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NETFPGA概述

时间:2013-7-28 0:55:59 点击:

  核心提示:overviewThe NetFPGA is a low-cost platform, primarily designed as a tool for teaching networking har...

overview 

      The NetFPGA is a low-cost platform, primarily designed as a tool for teaching networking hardware and router design. It has also proved to be a useful tool for networking researchers. Through partnerships and donations from sponsor of the project, the NetFPGA is widely available to students, teachers, researchers, and anyone else interested in experimenting with new ideas in high-speed networking hardware.

Major Components
      A block diagram that shows the major components of NetFPGA platform is shown below.


     The NetFPGA platform contains one large Xilinx Virtex2-Pro 50 FPGA which is programmed with user-defined logic and has a core clock that runs at 125MHz. The NetFPGA platform also contains one small Xilinx Spartan II FPGA holding the logic that implements the control logic for the PCI interface to the host processor.
      Two 18 MBit external Cypress SRAMs are arranged in a configuration of 512k words by 36 bits (4.5 Mbytes total) and operate synchronously with the FPGA logic at 125 MHz. One bank of external Micron DDR2 SDRAM is arranged in a configuration of 16M words by 32 bits (64 MBytes total). Using both edges of a separate 200 MHz clock, the memory has a bandwidth of 400 MWords/second (1,600 MBytes/s = 12,800 Mbits/s).
     The Broadcom Gigabit/second external physical-layer transceiver (PHY) sends packets over standard category 5, 5e, or 6 twisted-pair cables. The quad PHY interfaces with four Gigabit Ethernet Media Access Controllers (MACs) instantiated as a soft core on the FPGA. The NetFPGA also includes two interfaces with Serial ATA (SATA) connectors that enable multiple NetFPGA boards in a system to exchange traffic directly without use of the PCI bus.

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