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LF2246 Arkusz danych(PDF) 1 Page - LOGIC Devices Incorporated |
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LF2246 Arkusz danych(HTML) 1 Page - LOGIC Devices Incorporated |
1 / 7 page DEVICES INCORPORATED LF2246 11 x 10-bit Image Filter Video Imaging Products 08/16/2000–LDS.2246-K 2-11 u u u u u 66 MHz Data and Coefficient Input and Computation Rate u u u u u Four 11 x 10-bit Multipliers with Individual Data and Coefficient Inputs and a 25-bit Accumulator u u u u u User-Selectable Fractional or Integer Two’s Complement Data Formats u u u u u Fully Registered, Pipelined Archi- tecture u u u u u Input and Output Data Registers, with User-Configurable Enables u u u u u Three-State Outputs u u u u u Fully TTL Compatible u u u u u Ideally Suited for Image Processing and Filtering Applications u u u u u Replaces TRW/Raytheon/Fairchild TMC2246 u u u u u 120-pin PQFPP FEATURES DESCRIPTION LF2246 11 x 10-bit Image Filter DEVICES INCORPORATED The LF2246 consists of an array of four 11 x 10-bit registered multipliers followed by a summer and a 25-bit accumulator. All multiplier inputs are user accessible and can be up- dated every clock cycle with either fractional or integer two’s comple- ment data. The pipelined architecture has fully registered input and output ports and an asynchronous three-state output enable control to simplify the design of complex systems. The pipeline latency for all inputs is five clock cycles. Storage for mixing and filtering coefficients can be accomplished by holding the data or coefficient inputs over multiple clock cycles. A 25-bit accumulator path allows cumulative word growth which may be internally rounded to 16 bits. Output data is updated every clock cycle and may be held under user control. All inputs, outputs, and controls are registered on the rising edge of clock, except for OEN. The LF2246 operates at a clock rate of 66 MHz over the full tempera- ture and supply voltage ranges. The LF2246 is applicable for perform- ing pixel interpolation in image manipulation and filtering applica- tions. The LF2246 can perform a bilinear interpolation of an image (4- pixel kernels) at real-time video rates when used with an image resampling sequencer. Larger kernels or more complex functions can be realized by utilizing multiple devices. Unrestricted access to all data and coefficient input ports provides the LF2246 with considerable flexibility in applications such as digital filters, adaptive FIR filters, mixers, and other similar systems requiring high-speed processing. LF2246 BLOCK DIAGRAM D19–0 C110–0 ENB1 D29–0 C210–0 ENB2 10 25 MS LS OCEN ACC FSEL CLK OEN TO ALL REGISTERS S15–0 ENSEL 22 22 D39–0 C310–0 ENB3 D49–0 C410–0 ENB4 11 10 11 10 11 10 11 |
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