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LF43168QC30 Fiches technique(PDF) 9 Page - LOGIC Devices Incorporated |
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LF43168QC30 Fiches technique(HTML) 9 Page - LOGIC Devices Incorporated |
9 / 16 page DEVICES INCORPORATED Video Imaging Products 9 LF43168 Dual 8-Tap FIR Filter 03/28/2000–LDS.43168-H Interleaved Coefficient Filters Figure 7 shows the filter configuration when the device is programmed for interleaved coefficients. An inter- leaved coefficient set contains two separate odd-tap, even-symmetric coefficient sets which have been interleaved together (see Figure 8). If two data sets are interleaved into the same serial data stream, they can both be filtered by different coefficient sets if the two coefficient sets are also interleaved. The LF43168 is config- ured as an interleaved coefficient filter by programming the device for interleaved coefficient sets, even- symmetric coefficients, odd number of filter taps, and data reversal disabled. Note that coefficient 3, in Figure 7, must be divided by two to get the correct result. Asymmetric Coefficient Filters It is possible to have asymmetric coefficient filters. Asymmetric coeffi- cient sets do not exhibit even or odd symmetric properties. A 4-tap asym- metric filter is possible by putting the device in even-tap, pass A mode and then feeding the asymmetric coeffi- cient set to the multipliers. An 8-tap asymmetric filter is possible if the device is clocked twice as fast as the input data rate. It will take two CLK cycles to calculate the output. On the first CLK cycle, the reverse decimation path is selected to feed data to the filter multipliers. On the second CLK cycle, the coefficients sent to the multipliers are changed (if necessary) and the forward decimation path is selected to feed data to the filter multipliers. FIGURE 8. INTERLEAVED COEFFICIENT SET EXAMPLE Interleaved Coefficient Set Consisting of Sets A and B 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 Odd-Tap, Even-Symmetric Coefficient Set B 1 2 3 4 5 Odd-Tap, Even-Symmetric Coefficient Set A 6 7 6 7 11 12 13 14 FIGURE 7. INTERLEAVED COEFFICIENT FILTER CONFIGURATION COEF 0 COEF 1 COEF 2 B + A AB B + A AB B + A AB B + A AB DATA IN ODD-TAP INTERLEAVED FILTER NNN NNN N = Delay Length (Decimation Factor) N COEF 3 2 |
Numéro de pièce similaire - LF43168QC30 |
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Description similaire - LF43168QC30 |
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