Applied Formal Verification by Douglas L. Perry, Harry Foster

By Douglas L. Perry, Harry Foster

Formal verification is a strong new electronic layout approach. during this state of the art educational, of the field's most sensible identified authors staff as much as convey designers how one can successfully follow Formal Verification, besides description languages like Verilog and VHDL, to extra successfully remedy real-world layout difficulties.

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While FPGA-based processors might run at 100 to 150 MHz, processorbased accelerators might run at 800 MHz to 1 GHz or more. Compile times are relatively fast even for very large designs. 8 ASIC Processor-Based Accelerator ASIC1 ASIC2 ASIC3 ASIC4 ASIC5 ASIC6 ASIC7 ASIC8 ASIC9 accelerators execute much faster than other hardware accelerators, typically reaching speeds of 100,000 to 500,000 clocks per second. This speed allows tests that took hours to run on an HDL software simulator to run in seconds.

These approaches use some custom-built Current Verification Techniques 23 hardware to increase simulation speed. A typical simulation is a set of interconnected processes that trigger one another based on external or internal events. Internal events are usually caused by state machines or clocks. External events are caused by testbenches or other models connected to the design. Events cause processes to be executed to recalculate their output states. In an RTL simulator each process is executed serially one after the other.

The first problem is partitioning the design. Because of a limited number of pins on an FPGA device, partitioning can become a big problem. Depending on where the different block boundaries occur and the size of the design, a partition cut might require hundreds or thousands of signals between two blocks. Given the fact that there are only a few hundred available pins on the entire FPGA, pins quickly become the limiting issue for partitions. Designers may have to slow the interfaces and use pin multiplexing as in emulators.

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