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APEX20KC Datasheet(PDF) 16 Page - Altera Corporation |
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APEX20KC Datasheet(HTML) 16 Page - Altera Corporation |
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16 / 90 page  16 Altera Corporation APEX 20KC Programmable Logic Device Data Sheet LE Operating Modes The APEX 20KC LE can operate in one of the following three modes: ■ Normal mode ■ Arithmetic mode ■ Counter mode Each mode uses LE resources differently. In each mode, seven available inputs to the LE—the four data inputs from the LAB local interconnect, the feedback from the programmable register, and the carry-in and cascade-in from the previous LE—are directed to different destinations to implement the desired logic function. LAB-wide signals provide clock, asynchronous clear, asynchronous preset, asynchronous load, synchronous clear, synchronous load, and clock enable control for the register. These LAB-wide signals are available in all LE modes. The Quartus II software, in conjunction with parameterized functions such as LPM and DesignWare functions, automatically chooses the appropriate mode for common functions such as counters, adders, and multipliers. If required, the designer can also create special-purpose functions that specify which LE operating mode to use for optimal performance. Figure 8 shows the LE operating modes. |
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