ISE MAP出错：Pack:1107 - Pack was unable to combine the symbols listed below into a single IOB33 compon

Pack:1107 - Pack was unable to combine the symbols listed below into a single IOB33 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 IOB33 was chosen because the IO contains symbols and/or properties consistent with single ended I/O usage and a IOSTANDARD=LVDS_25 property. 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 "Q0_CLK1_GTREFCLK_PAD_N_IN_IBUF" (Output Signal = Q0_CLK1_GTREFCLK_PAD_N_IN_IBUF)
    PAD symbol "Q0_CLK1_GTREFCLK_PAD_N_IN" (Pad Signal = Q0_CLK1_GTREFCLK_PAD_N_IN)
Component type involved: IOB33
Site Location involved: R7
Site Type involved: IPAD

Pack:1107 -
Symbols involved:
    BUF symbol "Q0_CLK1_GTREFCLK_PAD_P_IN_IBUF" (Output Signal = Q0_CLK1_GTREFCLK_PAD_P_IN_IBUF)
    PAD symbol "Q0_CLK1_GTREFCLK_PAD_P_IN" (Pad Signal = Q0_CLK1_GTREFCLK_PAD_P_IN)
Component type involved: IOB33
Site Location involved: R8
Site Type involved: IPAD

说明：Q0_CLK1_GTREFCLK_PAD_N_IN 和 Q0_CLK1_GTREFCLK_PAD_P_IN是一对差分时钟输入，当keep hierarchy设置为no时，map成功，但是添加cdc时，有好多信号甚至整个模块不见了。当keep hierarchy设置为yes，map出现上述问题。

出现此error，应该是ucf里定义了管脚，但在工程里没用上，看看是哪个信号报错，再找找什么地方连错了就行。

原来是这对差分时钟转单端生成的时钟，用的时候信号名写错了，改正就ok了。

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