![]() ![]() If you can express your logic in terms of this primitive, you can estimate whether your design fits into the device. Each LUT can be used to implement an arbitrary combinatorial logic with up to 6 inputs. That should be enough to let you pick the right size device.įor example, you can see in that document that the LX45 part contains about 27,000 6-input LUTs. ![]() Then mentally map your design to those resource to see how many blocks you need. In any case, you can look at the Spartan 6 Configurable Logic Block User's Guide to see what resources are available in each block. Now that programmable logic devices with gate densities of over 100 K gates. If you want to do unclocked design in an FPGA it's possible in principle, but you're not going to get much help from the tools (or vendors) and you'll probably need to find a specialized community who do that kind of thing to get any support. Moving a design from FPGA to ASIC questions the gains and benefits which can be. The issue with this is that FPGA design tools depend on clocking and the resulting timing constraints to drive optimization of the synthesized design. You mentioned that your design is mostly unclocked. citation needed Logic blocks can be configured by the engineer to provide reconfigurable logic gates. The ability for the tools to do this optimally could well be compromised by the desire to have ‘probe points’ (i.e. It will give you room for feature creep in your design and also speeds up development because the design tools won't need to work so hard to fit your design into the available resources. In computing, a logic block or configurable logic block (CLB) is a fundamental building block of field-programmable gate array (FPGA) technology. So when an FPGA is used to emulate an ASIC it is generally just a case of implementing the ASIC design in an FPGA with as many or as few gates being placed into each LUT as possible. If you aren't tightly cost-constrained, use a device 2x or more bigger than you think you need. One or the other of those will typically be the critical resource that determines the size of part you need. Usually you can get a decent idea early on in your design process how many flip-flops, how many i/o's and how much ram your design needs. To estimate the size device you need, you'll need to look at the summary on p. Like lines of code or megahertz of processor speed, it's a highly inaccurate metric for measuring the device capability, and in the FPGA markets the customers wised up enough to suppress its use. In this work, we propose LUT-Lock, a novel Look-Up-Table-based netlist obfuscation algorithm, for protecting the intellectual property that is mapped to an. Fpr example, if you design a 4 input LUT as a 4 input gate/mux, the gate count may vary between 1 - 9. FPGA manufacturers don't use equivalent gate counts much any more, even in the hand-wavyest marketing materials. It is not easy to find the equivalent gate count of a LUT without the knowledge of the design. ![]()
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