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LF2272 Arkusz danych(PDF) 2 Page - LOGIC Devices Incorporated |
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LF2272 Arkusz danych(HTML) 2 Page - LOGIC Devices Incorporated |
2 / 9 page DEVICES INCORPORATED LF2272 Colorspace Converter/ Corrector (3 x 12-bits) Video Imaging Products 08/16/2000–LDS.2272-I 2 SYSTEMS SMALLER THAN 12-BITS Using a data path less than 12-bits requires the input data to be right justified and sign extended to 12-bits because the LF2272 carries out all calculations to full precision. Since all least-significant bits are used, the desired X, Y, and Z outputs are rounded correctly and upper-order output bits are used for overflow. products will be output five clock cycles after the input data has been registered. New output data is subsequently available every clock cycle thereafter. DATA FORMATTING The data input ports (A, B, C) and data output ports (X, Y, Z) are 12-bit integer two’s complement format. The coefficient input ports (KA, KB, KC) are 10-bit fractional two’s complement format. Refer to Figures 1a and 1b. BIT WEIGHTING The internal sum of products of the LF2272 can grow to 23 bits. However, in order to keep the output format identical to the input format, the X, Y, and Z outputs are rounded to 12-bit integer words. The rounding is done only at the final output stage to allow accuracy, with correct rounding and overflow, for applications requiring less than 12-bit integer words. The user may adjust the bit weighting by applying an identical scaling correc- tion factor to both the input and output data streams. X(n+4) = A(n)KA1(n) + B(n)KB1(n) + C(n)KC1(n) Y(n+4) = A(n)KA2(n) + B(n)KB2(n) + C(n)KC2(n) Z(n+4) = A(n)KA3(n) + B(n)KB3(n) + C(n)KC3(n) TABLE 1. LATENCY EQUATIONS FIGURE 1A.INPUT FORMATS Data Input Coefficient Input 98 7 4 3 2 65 10 –2 0 2–1 2–2 2 –5 2–6 2–7 2 –3 2–4 2 –8 2–9 (Sign) 11 10 9 6 5 4 87 3210 –2 11 210 29 2 6 2 5 2 4 2 8 2 7 2 3 2 2 2 1 2 0 (Sign) Internal Sum 20 19 18 3 2 1 17 0 –2 11 210 29 2 –6 2–7 2–8 2 8 2 –9 (Sign) DATA OVERFLOW Because the LF2272’s matched input and output data formats accommo- date unity gain (0 dB), input condi- tions that could lead to numeric overflow may exist. To ensure that no overflow conditions occur, the user must be aware of the maximum input data and coefficient word sizes allowable for each specific algorithm being performed. FIGURE 1B.OUTPUT FORMAT Result 11 10 9 6 5 4 87 3210 –2 11 210 29 2 6 2 5 2 4 2 8 2 7 2 3 2 2 2 1 2 0 (Sign) |
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