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EP2C35A15F324C6N Datasheet(PDF) 16 Page - Altera Corporation |
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EP2C35A15F324C6N Datasheet(HTML) 16 Page - Altera Corporation |
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16 / 168 page  2–4 Altera Corporation Cyclone II Device Handbook, Volume 1 February 2007 Logic Elements Another special packing mode allows the register output to feed back into the LUT of the same LE so that the register is packed with its own fan-out LUT, providing another mechanism for improved fitting. The LE can also drive out registered and unregistered versions of the LUT output. In addition to the three general routing outputs, the LEs within an LAB have register chain outputs. Register chain outputs allow registers within the same LAB to cascade together. The register chain output allows an LAB to use LUTs for a single combinational function and the registers to be used for an unrelated shift register implementation. These resources speed up connections between LABs while saving local interconnect resources. See “MultiTrack Interconnect” on page 2–10 for more information on register chain connections. LE Operating Modes The Cyclone II LE operates in one of the following modes: ■ Normal mode ■ Arithmetic mode Each mode uses LE resources differently. In each mode, six available inputs to the LE—the four data inputs from the LAB local interconnect, the LAB carry-in from the previous carry-chain LAB, and the register chain connection—are directed to different destinations to implement the desired logic function. LAB-wide signals provide clock, asynchronous clear, 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 library of parameterized modules (LPM) functions, automatically chooses the appropriate mode for common functions such as counters, adders, subtractors, and arithmetic functions. If required, you can also create special-purpose functions that specify which LE operating mode to use for optimal performance. Normal Mode The normal mode is suitable for general logic applications and combinational functions. In normal mode, four data inputs from the LAB local interconnect are inputs to a four-input LUT (see Figure 2–3). The Quartus II Compiler automatically selects the carry-in or the data3 signal as one of the inputs to the LUT. LEs in normal mode support packed registers and register feedback. |
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