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LF3320QC15 Datasheet(PDF) 1 Page - LOGIC Devices Incorporated |
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LF3320QC15 Datasheet(HTML) 1 Page - LOGIC Devices Incorporated |
1 / 24 page DEVICES INCORPORATED Video Imaging Products 2-1 LF3320 Horizontal Digital Image Filter 08/16/2000–LDS.3320-N FEATURES DESCRIPTION The LF3320 filters digital images in the horizontal dimension at real-time video rates. The input and coefficient data are both 12 bits and in two’s complement format. The output is also in two’s complement format and may be rounded to 16 bits. The LF3320 is designed to take advantage of symmetric coefficient sets. When symmetric coefficient sets are used, the device can be configured as a single 32-tap FIR filter or as two separate 16-tap FIR filters. When asymmetric coefficient sets are used, the device can be configured as a single 16-tap FIR filter or as two separate 8-tap FIR filters. Multiple LF3320s can be cascaded to create larger filters. Interleave/Decimation Registers (I/D Registers) allow interleaved data to be fed directly into the device and filtered without separating the data into individual data streams. The LF3320 can handle a maximum of sixteen data sets interleaved together. The I/D Registers and on-chip accu- mulators facilitate using decimation to increase the number of filter taps. Decimation of up to 16:1 is supported. The LF3320 contains enough on-board memory to store 256 coefficient sets. Two separate LF InterfacesTM allow all 256 coefficient sets to be updated within vertical blanking. LF3320 Horizontal Digital Image Filter DEVICES INCORPORATED LF3320 BLOCK DIAGRAM ❑ ❑ ❑ ❑ ❑ 83 MHz Data Rate ❑ ❑ ❑ ❑ ❑ 12-bit Data or Coefficients (Expand- able to 24-bit) ❑ ❑ ❑ ❑ ❑ 32-Tap FIR Filter, Cascadable for More Filter Taps ❑ ❑ ❑ ❑ ❑ Over 49 K-bits of on-board Memory ❑ ❑ ❑ ❑ ❑ LF InterfaceTM Allows All 256 Coefficient Sets to be Updated Within Vertical Blanking ❑ ❑ ❑ ❑ ❑ Various Operating Modes: Dual Filter, Single Filter, Double Wide Data or Coefficient, Matrix Multipli- cation, and Accumulator Access. ❑ ❑ ❑ ❑ ❑ Selectable 16-bit Data Output with User-DefinedRoundingandLimiting ❑ ❑ ❑ ❑ ❑ Supports Interleaved Data Streams ❑ ❑ ❑ ❑ ❑ Supports Decimation up to 16:1 for Increasing Number of Filter Taps ❑ ❑ ❑ ❑ ❑ 3.3 Volt Supply ❑ ❑ ❑ ❑ ❑ 144 Lead PQFP 256 COEFFICIENT SET STORAGE 16-TAP FILTER A 16-TAP FILTER B DIN11-0 12 256 COEFFICIENT SET STORAGE ROUT11-0 12 12 12 ROUND SELECT LIMIT CIRCUITRY OED CAA7-0 CENA 8 CAB7-0 CENB 8 COUT11-0 RIN11-0 DOUT15-0 CFA11-0 12 LDA CFB11-0 LDB 16 INTERLEAVE / DECIMATION REGISTERS 12 CLK PAUSEA PAUSEB |
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