risc

说明：  卫星信道模拟器能够模拟卫星信道的传播特性，用于设备的通信调试，节 约研发成本。目前，很多卫星信道模拟器在参数设置上存在问题：有的参数难 以调节；有的采用上位机进行参数设置，通过上位机设置参数需要连接电脑， 适应性差。针对上述问题提出了一种基于FPGA可触控卫星信道模拟器，FPGA 作为算法实现和控制单元，通过控制触摸屏方便快捷的实现参数设置。(Literature of Satellite Channel Simulation Based on FPGA)

FIFO is a First-In-First-Out memory queue with control logic that manages  the read and write operations, generates status flags, and provides optional  handshake signals for interfacing with the user logic. It is often used to  control the flow of data between source and destination. FIFO can be  classified as synchronous or asynchronous depending on whether same clock  or different (asynchronous) clocks control the read and write operations. In  this project the objective is to design, verify and synthesize a synchronous  FIFO using binary coded read and write pointers to address the memory  array. FFIO full and empty flags are generated and passed on to source and  destination logics, respectively, to pre-empt any overflow or underflow of  data. In this way data integrity between source and destination is maintained.  The RTL description for the FIFO is

AD8176的控制verilog编写，可实现RGB的自由切换，16通道进，9通道输出。

Verilog控制lcd1206显示源程序(Verilog control lcd1206 display source program)

Simple UART for FPGA is UART (Universal Asynchronous Receiver & Transmitter) controller for serial communication with an FPGA. The UART controller was implemented using VHDL 93 and is applicable to any FPGA. Simple UART for FPGA requires: 1 start bit, 8 data bits, 1 stop bit! The UART controller was simulated and tested in hardware.

使用sdi 对采集到是视频数据进行解码，转为bt656数据格式的数据进行输出

本应用指南描述了在 Virtex™-4 XC4VLX25 FF668 -10C 器件中实现的 DDR SDRAM 控制器。该实现运用了直接时钟控制技术来实现数据采集，并采用自动校准电路来调整数据线上的延迟。DDR SDRAM 器件是低成本、高密度的存储资源，在很多存储器供应商处均可获得。本设计使用 SDRAM 器件和 DIMM 开发而成。

FPGA控制m25p16flash芯片读写控制spi协议 可实现擦除写入读出功能(SPI protocol for read and write control of m25p16 flash chip controlled by FPGA Erase Write-Read Function)

说明：  本设计是基于FPGA的高速并行接口通信接口和协议设计，该设计使用的是8 位并行接口，通过配置FPGA的FIFO寄存器保证了在高速并行下的数据稳定性，在 最终的测试中，该协议能够稳定传输的速度为80Mbps。(This design is based on FPGA high-speed parallel interface communication interface and protocol design, the design uses 8 Bit parallel interface ensures the data stability under high-speed parallel by configuring the FIFO register of FPGA. In the final test, the protocol can stably transmit at 80 Mbps.)

步进电机驱动，32等级速度，带加减速度控制。verilog编写。(step motor driver,32 level speed.)