A brief introduction of direct digital frequency synthesis (DD S), the use of DD...

通过PCI数据传输总线，实现PC到PCI板卡的高速数据传输，PCI总线使用9054芯片进行总线协议的转换(Realizing data transmission of PCI)

数字钟是一种用数字电路实现时，分，秒计时的装置，与机械性时钟相比具有更高的准确性和直观性，且无机械装置，具有更长的使用寿命，因此得到了广泛的使用。数字中从原理上讲是一种典型的数字电路，其中包括了组合逻辑电路和时序电路。因此，我们此次设计与制作数字钟就是为了了解数字钟的原理，从而学会制作数字钟，而且通过数字钟的制作进一步了解各种在制作中用到的中小规模集成电路的作用及实现方法。且由于数字钟包括组合逻辑电路和时序电路，通过它们可以进一步学习与掌握各种组合逻辑电路和时序电路的原理与使用方法。

带有异步清零、异步置位功能的边沿JK触发器(With asynchronous reset, asynchronous setting function of edge JK flip-flop)

本设计是基于FPGA设计一个地铁自动售票系统。 本设计采用自顶向下的模块化设计方法，基于FPGA使用VHDL语言设计制作一个地铁自动售票控制系统，该系统能出售2条线路3种不同价位的票，完成售票、找零、显示等功能。(The design is based FPGA design of a subway ticket vending system. This design uses a top-down, modular design method, a subway ticket vending control system based on FPGA using VHDL language design, the system can sell two lines of different priced tickets, complete the ticket, give change, display and other functions .)

design and implementation of a format conversion system on the Altera NIOS board(QUARTUS) which reads an analogue input, converts it into digital data, and then does the reverse conversion back into analogue format. This will be done by taking an analogue an analogue input using SPI MCP3202 12-Bit A/D converter to generate the digital data stream and then the digital data will be used to generate an analogue output using Analog Devices 8-bit SPI AD7303 D/A converter.

floating point divider

可实现找钱功能的自动售邮票机，可买两种邮票，一元的和五角的-Money function can be realized stamp vending machine, to buy two stamps, one dollar and the Pentagon

具有桥式结构的传感器很多，如利用应变原理、磁电阻原理和其他变电阻原理的传感器，可以实现对压力、位移、加速度、磁场等物理量的测试。这种结构的差分输出可以增加灵敏度，也有一定抵消外加干扰的能力。而且有的虽不是差分输出，比如电阻分压式的输出，可以认为是“半桥”，我们还可以人为的加上另一半，即加上一对精密电阻和一个电位器组成另一个分压电路，形成差分输出。每次调节电位器使差分输出为0，抵消零磁电压。-Bridge structure with many sensors, such as the use of contingency theory, the principle of magneto-resistance and other variable resistance sensor principle can be achieved on the pressure, displacement, acceleration, magnetic field, such as physical tests. The structure of the differential output can increase sensitivity, but also have some ability to offset the additional interference. And some is not a differential output, such as pressure resistance of the output type, you can think is

HDMI做为视频输出输入接口已经广泛使用很长时间，主要通过TMDS差分编码传输。本实验通过在HDMI屏幕上显示彩条和输入输出环通实验，来练习视频的时序和视频颜色的表示，为后面视频处理实验做个基础。(HDMI as video output input interface has been widely used for a long time, mainly through TMDS differential coding transmission. In this experiment, by displaying color bars and input/output loop experiments on HDMI screen, video timing sequence and video color representation are practiced to lay a foundation for video processing experiments later)

xilinx FPGA设计需要的DDR2文件，可以应用于实际设计中(xilinx FPGA design needs DDR2 files that can be applied to the actual design)