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關於verilog always 在 [請益] verilog如何在一個always判斷觸發源？ - 看板Electronics 的評價
關於verilog always 在 Verilog (2) – 硬體語言的基礎(作者：陳鍾誠) 的評價
關於verilog always 在 verilog - What is the difference between "," and "or" in always 的評價
關於verilog always 在 What is @ Always in Verilog? - YouTube 的評價
關於verilog always 在 Verilog always block請教- 科技業板 - Dcard 的評價
關於verilog always 在 always @(*) vs. assign - Electrical Engineering Stack Exchange 的評價
關於verilog always 在 Wildcards in sensitivity lists in VHDL and Verilog - Sigasi 的評價
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verilog always 在 [請益] verilog如何在一個always判斷觸發源？ - 看板Electronics 的推薦與評價

作者henry666666 (雨四光)

看板Electronics

標題Re: [請益] verilog如何在一個always判斷觸發源？

時間Sun Apr 5 18:40:51 2009

※ 引述《tkhan (腦殘綠吱吱)》之銘言：
: 標題: Re: [請益] verilog如何在一個always判斷觸發源？
: 時間: Fri Apr 18 00:27:29 2008
:
: ※ 引述《icetofux (豆腐)》之銘言：
: : input in0,in1;
: : reg a;
: : always@(in0)
: : begin
: : a=0;
: : end
: : always@(in1)
: : begin
: : a=1;
: : end
: : 在軟體模擬上，compile會通過，也能進行波形模擬，但是以donwload用的軟體去進行
: : compile，則會告訴不能讓兩個always敘述去變動同一個變數值。
: : 如果我想改成：
: : always@(in0 or in1)
: : begin
: : ...
: : end
: : 我要怎麼去判斷到底是in0有動作還是in1有動作而進入always敘述呢？
:
: always @(in0 or in1)
: begin
: if(in0)
: a=0;
: else if(in1)
: a=1;
: else
: a=0;
: end
: 上課要認真..
: 這是基礎中的基礎..

上課不認真的來問問題了：

//程式如下
module test(in0,in1,a);
input in0,in1;
output a;
reg a;
always @(in0 or in1)
begin
if(~in0)
a=0;
else if(~in1)
a=1;
else
a=0;
end
endmodule

我希望能做到，當in0改變的時候，執行a=0
當in1改變的時候，執行a=1

但是這樣寫……

當我按下in0的時候
進入always裡面，然後進入if判斷，a=0。
到此都沒有問題。

但我in0還沒放開(~in0還是==1)時，
我又按下in1
這時候雖然是因為in1改變進入always裡面
不過它仍會執行a=0。

所以請問是:

a.要避免這種行為?
b.有其它寫法?

///////////題外話///////////

為什麼會用到這個呢，
原因就是我們的fpga板子的七段顯示器

它一次只能控制一個數字，所以要一次顯示4個數字的時候（EX:1142）
要先跳到第一個七段顯示器
然後顯示1
接著跳到第二個
然後顯示1
……
刷快一點就像1142了

現在的問題是我想要更改數字，
七段顯示器在兩種情況下會改值

一是它很快的刷刷刷
二是因為我按下更改數字的按鈕

他在刷的時候，觸發的是clock
改數字的時候，觸發的是按鈕

這不同的兩個情況，要對同一個值（七段顯示器）作不一樣的變更動作

如果always可以分開寫就好了……

--
儘管生命的起源只是一種化學反應
儘管人類的存在只是記憶數據的影子
儘管靈魂並不存在，精神只是神經細胞的火花
　　儘管世上沒有神，人一定要靠一己之力在這殘酷的世界中掙扎求存
　我還是......
我還是...... 要以意識之名命令你───「活下去」

--

※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.114.216.126
※ 編輯: henry666666 來自: 140.114.216.126 (04/05 18:41)

推 arksbubble:寫一個case怎麼樣? 針對in0 in1的四種組合做判斷 04/05 18:53

→ arksbubble:這樣應該就可避掉in0還沒放開時輸入in1的問題了 04/05 18:54

推 finalhaven:因為你in0先按了阿，所以他就一直作到in0條件成立 04/05 18:55

→ finalhaven:他就跳出那個always迴圈了@@，當然不會跳到in1裡面去 04/05 18:56

→ finalhaven:就如上面大大講得用Case就可避免XD 04/05 18:56

還是不會寫Q__Q

case({in1,in0})
有以下幾種排列
00
01
10
11

那這個00呢，

究竟是 10 (in0按住不放) 的時候按下「in1」變成的，

還是 01 (in1按住不放) 的時候按下「in0」變成的？

前者的話是in1 trigger的，後者相反呢……
※ 編輯: henry666666 來自: 140.114.216.126 (04/05 19:05)

