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Alec Aivazis edited figures/lab_5-1/caption.tex
about 9 years ago
Commit id: 74940cdc7e157605764a16fd8492a8b4f7246bad
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\label{fig:control}
This diagram shows the part of the circuit that is responsible for the logic driving the counter. The core of the controller is the finite state machine labeled \textit{stop} in the diagram. The state machine is responsible for causing the counter to begin counting from its current value as well as stopping the count. As shown in figure \ref{fig:fsm}, when the button goes high, the state machine switches between \textit{start} and \textit{stop}. In order to trigger the transition, the built in keys on the FPGA were hooked up a positive edge trigger which sent a short pulse to the state machine causing only a single transition \footnote{If the pulse is too long then it will still be high when the transition occurs causing another one.}. Since the keys on the FPGA are attached to built in debouncers, I did not have to bring one in from previous projects.
