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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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APEX20KC датащи(PDF) 10 Page - Altera Corporation |
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APEX20KC датащи(HTML) 10 Page - Altera Corporation |
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10 / 90 page  10 Altera Corporation APEX 20KC Programmable Logic Device Data Sheet Figure 3. LAB Structure Each LAB contains dedicated logic for driving control signals to its LEs and ESBs. The control signals include clock, clock enable, asynchronous clear, asynchronous preset, asynchronous load, synchronous clear, and synchronous load signals. A maximum of six control signals can be used at a time. Although synchronous load and clear signals are generally used when implementing counters, they can also be used with other functions. Each LAB can use two clocks and two clock enable signals. Each LAB’s clock and clock enable signals are linked (e.g., any LE in a particular LAB using CLK1 will also use CLKENA1). LEs with the same clock but different clock enable signals either use both clock signals in one LAB or are placed into separate LABs. If both the rising and falling edges of a clock are used in a LAB, both LAB- wide clock signals are used. To/From Adjacent LAB, ESB, or IOEs To/From Adjacent LAB, ESB, or IOEs The 10 LEs in the LAB are driven by two local interconnect areas. These LEs can drive two local interconnect areas. Local Interconnect LEs drive local, MegaLAB, row, and column interconnects. Column Interconnect Row Interconnect MegaLAB Interconnect |
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