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EPF10K20TC144-4 Datasheet(PDF) 10 Page - Altera Corporation |
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EPF10K20TC144-4 Datasheet(HTML) 10 Page - Altera Corporation |
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10 / 128 page  10 Altera Corporation FLEX 10K Embedded Programmable Logic Device Family Data Sheet Logic functions are implemented by programming the EAB with a read- only pattern during configuration, creating a large LUT. With LUTs, combinatorial functions are implemented by looking up the results, rather than by computing them. This implementation of combinatorial functions can be faster than using algorithms implemented in general logic, a performance advantage that is further enhanced by the fast access times of EABs. The large capacity of EABs enables designers to implement complex functions in one logic level without the routing delays associated with linked LEs or field-programmable gate array (FPGA) RAM blocks. For example, a single EAB can implement a 4 × 4 multiplier with eight inputs and eight outputs. Parameterized functions such as LPM functions can automatically take advantage of the EAB. The EAB provides advantages over FPGAs, which implement on-board RAM as arrays of small, distributed RAM blocks. These FPGA RAM blocks contain delays that are less predictable as the size of the RAM increases. In addition, FPGA RAM blocks are prone to routing problems because small blocks of RAM must be connected together to make larger blocks. In contrast, EABs can be used to implement large, dedicated blocks of RAM that eliminate these timing and routing concerns. EABs can be used to implement synchronous RAM, which is easier to use than asynchronous RAM. A circuit using asynchronous RAM must generate the RAM write enable (WE) signal, while ensuring that its data and address signals meet setup and hold time specifications relative to the WE signal. In contrast, the EAB’s synchronous RAM generates its own WE signal and is self-timed with respect to the global clock. A circuit using the EAB’s self-timed RAM need only meet the setup and hold time specifications of the global clock. When used as RAM, each EAB can be configured in any of the following sizes: 256 × 8, 512 × 4, 1,024 × 2, or 2,048 × 1. See Figure 2. Figure 2. EAB Memory Configurations 256 × 8 512 × 4 1,024 × 2 2,048 × 1 |
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