推 ksmrt0123:把輸入(按鈕處理與register值變更)與輸出(把register值 04/05 20:25

→ ksmrt0123:以scan方式在7-seg顯示)分別寫成兩個blocks 04/05 20:26

這樣寫會過嗎？

串一下這篇文章開頭，似乎不行呢

還是我理解錯誤？

……

或者指的是下面這種方法

顯示器為D[7:0]

然後暫存是r1[7:0] r2[7:0] r3[7:0] r4[7:0]

scan的block裡

更改D對應到r1 r2 r3 r4

再來一個block

更改r1 r2 r3 r4裡的值

然後因為改的東西不一樣，就會過

是這嗎？

※ 編輯: henry666666 來自: 140.114.216.126 (04/05 21:03)
scan應該可以用迴圈寫的說……嗯
※ 編輯: henry666666 來自: 140.114.216.126 (04/05 21:05)

推 ksmrt0123:嗯... 就是這樣 04/05 21:33

目前scan的問題已經解決了，用上面的方法

→ ksmrt0123:補充一下, 你code問題不在分block, 分block也無法解決 04/06 00:12

→ ksmrt0123:multiple drivers for a net 的問題... 問題在那你沒給 04/06 00:13

→ ksmrt0123:完整的code看不太出來... 可能是 scan 的處理沒弄好, 04/06 00:14

→ ksmrt0123:也可能是"改數字的時候，觸發的是按鈕"這句話... 04/06 00:15

^^^^^^^^^^^^^^^^^^^^^^^^^^
其實是改數字的時候，觸發的是按鈕
可是if判斷成clock
--

那如果回到上面的code
(叫multiple drivers for a net?)
是不可能辦到的嗎？
※ 編輯: henry666666 來自: 140.114.216.126 (04/06 12:56)

推 ksmrt0123:抱歉 multiple drivers 是最上面的code 不是你的頭昏了 04/06 21:40

→ sneak: 寫一個case怎麼樣? https://muxiv.com 11/11 15:03

→ sneak: 他就跳出那個alway https://noxiv.com 01/04 21:54

... <看更多>

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reg clk_02s,clk_009s,clk_2s,clk_001s,clk_007s;. always @(posedge CPUCLK or negedge START) begin. if(START == 0) begin. regs_02s = 1000000;. clk_02s = 0;. ... <看更多>

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引述《tkhan (腦殘綠吱吱)》之銘言： : 標題: Re: [請益] verilog如何在一個always判斷觸發源？ : 時間: Fri Apr 18 00:27:29 2008 ...

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#62. always block triggered on rising and falling edge of signal

I'm new to Verilog and the world of programmable logic, so apologies in advance if I'm being oblivious to something.

#63. Correct Methods For Adding Delays To Verilog Behavioral ...

inside of an always block. This coding style is flawed as it can either easily produce the wrong output value or can propagate inputs to an output in less ...

#64. Advanced Verilog Continuous Assignments

All data types in always blocks must be declared as a 'reg' type. This is required even if the data type is for combinational logic. The always block 'executes' ...

#65. Verilog · GitHub

reg clk_02s,clk_009s,clk_2s,clk_001s,clk_007s;. always @(posedge CPUCLK or negedge START) begin. if(START == 0) begin. regs_02s = 1000000;. clk_02s = 0;.

#66. always blocks

always comb creates strictly combinatorial logic ... 1”Nonblocking Assignments in Verilog Synthesis, Coding Styles That Kill!, Clifford.

#67. Verilog

output [WIDTH-1 : 0] out; reg. [WIDTH-1 : 0] out; input clk, reset; wire clk, reset; always @(posedge clk) if (~reset) out = out + 1; always @(reset).

#68. always block內省略else所代表的電路(SOC) (Verilog)

描述. Abstract 在Verilog中，always block可以用來代表Flip-Flop, Combination Logic與Latch，本文比較 ...

#69. Verilog 程式區塊(Procedural Blocks) - 簡單也是另一種快樂

Exp : Verilog HDL語法. Initial. begin. <程式片段>. end. 2. always block. a、以always為主的程式區塊，只有每當觸發條件成立時，執行一次，執行 ...

#70. Synchronous Logic - Verilog - Alchitry

If you see a flip flop without an en signal it is just assumed that the flip flop is always enabled. Creating the blinker module. We are going to modify the ...

#71. Problem sets - HDLBits

1 Getting Started; 2 Verilog Language. 2.1 Basics; 2.2 Vectors ... Procedures include always, initial, task, and function blocks.

#72. Lecture 4- Verilog HDL-Part 2

right is an attempt to specify this using the always + case construct in Verilog. The case variable 'sel' is 2-bit wide, and therefore has 4 possibilities.

#73. Verilog-AMS Language Reference Manual

Analog and Mixed-signal Extensions to Verilog HDL. Version 2.4.0, May 30, 2014 ... an initial or always block of a Verilog-AMS module.

#74. 【Verilog】always文の条件分岐①if文の要点をまとめました ...

本サイトではalways文を順序回路として扱う前提で解説します。予備知識 Verilog HDLでのreg宣言順序回路はalways文で記述 if文.

