verilog simulator

Half-integer divider: The counter is triggered by the rising edge, so when the count is N-1, the Count trigger is flipped, the clock's falling edge changes to the rising edge, so the count value is 0, so every time the n+0.5-frequency clock is generated, the trigger clock is flipped once. , using XOR gate and 2-way module design pulse deduction circuit, pulse deduction is the input frequency and 2 output difference or results. ModuleFenpin (clk,rst_n,clk_out);inputCLK;inputRst_n;Outputclk_out;

Tri1SCL; at inout Tri1SDA; - - WireISDA,ISCL,OSDA,OSCL; - - mi2c U_MI2C ( - . CLK (clock), in . NRST (reset), - . A (a), to . Di (DI), + . WR (WR), - . SEL (SEL), the . ISCL (ISCL), * . ISDA (ISDA), $ . Da (DA),Panax Notoginseng . NOE (NOE), - . INTR (INTR), the . OSCL (OSCL), + . OSDA (OSDA) A ); the + AssignISCL =SCL; - AssignISDA =SDA; $ AssignSCL = (OSCL = =1'd0)? 1'D0:1'DZ; $

can improve the portability and readability of the program.5) macro definition is to replace a string with a macro name, that is, to make a simple permutation, not a grammar check. Pre-processing is still the same, regardless of the meaning is correct. The error only occurs when compiling a source program that has been expanded by the macro.6) macro definition is not Verilog HDL statement, do not need to add semicolons at the end of the line. If a se

1, Wire and Reg difference, the input and output is a line type, indicating the connection of hardware lines, to be assigned in the Always module needs the middle Reg variable, both through: Assign input/output =reg type intermediate variable2, case of the default can be used after the empty statement, default:;3, the combination of logic with blocking assignment (=, like C language, statement execution immediately after completion of assignment), the sequential circuit with a non-blocking assig

This article is originally from V3 College Www.v3edu.org,FPGA training SpecialistIn order to improve the reuse rate of our code, we can write the code of different functions and then connect to the top layer. We give a simple example, the following procedure, we implement the LED water.In the LED module, we first divide the system clock into 1HZ clock, and then use the crossover clock to control the flow of LED lights, but my crossover and led light flow is not the same project, just put the fre

I use the ADC081SD chip, Cpol:cs is pulled to low power sclk is high, Cpol for 1,cs was pulled to low power sclk for 0 o'clock, Cpol for 0;The Cpha:cs is pulled to the low level after the first clock edge is 0, and the second clock along the acquisition data is 1.When the corresponding acquisition data bits of the clock rise are stable, the rising edge is collected, and the clock falling along the corresponding acquisition data bits are collected along the falling edge.As shown in the SCLK, the

=1;din=data_reg[11];end10:begin sclk=0;end//11:begin Sclk=1;din=data_reg[10];end12:begin sclk=0;end//13:begin Sclk=1;din=data_reg[9];end14:begin sclk=0;end//15:begin Sclk=1;din=data_reg[8];end16:begin sclk17:begin Sclk=1;din=data_reg[7];sync=0;end18:begin sclk=0;end//19:begin Sclk=1;din=data_reg[6];end20:begin sclk=0;end//21:begin Sclk=1;din=data_reg[5];end22:begin sclk=0;end//23:begin Sclk=1;din=data_reg[4];end24:begin sclk=0;end//25:begin Sclk=1;din=data_reg[3];end26:begin sclk=0;end//27:begin

Integer i,j;Always @ (Posedge i_clk or Negedge i_rst_n) beginif (!i_rst_n) beginfor (i = 0; i for (j = 0; J R_WEIGHTONWEIGHTS0A[I][J] EndEndEndELSE beginR_WEIGHTONWEIGHTS0A[TEXEL_CNT_Y_R2][TEXEL_CNT_X_R2] EndEndWhy design compiler-think this isn't right?Because I_wghtgridh is a variable.This is OK.reg [4:0] r_weightonweights0a [7:0][7:0];Integer i,j;Always @ (Posedge i_clk or Negedge i_rst_n) beginif (!i_rst_n) beginfor (i = 0; i for (j = 0; J R_WEIGHTONWEIGHTS0A[I][J] EndEndEndELSE beginR_WEIGH

-1, the output clock is 1, so as long as the count value n-1 is half the input clock period, that is, the implementation of the n+0.5 divider clock, so it is a difficulty to maintain the n-1 half clock cycle. It can be found that because the counter is counted by the rising edge of the clock, it is possible to flip the count trigger clock when the count is n-1, and the falling edge of the clock becomes the rising edge. That is, when the count value is n-1, the clock falling edge becomes the risi

