![]() If it's for a single prototype, just use the biggest FPGA you can afford. Nail down the exact positions of all logic gates within each block. Combinational Logic Fucntions Gates are combined to create complex circuits Multiplexer example If S 0, Z A. 8 per LUT C0-7 S0-7 s6lor ctno CB0-7 Cout D2-0 D3 FF CB 4 Clock Set/Reset Sout 0 1 CB 3 0. I suggest you choose your vendor, port enough of your design to get an idea of how big a FPGA you need and choose a FPGA with an upgrade path (if you want to market). I understand the pros and cons of ASIC vs. Basic FPGA Operation Write Configuration Memory Defines system function. The same design on two different foundries should have similar system gates number, as waste is not really an issue for ASIC. FPGA must be able to freely reconfigure its cells, and you want all the flexibility you can get. Traditional logic gates can do only one job for which it was built. The LUT can implement any function of its inputs, and it's reloadable. The Virtex UltraScale+ VU19P FPGA enables prototyping and emulation of the most advanced ASIC and SoC technologies, as well as the development of complex algorithms. System gates is a common measure of ASIC design complexity. 525 2 6 13 Add a comment 2 Answers Sorted by: 3 It's about the balance between functionality and costs. Virtex UltraScale+ VU19P FPGAHighest capacity FPGA now in production by AMD. Comparison of Proposed ROM-less DDFS with other ASIC implementation Ref. Same with fast-carry logic, I don't know if they count that in equivalent gate number, but be advised that number is inflated. This LUT can be used in a whole variety of ways for implementing anywhere from a one input one output. The MUX allows selection of either the LUT output or the. ![]() A Xilinx FPGA should fit 1.5 times the logic of an Altera FPGA, since it's LUT have 6 instead of 4, right? Well, it largely depends on the design, if the design can't use 6-inputs much, the unused ones are wasted. Be aware - the cell in the FPGA is a 6-input 2-output LUT. Modern FPGAs have more than 1 million equivalent logic gates. They are aggregated in logic blocks which has other features like fast-carry chain, registers and distributed memory.Ĭonverting to system gates is useful, but don't forget it's also a marketing war. the actual synthesis different basic elements: the ASIC synthesis is oriented to optimize logic gates, while FPGA synthesis optimizes LUTs. In their most recent architecture, Xilinx use 6-input LUT and altera 4-input LUT. Xilinx use LUT, Altera LE, microsemi/lattice possibly something else. LUT, Logic Cell and Logic Element are all the same to me: the most basic FPGA general logic primitive. ![]()
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