(If you must know: it's because the number of It is also not synthesizable for reasons to be

// This description is correct but unnecessarily complicated and so We expect synthesis prog to DTRT here.Įndmodule // : Example : Unnecessarily Complicated Behavioral Shifter Description the synthesis program to do a good job with the logical right shift // This description is good for an ordinary shifter.

: Example : Simple Behavioral Shifter Description includes the time it takes engineers to read HDL descriptions // Coding style is important because the cost of designing a system coding style is taken into account some are better than others. / Logical Right Shifter Implementations // Appearing below are several different ways of writing a logical // Use lg(w) multiplexors, each with two w-bit inputs. // // Efficient Method, The Logarithmic Shifter Cost is about 3w² before optimization. // Use a multiplexor with w inputs, each of w bits. / How to Implement a Shifter in Hardware // // // Brute Force Method (Usually not a good idea) shifter and the hardware that's synthesized? // What is the relationship between the Verilog description of the // How can we describe the shifter in Verilog? / Things to Review and Think About // // What should the hardware look like? / Terminology // // w - Number of bits in din and dout. // // : Example : Behavior of right shift. Zeros are placed in vacated positions. The value at dout is set to the value at din right-shifted by amt bits. / Logical Right Shifter // // / Logical Right Shifter Informal Description // // This should be something everyone has seen before. Includes material on logic design and elementary Verilog. / :BV3: Brown & Vranesic, Fundamentals of Digital Logic with Verilog, 3rd Ed. The primary Verilog reference for this course. / References // // / Web page with references for this class: // // / :SV12: SystemVerilog - IEEE Std 1800-2012 // // // The current Verilog language standard. Exposure to some SystemVerilog features. / Goal // // Refresh your memory of Verilog, Verilog simulation, and synthesis. / This Note/Demo Set // / Prerequisite // // Some familiarity with Verilog.

Verilog bit count