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Altera_Forum
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9 years ago

SignalTap II fails to acquire events

Hello, I'm using SignalTap II to debug and verify my Cyclone V SOC design. On the signal list there's an enumerated type VHDL FSM with 10 states. The FSM moves consecutively from one state ...
Altera_Forum's avatar
Altera_Forum
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9 years ago

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Doesn't the "others" statement make the FSM safe ?

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It does not because it's only considered in synthesis if it covers a defined state. Safe encoding adds a reset to initial state for any illegal (undefined) state.

As sstrell mentioned, enforcing a full case binary encoding would be the other option. But it blocks synthesis from optimizing the state machine logic.