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Modules & Nets
module input output wire reg logic parameter localparam module instantiation named port mapping generate
Combinational Logic
assign always @* always_comb blocking assignment ternary operator case casez casex caveat concatenation replication
Sequential Logic
always posedge nonblocking assignment always_ff synchronous reset asynchronous reset clock enable counter shift register edge detector register pipeline
Data & Operators
bit vector signed value part select indexed part select arithmetic operators logical operators bitwise operators reduction operators shift operators comparison operators
Procedural Control
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Finite State Machines
state parameter enum state state register next-state combinational Moore FSM Mealy FSM default state recovery one-hot state output register transition condition
Testbenches
initial block delay control clock generation $display $monitor $finish test vector loop task stimulus $readmemh assert property
Advanced RTL
interface modport struct packed union packed typedef package import generate if generate for parameterized module signed arithmetic
Verilog / Combinational Logic

blocking assignment

Learn blocking assignment in Verilog through a focused explanation, a dedicated construct-specific example, an engineering boundary, and a mastery check.

10 min read • Beginner

blocking assignment is an atomic Verilog topic inside Combinational Logic. This lesson focuses on how the blocking assignment construct is written, what it changes, and when it is the right tool.

Trace the example line by line. Identify the exact syntax for blocking assignment, 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

verilog-02-04-blocking-assignment.sv
verilog Try It Live 
always_comb begin temp = a + b; y = temp ^ mask; end
Edge case / engineering note

For blocking assignment, 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

blocking assignment Mastery Check →
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