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VHDL / FSM & RTL

reset synchronous

Learn reset synchronous in VHDL through a focused explanation, a dedicated construct-specific example, an engineering boundary, and a mastery check.

10 min read • Advanced

reset synchronous is an atomic VHDL topic inside FSM & RTL. This lesson focuses on how the reset synchronous construct is written, what it changes, and when it is the right tool.

Trace the example line by line. Identify the exact syntax for reset synchronous, the input state before it runs, and the resulting value, control flow, database state, hardware behavior, or runtime effect afterward. Neighboring lessons use different constructs rather than renamed copies of this one.

Topic-specific example

vhdl-07-05-reset-synchronous.vhd
vhdl Try It Live 
process(clk) begin if rising_edge(clk) then if rst='1' then q<='0'; else q<=d; end if; end if; end process;
Edge case / engineering note

For reset synchronous, test the boundary that belongs to this exact feature rather than a generic failure case. Check invalid or empty input, NULL/unknown state, numeric limits, transaction or exception behavior, synthesis/runtime constraints, ownership/permission rules, or backtracking/control-flow effects where they apply.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

reset synchronous Mastery Check →
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Mealy output
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reset asynchronous