用VHDL写的4*4乘法器，学习VHDL语言的可以

本例介绍直接合成带阻滤波器的方法，n阶滤波器能实现n个传输零点(A direct synthesis technique of a new class of bandstop coupled resonator elliptic filters is presented. Two different coupling schemes, which both include source–load coupling are used. The first coupling and routing scheme is the standard folded structure used in implementing bandpass elliptic filters with transmission zeros using resonators.)

Xapp 200 64 bit DDR SDRAM design files for Xilinx Vertix

VHDL拔河电路的设计 基于cyclone V  VHDL拔河电路的设计 基于cyclone V VHDL巴赫电路的设计 基于cyclone V VHDL巴赫电路的设计 基于cyclone V VHDL巴赫电路的设计 基于cyclone V

由verilog编写的乘法器，通过两个文件的调用实现。由于子模块的调用使得程序简化了许多。(Prepared by the Verilog multiplier, through the realization of the two documents call. As the sub-modules to simplify the procedure call makes a lot.)

SPI接口的vhdl代码，可以实现与单片机的spi通信，完整的工程-SPI interface of the VHDL code can be achieved with SCM spi communication, complete works

counter number one to nine after 1s

说明：  HDB3编码通过verilog实现，通过modelsim仿真(HDB3 coding is implemented by Verilog and simulated by Modelsim)

  基于FPGA(Field-Programmable Gate Array)的OFDM(Orthogonal Frequency Division Multiplexing)信号传输系统VHDL源码 use IEEE.std_logic_unsigned.all; package outconverter is constant stage : natural := 3; constant FFTDELAY:integer:=13+2*STAGE; constant FACTORDELAY:integer:=6; constant OUTDELAY:integer:=9; function counter2addr( counter : std_logic_vector; mask1:std_logic_vector; mask2:std_logic_vector ) return std_logic_vector; function outcounter2addr(counter : std_logic_vector) return std_logic_vector; end outconverter; package body outconverter is function counter2addr( counter : std_logic_vector; mask1:std_logic_vector; mask2:std_logic_vector ) return std_logic_vector is variable result :std_logic_vector(counter"range); begin for n in mask1"range loop if mask1(n)="1" then result( 2*n+1 downto 2*n ):=counter( 1 downto 0 ); elsif mask2(n)="1" and n/=STAGE-1

数字钟(Digital clock)

说明：  risc 8 by coonan compatible with PIC16C57