#75. Verilog coding styles - Hardware Development best practices

In verilog, if we want to create sequential logic can use a clocked always block with non-blocking assignments. If on the other hand we want ...

#76. 初めてでも使えるVerilog HDL文法ガイド ―― 記述スタイル編

これがRTLです． RTLの記述には，以下の五つの記述スタイルがあります． assignによる組み合わせ回路; functionによる組み合わせ回路; alwaysによる ...

#77. Verilog is the Key Tool

RTL and schematic design used to support Verilog ... Always inside procedural blocks (always ... output reg g; \\ Verilog 2001 syntax. > Wire declarations.

#78. Basics of digital verilog design(alok singh kanpur) - SlideShare

WA 1 Digital Design Using Verilog ) begin modulebeta(clk,reset,irq,… ... Spring 2005 02/04/05 always @(posedge clk assign pcinc = pc + 4; for (i=0; i < 31; ...

#79. 3.2 Verilog - Behavioral Modeling - Electrical Engineering

1 always and reg. Behavioral modeling use the keyword always. Target output is of type reg. Unlike a wire, reg is updated only when a new value ...

#80. Answer to Quiz #9 - ZipCPU

In general, Verilog imposes no ordering on when always @(*) blocks areexecuted. The only required ordering is that the statements within ...

#81. Digital Systems Design Using Verilog - MOBO

always @(posedge clk ) begin - MIT OpenCourseWare. Sequential Multiplier - Digital System Design. Digital Systems Design Using Verilog | Charles Roth, ...

#82. verilog always 구문 - Korea

verilog always 구문 8 nov. 2019 — Verilog의 조건문은 if, else, repeat, while, for , case 등이 있습니다. . 단순히 조건만 보는 게 있고 조건에 ...

#83. Verilog D Flip Flop

Recently, I had seen some D flip-flop RTL code in verilog like this: module d_ff ( input d, input clk, input reset, input we, output q ); always @ (posedge ...

#84. Clang-Format Style Options — Clang 17.0.0git documentation

BAS_AlwaysBreak (in configuration: AlwaysBreak ) Always break after an open bracket, if the parameters don't fit on a single line, e.g.:.

#85. Ece270 Purdue - Invest Bauelemente

THE ECE 270 VERILOG SIMULATOR – SPRING 2020 4 Introduction Figure 1: A ... hw7 Practice using behavioral Verilog constructs (always blocks, case, if, ...

#86. Verilog - Introduction - ELECTRONIC BIT

Verilog is a hardware description language(HDL) used to model digital ... into the hardware details using structured procedures (like always and initial), ...

#87. 6小时掌握Verilog语法

Verilog 零基础入门 · 明德扬_ verilog 零基础入门语法HDL仿真快速掌握-手把手教你写FPGA/ASIC代码设计流程中的应用 · 特权同学《 Verilog 边码边学》基于Xilinx ...

#88. Pseudocode Examples - UNF

Endif; Call ... with (parameters); Call; Return ....; Return; When; Always use scope terminators for loops and iteration. As verbs, use the words Generate, ...

#89. Solved Design the following circuit in Verilog, be careful - Chegg

Question: Design the following circuit in Verilog, be careful with syntax and all language rules, commas, semicolons etc. (Any mistake, even if small, ...

#90. Ece270 Purdue - JJGraphy

THE ECE 270 VERILOG SIMULATOR – SPRING 2020 4 Introduction Figure 1: A ... hw7 Practice using behavioral Verilog constructs (always blocks, case, if, ...

#91. MTS Silicon Design Engineer in Hyderabad, India

Experience in design verification experience, inclusive of OOP coding experience (UVM, System Verilog, Specmane or C++) and SV Assertions.

#92. What does always (*) mean in Verilog?

What does always (*) mean in Verilog? ... The (*) means "build the sensitivity list for me". For example, if you had a statement a = b + c; then ...

#93. SystemVerilog Topic - Localparam - FullChipDesign

SystemVerilog Localparam code and comparision with defparam and parameters. for local assignments only can't be overwritten from outside. Verilog rtl code ...

#94. 16 QAM MATLAB code

16e physical layer BPSK,qpsk. matlab vhdl verilog labview source codes rf ... are always found in 4G Phase Shift Keying PSK Modulation Code in MATLAB Binary ...

#95. Introduction to Logic Synthesis Using Verilog HDL

of an always block can be one or more statements; begin and end keywords are used to group multiple statements. The statement “reg y;” is included in each ...

#96. Digital Systems Design Using Verilog - 第 78 頁 - Google 圖書結果

More details on this form of always block are presented in Section 2.8. Wire and Reg The two Verilog data types that we have used so far are wire and reg ...

#97. Introduction to Logic Circuits & Logic Design with Verilog

This is accomplished in Verilog using procedural assignment. v There are two types of procedural blocks in Verilog, initial and always.