Verilog HDLVerilog HDL(Behavioral Modeling)(Behavioral Modeling)

Bilal Saqib

Behavioral ModelingBehavioral Modeling

Structured ProceduresStructured Procedures

Procedural BlocksProcedural Blocks

Procedural Blocks are constructed from the following components.◦Procedural Assignment Statements◦High-Level Constructs

Procedural AssignmentsProcedural Assignments

Procedural Execution ControlProcedural Execution Control

Execution of Procedural Blocks can be specified in different ways◦Simple Delays: #<delay>

Specify delay before and after execution for a number of time steps.

◦Edge-Sensitive Controls: always @ (<edge><signal>) Execution occurs only at a signal edge. Optional

keywords “posedge” or “negedge” can be used to specify signal edge for execution.

NonBlocking v Blocking NonBlocking v Blocking AssignmentsAssignments

NonBlocking v Blocking NonBlocking v Blocking AssignmentsAssignments

Conditional Statements: if elseConditional Statements: if else

Conditional Statements: caseConditional Statements: case

casex and casezcasex and casez

Looping Statements: repeat

Looping Statements: while

Looping Statements: forever

Looping Statements: for