placemenet和从Virtex5到zynq设备的路由出现错误

你好，
我正在尝试在zynq设备上实现一个设计。
我已经在Virtex5设备上实现了它，它的工作非常好。
但是当我更改设备时，我在放置和路由阶段得到了以下错误。我更改了UCF文件，但我不明白这个错误是什么意思！
为什么它适用于Virtex5而不适用于zynq设备？
谢谢，
纳吉姆
错误：Pack：1107  -  Pack无法将下面列出的符号组合到单个IOB组件中，因为所选的站点类型不兼容。
进一步说明：组件类型由逻辑类型及其包含的逻辑的属性和配置决定。
在这种情况下，选择类型为IOB的IO组件，因为IO包含与输入，输出或双向使用一致的符号和/或属性，并且不包含需要更具体的IO组件类型的其他符号或属性。
请仔细检查逻辑元素的类型及其所有相关属性和配置选项是否与约束的物理站点类型兼容。
摘要：涉及的符号：BUF符号“rx_i_IBUF”（输出信号= rx_i_IBUF）PAD符号“rx_i”（填充信号= rx_i）涉及的组件类型：涉及的IOB站点位置：涉及的D11站点类型：IOPAD



以下为原文

Hello,

I am trying to implement a design on zynq device. I had implemented it on Virtex5 device and it works verry good. But when i change the device i got the error below in the placement and route phase. I changed the UCF file but i don't understand what is the meaning of this error ! and why it works on Virtex5 and not on zynq device ?

Thank you,
Najem

ERROR:Pack:1107 - Pack was unable to combine the symbols listed below into a
   single IOB component because the site type selected is not compatible.

   Further explanation:
   The component type is determined by the types of logic and the properties and
   configuration of the logic it contains. In this case an IO component of type
   IOB was chosen because the IO contains symbols and/or properties consistent
   with input, output, or bi-directional usage and contains no other symbols or
   properties that require a more specific IO component type. Please double
   check that the types of logic elements and all of their relevant properties
   and configuration options are compatible with the physical site type of the
   constraint.

   Summary:
   Symbols involved:
       BUF symbol "rx_i_IBUF" (Output Signal = rx_i_IBUF)
       PAD symbol "rx_i" (Pad Signal = rx_i)
   Component type involved: IOB
   Site Location involved: D11
   Site Type involved: IOPAD