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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ISPMACH4ACPLDFAMILY датащи(PDF) 12 Page - Lattice Semiconductor |
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ISPMACH4ACPLDFAMILY датащи(HTML) 12 Page - Lattice Semiconductor |
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12 / 62 page  12 ispMACH 4A Family Note: 1. Polarity of CLK/LE can be programmed Although the macrocell shows only one input to the register, the XOR gate in the logic allocator allows the D-, T-type register to emulate J-K, and S-R behavior. In this case, the available product terms are divided between J and K (or S and R). When configured as J-K, S-R, or T-type, the extra product term must be used on the XOR gate input for flip-flop emulation. In any register type, the polarity of the inputs can be programmed. The clock input to the flip-flop can select any of the four PAL block clocks in synchronous mode, with the additional choice of either polarity of an individual product term clock in the asynchronous mode. The initialization circuit depends on the mode. In synchronous mode (Figure 7), asynchronous reset and preset are provided, each driven by a product term common to the entire PAL block. Table 8. Register/Latch Operation Configuration Input(s) CLK/LE 1 Q+ D-type Register D=X D=0 D=1 0,1, ↓ (↑) ↑ (↓) ↑ (↓) Q 0 1 T-type Register T=X T=0 T=1 0, 1, ↓ (↑) ↑ (↓) ↑ (↓) Q Q Q D-type Latch D=X D=0 D=1 1(0) 0(1) 0(1) Q 0 1 Power-Up Reset AP D/T/L AR Q PAL-Block Initialization Product Terms a. Power-up reset Power-Up Preset AP D/L PAL-Block Initialization Product Terms AR Q 17466G-012 17466G-013 Figure 7. Synchronous Mode Initialization Configurations b. Power-up preset |
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