3 ordspråk av Eric Lyness

Eric Lyness

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Say the FPGA chip counted 180 steps between encoder increments. Dividing 180 by four yields 45, so between the next two decoder valve changes, we waited 45 cycles and incremented a 2-bit count, waited another 45 cycles and incremented the count again, and so on. We reset the 2-bit counter and performed the division again after each encoder increment to keep the piston synchronized with any change in the valve's speed.

The calculations took place so quickly that we never saw any change in synchronization as the valve motor accelerated or decelerated.

Here's an example of a simple trap I fell into. I set up a 512-element array of sine-wave values. When the FPGA code didn't finish compiling after several hours I discovered I shouldn't design an FPGA-based application that contains an array with more than 32 elements.

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