1 Explicit EventThe value changes on nets and variable can is used as events to trigger the execution of a statement.The event can also be based on the direction of the change that is, towards the value 1 (posedge) or towards the Value 0 (Negedge).-A Negedge shall is detected on the transition from 1 to X, Z, or 0, and from X or Z to 0-A Posedge shall is detected on the transition from 0 to X, Z, or 1, and from X or Z to 1　　　　@ (trig or enable) Rega = REGB; //Event "or" is the same as ","@ (trig

1 MemoriesMemories file format is shown below, and the address is specified as @ in hexadecimal. @003 00000011 00000100 00000101 00000110 00000111 00001000 000010 01　　　　With the above file it can be seen if the memory was large it would become very tedious to work out the address of a SPECIF IC byte, so it's normally a good idea-to-use milestones along the memory file, so a larger file could look something like T He following: @003 00000011 00

When calling DesignWare, there will usually be a Dw01_add # (a_width,bwidth) syntax, when it is doubtful why, and now it is the source of the search. Doubt whether their basic skills are not solid enough. The usage is as follows 1, Module_name # (Parameter1, Parameter2) inst_name (Port_map), 2, Module_name # (Parameter_name Value),. Parameter_name (Para_value)) Inst_name (port map), the # method is the same as the port map, module multiplier (A, B, product); nbsp Parameter a_width = 8, B_wid

Reg[3:0]i; always@ (PosedgeCLOCKor NegedgeRESET)if( !RESET)beginI4'D0;Start_sig 1'B0;Wrdata 8'D0; End Else Case(i)0: if(Done_sig)beginStart_sig 1'B0; I 'B1;End Else beginWrdata 8'D8; Start_sig 'B1;End 1: if(Done_sig)beginStart_sig 1'B0; I 'B1;End Else beginWrdata 8'D9; Start_sig 'B1;End

1.TWO always block style with combinational outputs (good style)The corresponding code is as follows:2-Paragraph summary:(1) The combinational always block sensitivity list was sensitve to changes on the state variable and all of the inputs Refe Renced in the combinaltional always block.This is generally used [email protected] (*) on the OK.(2) The combinaltional always block have a default next state assignments at the top of the "Always Block"(3) Default output assignments is made prior to the

Verilog reading and outputting data from text to textReprinted 2016-10-18 10:14:22 Because it is often used, but every time to patchwork to remember how to write code. So it is to tidy up, after the use of the time to directly read this article. 1. Read the text data Reading text data is written to the mem first, and then a single fetch is taken by the address of the control men. The sample code is as follows: reg [11:0] data_src_mem [0:1023];//define

September 16, 2016Author: dengshuai_superSource: http://blog.csdn.net/dengshuai_super/article/details/52554815Disclaimer: Please specify the author and source of the reprint. Download ue_chinese_23.20.0.34.exe and register machine Keygen.exeand Verilog.uew and vhdl.uew .File Download location: http://download.csdn.net/detail/dengshuai_super/9631413 Activation method:Http://jingyan.baidu.com/article/c275f6bad6ee38e33d756700.html Add Verilog and Vhdl

Error (10170): Verilog HDL syntax error at SDRAM_CONTROL.V (in) near text "' H"; Expecting ";" For the parameters defined internally in the. v file, parameter the reference with a ' number; For example: The parameter defined are as follows Parameter asize=23; Total address width;Parameter dsize=16; The data width is 16 bits;Parameter sc_cl=3; After the instruction delay is 3CLK;Parameter sc_rcd=3; The delay in reading data from SDRAM; At the time

on.A few other special tasks:c = $fgetc (FD); Read a byte to C.$swrite, $sformat (Output_reg, formal_string, list_of_argument) output to a reg variable in string format.$fgets (str, FD), read a line of characters into Str.$FSCANF (FD, format, args); Input to file FD as standard.$SSCANF (str, format, args), by standard input to Reg str.$fflush (FD); The buffer is immediately output to the FD file.Write Memory: $readmemb/READMEMH binary with 16 binary. REG[7:0] mem[1:256]; Initial $READMEMH ("Mem

The following is a Verilog procedure for obtaining the angle of a cordic algorithm in the vector mode under a circular system:/*=================================================================== ===========*\Filename:cordic.vdiscription: Coordinate rotation number calculation method. Through this algorithm, the vector coordinates of the input are iterated 9 timesCalculation, the modulus and phase angle of the vector are obtained.\*===================

Introduction How to convert C language code into Verilog HDL or VHDL? 2.1 Online Conversions: Http://c-to-verilog.com/online.html C-to-verilog.com is a Web site created by an academic study in the High level synthesis field of the University of Haifa (HAIFA). The compiler used for this site is a modified version of the Systemracer integrated system. The source code for this compiler is available for research purposes and has been distributed to a