The system can be used as an example of how to build SMP systems on
FPGA and how to write applications for it.

In the software side, a modified version of xilkernel I have developed
is used to write multi-threaded applications that run on the SMP
system.

    xc_iface_t *iface;  //初始化interface

    xc_from_reg_t *fromreg_gray;  //初始化register
    xc_to_reg_t *toreg_red, *toreg_green, *toreg_blue; //初始化register
    xc_shram_t *shram; //初始化shared memory
    xc_to_fifo_t *tofifo; //初始化fifo

    // initialize the software driver
    xc_create(&iface, &RGB2GRAY_PLBW_ConfigTable[0]);

    // obtain the memory locations
    xc_get_shmem(iface, "result",  (void **) &fromreg_gray);  //Register 中间引号中的字符串是Sysgen中起的名字
    xc_get_shmem(iface, "red",   (void **) &toreg_red);
    xc_get_shmem(iface, "green", (void **) &toreg_green);
    xc_get_shmem(iface, "blue",  (void **) &toreg_blue);
    xc_get_shmem(iface, "cap_ram0", (void **) &shram);  //Shared Memory
    xc_get_shmem(iface, "fifo", (void **) &tofifo);  //Shared Memory

    //写Shared Memory
      for (i=0;i<10;i++) {
    xc_write(iface, xc_get_addr(shram->addr, i), (const unsigned) i+60);
  }

    //写Register
    xc_write(iface, toreg_red->din, 2);

    //读 Register
    xc_read(iface, fromreg_result->dout, &result);

In the following code snippet, users can read data from a "From Register" shared memory named "FROMREG1" and write it to a "To Register" shared memory named "TOREG1":
volatile unsigned value;
unsigned *fromreg_plb_data;
unsigned *toreg_plb_data;

// get the absolute shared memory addresses from "xparameters.h"
fromreg_plb_data = XPAR_SG_PLBIFACE_0_MEMMAP_FROMREG1;
toreg_plb_data = XPAR_SG_PLBIFACE_0_MEMMAP_TOREG1;

// read data from shared memory "FROMREG1"
value = *fromreg_plb_data;
// write data to shared memory "TOREG1"
*toreg_plb_data = value;

随着NetFPGA的在北美兴起，愈来愈多的人开始关注到这个最初只是斯坦福大学课堂教学使用的Project。仿佛让人看到最初Spice刚刚兴起的那个瞬间。

NetFPG把FPGA的可配置的特性带入了网络通讯领域，相信在不久的将来，它必将带给更多人更多的惊喜。

NetFPGA可以非常方便的使得研究人员或者高校学生搭建一个高速，硬件加速的网络系统。目前NetFPGA已经融入了斯坦福大学的课程中，教授学生如何设计硬件传送、传发数据的GigE的交换机与路由器。NetFPGA可以为更多的研究人员研究下一代网络提供一个开放的平台。NetFPGA现在所有的硬件代码与软件代码都是开源的。

system.xmp  -- 工程文件
system.mhs  -- 硬件描述
system.mss  -- 软件描述
implementation/system.bit  --硬件bit文件
implementation/system_bd.bmm  --BRAM的memory map
etc/download.cmd  -- 描述JTAG链信息