所以可以發現,整個Moore FSM事實上是由2塊的組合邏輯與1塊D-FF所構成,我們常聽到所謂的一段式、二段式與三段式FSM,事實上就是由這3個block排列組合而成。 Moore FSM各種coding style比較 為了要實際比較各種coding style,在此舉一個簡單的例子,若input w_i為連續2個clk為high,則
将之前的例子用Mealy FSM重新改写,原本在Moore FSM下,若input w_i为连续2个clk为high,则output会在下1个clk产生周期为1 T的high pulse,若改用Mealy FSM,则output会提早1个clk出现,如下图所示。 原本Moore FSM需要3个state,若改用Mealy FSM后,会只剩下2个state,接下来要用各种coding style来实现Mealy FSM。
$display("Bad FSM."); // synopsys translate_on default endcase Datapath 参考:Coding Guidelines for Datapath Synthesis. 有号数的计算:若有需要关于有号数的计算,应当利用Verilog 2001所提供的signed及$signed()机制。 input signed [7:0] a, b; output signed [15:0] o; assign o = a * b; or...
讲义-Verilog Coding Style Verilog Coding Styles For RTL Synthesis
Coding techniques in Verilog HDL of finite state machines (FSMs) for synthesis in field programmable gate arrays (FPGAs) are researched, and the choice problem the best FSM coding styles in terms of an implementation cost (area) and a performance (speed) are considered. The problem is solved...
This page contains tidbits on writing FSM in verilog, difference between blocking and non blocking assignments in verilog, difference between wire and reg, metastability, cross frequency domain interfacing, all about resets, FIFO depth calculation,Typica
Finite state machine (FSM) is one of the first topics taught in any digital design course, yet coding one is not as easy as first meets the eye. There are Moore and Mealy state machines, encoded and one-hot state encoding, one or two or threealwaysblock coding styles. Recently I was ...
Download the coding example files from Coding Examples. Filename: parameter_1.v // A Verilog parameter allows to control the width of an instantitated // block describing register logic // // // File:parameter_1.v // module myreg (clk, clken, d, q); parameter SIZE = 1; input ...
本文整理出幾種常見的多工器mux可合成的coding style,並深入探討其合成的結果。 Introduction 使用環境:NC-Verilog 5.4 + Debussy 5.4 v9 + Quartus II 8.1 (同一種coding style在不同synthesizer下會有不同的認知,甚至相同synthesizer不同版本也會不同,本文僅討論Quartus II 8.1下的實驗結果)。
Please refer to tidbits section for "writing FSM in Verilog". How do I avoid Latch in Verilog ? Latches are always bad (I don't like that statement); latches are caused when all the possible cases of assignment to variable are not covered. Well this rule applies to combinational blocks...