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Books/HDLBits/Verilog.md
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## Basics
### Wire
Wire is directional.
Wire is directional. We often use `assign lhs = rhs` drive the right signal to left. This assignment is a **continuous**(the change of right will conducted to left immediately when the voltage change), it's not a one-time assignment.
The port(input and output) on a module also have a direction.