[工学]2 测控总线技术5_v04.ppt

* Here is a picture of several different PCIe card types. * With the National Instruments MXI-Express kits, you control PXI and CompactPCI systems from your desktop, server, or workstation PC through a fully transparent, high-bandwidth cabled PCI Express link. The MXI-Express link consists of a PCI Express board in a PC, connected via a MXI-Express cable to a PXI module in slot 1 of a PXI chassis. The PCI Express board is available in two configurations. The National Instruments PXI-PCIe8361 kit includes a PCI Express board with one x1 (“by one”) PCI Express link that provides up to 110 MB/s of sustained throughput when cabled to a PXI chassis. The National Instruments PXI-PCIe8362 kit provides two x1 PCI Express links, each of which you can cable to individual PXI chassis to provide up to a total of 160 MB/s of sustained throughput. The National Instruments PXI-8360 module, used in both kits, implements a PCI Express-to-PCI bridge. With MXI-Express, you can use PXI modules as if they are PCI boards directly installed in your PC. To learn more about MXI-Express, visit /pxi. * You can configure a complete PXI system by following five basic steps. * Now that we have converted a physical phenomena into a measurable signal (with or without signal conditioning), we need to acquire that signal. To do this we will need a terminal block, a cable, a Data Acquisition device, and a computer. By using this combination of hardware, we can transform a standard computer into a measurement and automation system. Next we will discuss each piece of our data acquisition system in more detail. * PCIe 物理层 点对点的差分互连 2个单向连接，无需控制信号 数据传输速率： 2.5Gb/s/pin/dir 同步时钟：内嵌时钟信号（8b/10b 编码） 接口宽度：每个方向 x1, x2, x4, x8, x12, x16, x32 Device A Frame Frame Sequence Number Packet Request CRC Frame CRC Packet Request Sequence Number Frame Data Data Data Data Clock Clock Device B X1 Lane * 8B/10B 编码 消耗 20% 的有效带宽 包含在 250 Mbytes/s 带宽指标中 保证最小的转换密度 允许在每次转换中恢复时钟 灵活的布线 无需解决时钟/数据信号的畸变问题 * PCIe 的发展 2002年，发布PCI E