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Log In. Don't have an account? Sign Up. Update your profile Let us wish you a happy birthday! Add your birthday. Active 3 years, 10 months ago. Viewed 3k times. Here's a super simple example: library ieee; use ieee. Your question misses the 3 process style. Your second process has no default assignments either before the case or in an others statement. This can cause latches if the FSM is extended and you or an other person misses to assign one output. Your res is asynchronous.
The FSM had no initial state. The Free Range book is OK as a beginners guide but notoriously bad as a reference.
Paebbels I withdraw the remainder of of my earlier comment, it wasn't the Q I thought it was. I already answered to a similar question stackoverflow.
Everybody select how implement their state machines as function of size of state machine, tools that need to read the code, styles used where he works and personal preferences. There isn't a right way to code and a wrong way to code. It has been corrected. Sorry I haven't answered today, maybe tomorrow.
Finite State Machines in Hardware: Theory and Design (with VHDL and SystemVerilog). Book Abstract: Modern, complex digital systems invariably include. Jan 1, , Volnei A. Pedroni and others published Finite State Machines in Hardware: Theory and Design (with VHDL and SystemVerilog).
I always recommend one-process state machines because it avoids two classes of basic errors that are exceedingly common with beginners: Missing items in the combinational process's sensitivity list cause the simulation to misbehave. It even works in the lab since most synthesizers don't care about the sensitivity list.
Less importantly, the combinational process reduces simulation efficiency. QuantumRipple QuantumRipple 1, 11 11 silver badges 17 17 bronze badges.
Renaud Pacalet Renaud Pacalet Where is ref. The correct design of such parts is crucial for attaining proper system performance.
Curtis Aamodt Tor M. Related posts Theory. This book offers the most detailed coverage of finite state machines available. MW: Finite State Machines. Two other commercial cases are shown in figures 2. Which requires the least combinational logic? Recall that two physical signals, due to different propagation delays, will never change exactly at the same time and they are not perfect voltage steps anyway , so the value of count is expected to go through intermediate values before reaching the final value.
This book offers detailed, comprehensive coverage of the theory and design for any category of hardware-implemented finite state machines. View PDF. Save to Library. Create Alert. Share This Paper.