- and-add output stage. An 8 x 8 multiplier, three decimation registers, and a 26-bit accumulator are con- tained in each filter cell. The output stage of the LF43881 contains a 26-bit accumulator which can add the contents of any filter stage to the output stage accumulator shifted right by 8 bits. 8-bit unsigned or two’s complement format for data and coefficients can be independently selected. Expanded coefficients and word sizes can be processed by cascading mul- tiple LF43881s to implement larger filter lengths without affecting the sample rate. By reducing the sample rate, a single LF43881 can process larger filter lengths by using multiple passes. The sampling rate can range from 0 to 40 MHz. Over 1000 taps may be processed without overflows due to the architecture of the device. The output sample rate can be re- duced to one-half, one-third, or one- fourth the input sample rate by using the three decimation registers con- tained in every filter cell. Matrix multiplication, N x N spatial correla- tions/convolutions, and other 2-D operations for image processing can also be achieved using these registers. LF43881 BLOCK DIAGRAM FILTER CELL 0 FILTER CELL 1 8 FILTER CELL 2 8 8 FILTER CELL 3 8 FILTER CELL 4 8 FILTER CELL 5 8 FILTER CELL 6 8 FILTER CELL 7 8 26 26 26 26 26 26 26 26 8 MUX 5 DIN7-0 TCS DIENB, CIENB, ERASE, DCM1-0 TCCI CIN7-0 ADR2-0 3 OUTPUT STAGE 26 26 SHADD SENBL SENBH SUM25-0 8 TCCO COUT7-0 COENB TO ALL REGISTERS CLK TO ALL CELLS RESET |
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