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LF43881 Folha de dados(PDF) 5 Page - LOGIC Devices Incorporated |
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LF43881 Folha de dados(HTML) 5 Page - LOGIC Devices Incorporated |
5 / 11 page DEVICES INCORPORATED LF43881 8 x 8-bit Digital Filter Video Imaging Products 08/16/2000–LDS.43881-J 5 Controls TCS — Data Format Control The TCS input determines the inter- pretation of the input data. When TCS is HIGH, two’s complement arithmetic is used. When TCS is LOW, unsigned arithmetic is used. TCCI — Coefficient Input Format Control The TCCI input determines the interpretation of the coefficients. When TCCI is HIGH, two’s comple- ment arithmetic is used. When TCCI is LOW, unsigned arithmetic is used. TCCO — Coefficient Output Format The TCCO output shows the format of the COUT7-0 coefficient output. TCCO follows the TCCI input. When cascading multiple LF43881s, the TCCO output of one device should be connected to the TCCI input of another device. The COENB signal enables TCCO. DIENB — Data Input Enable The DIENB input enables the X register of every filter cell. While DIENB is LOW, the X registers are loaded with the data present at the DIN7-0 inputs on the rising edge of CLK. While DIENB is HIGH, all bits of DIN7-0 are forced to zero and a rising edge of CLK will load the X register of every filter cell with all zeros. DIENB must be low one clock cycle prior to presenting the input data on the DIN7-0 input since it is latched and delayed internally. CIENB — Coefficient Input Enable The CIENB input enables the C and D registers of every filter cell. While CIENB is LOW, the C and appropriate D registers are loaded with the coefficient data on the rising edge of CLK. While CIENB is HIGH, the contents of the C and D registers are held and the CLK signal is ignored. By using CIENB in its active state, coefficient data can be shifted from cell to cell. CIENB must be low one clock cycle prior to presenting the coefficient data on the CIN7-0 input since it is latched and delayed inter- nally. COENB — Coefficient Output Enable The COENB input enables the COUT7-0 and TCCO outputs. When COENB is LOW, the outputs are enabled. When COENB is HIGH, the outputs are placed in a high-imped- ance state. DCM1-0 — Decimation Control The DCM1-0 inputs select the num- ber of decimation registers to use (Table 1). Coefficients are passed from one cell to another at a rate determined by DCM1-0. When no decimation registers are selected, the coefficients are passed from cell to cell on every rising edge of CLK (no decimation). When one decima- tion register is selected, the coeffi- cients are passed from cell to cell on every other rising edge of CLK (2:1 decimation). When two decimation registers are selected, the coeffi- cients are passed from cell to cell on every third rising edge of CLK (3:1 decimation) and so on. DCM1-0 is latched and delayed internally. ADR2-0 — Cell Accumulator Select The ADR2-0 inputs select which cell’s accumulator will available at the SUM25-0 output or added to the output stage accumulator. In both cases, ADR2-0 is latched and delayed by one clock cycle. If the same address remains on the ADR2-0 inputs for more than one clock cycle, SUM25-0 will not change if the con- tents of the accumulator changes. Only the result from the first selection of the cell (first clock cycle) by ADR2-0 will be available. ADR2-0 is also used to select which accumulator to clear when ERASE is LOW. SENBH — MSB Output Enable When SENBH is LOW, SUM25-16 is enabled. When SENBH is HIGH, SUM25-16 is placed in a high-imped- ance state. SENBL — LSB Output Enable When SENBL is LOW, SUM15-0 is enabled. When SENBL is HIGH, SUM15-0 is placed in a high-imped- ance state. RESET — Register Reset Control When RESET is LOW, all registers are cleared simultaneously except the cell accumulators. RESET can be used with ERASE to clear all cell accumula- tors. RESET is latched and delayed internally. Refer to Table 2. ERASE — Accumulator Erase Control When ERASE is LOW, the cell accu- mulator specified by ADR2-0 is cleared. When RESET is LOW in conjunction with ERASE, all cell accumulators are cleared. Refer to Table 2. |
Nº de peça semelhante - LF43881 |
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Descrição semelhante - LF43881 |
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