Xilinx虚拟连接，这是一种基于TCP/IP协议的通信技术，以实现JTAG功能，通过这样的连接，可以访问开发的FPGA或者SOC，而不需要通过传统的JTAG电缆。(Xilinx Virtual Cable (XVC) is a TCP/IP-based communication protocol that acts
like a JTAG cable and provides a means to access and debug your FPGA or SoC
design without using a physical cable. In this document are the general details
of this XVC 1.0 protocol.)