用ml523板重新询问virtex5 xc5vlx110t

根据您需要的接口，您可以通过三种不同的方式在Virtex 5上执行I / O操作。
（1）GTP / GTX收发器。
这是性能最高的选项，提供3.75Gbps或6.5Gbps（分别用于GTP和GTX收发器）。
收发器总是使用LVDS;
他们不做单端I / O.
它们仅适用于特定引脚，并且这些引脚不能用作通用I / O，因此您必须仔细选择引脚。
（2）SelectIO上的LVDS。
通用I / O引脚（SelectIO）可在LVDS模式下提供高达1250Mbps的速率。
这为放置提供了更大的灵活性;
有数百个SelectIO位置。
但是，要使用LVDS，您必须选择合适的引脚对。
（3）SelectIO上的单端。
SelectIO引脚可在单端模式下提供高达800Mbps的速率。
这允许您选择器件上的几乎任何引脚（除了特殊功能的引脚 - 电源，GTP / GTX，专用JTAG引脚等）。
您使用哪一个完全取决于您正在连接的设备。



以下为原文

There are three different ways that you can do I/O on the Virtex 5, depending on what interfacing you need.
 
(1) The GTP/GTX transceivers. This is the highest performance option, offering 3.75Gbps or 6.5Gbps (for GTP and GTX transceivers respectively). The transceivers always use LVDS; they don't do single-ended I/O. They're only available on specific pins, and those pins cannot be used as general-purpose I/O, so you have to select your pins carefully.
 
(2) LVDS on SelectIO. The general-purpose I/O pins (SelectIO) can deliver up to 1250Mbps in LVDS mode. This gives far more flexibility in placement; there are hundreds of SelectIO locations. However, to use LVDS you do have to select appropriate pairs of pins.
 
(3) Single-ended on SelectIO. The SelectIO pins can deliver up to 800Mbps in single-ended mode. This allows you to pick almost any pin on the device (any except special-function ones - power supplies, GTP/GTX, dedicated JTAG pins, etc).
 
Which one you use depends completely on what device you are interfacing to.

谢谢您的回复。
但我想知道GTP / GTX和LVDS是什么意思？
由于这些缩写，我不明白。
:(
谢谢



以下为原文

thank you for your reply.
 
but I wonder what mean are the GTP/GTX and LVDS?
 
I don't understand due to these abbreviations. :(
 
thank you 

Gilin和GTX是Xilinx在Virtex 5上称之为高速收发器的东西。新一代有GTH，GTY等。
LVDS是低压差分信号。
它每个信号使用两条线，数据作为这两条线之间的差异。
理想情况下，两根导线在电路板上彼此相邻布线，因此任何噪声都会以相同的方式影响它们，并且它们之间的差异（接收器所关心的全部）根本不受影响。
LVDS几乎用于所有高速串行数据接口（例如SATA，USB，DisplayPort等）。



以下为原文

GTP and GTX are what Xilinx calls the high-speed transceivers on the Virtex 5. Newer generations have GTH, GTY, etc.
 
LVDS is low voltage differential signalling. It uses two wires per signal, and the data is taken as the difference between those two wires. Ideally the two wires are routed next to each other on the circuit board, so any noise affects them both in the same way and the difference between them (which is all the receiver cares about) is not affected at all. LVDS is used for virtually all high-speed serial data interfaces (eg. SATA, USB, DisplayPort, etc).