GoldSunMonkey 发表于 2013-6-20 20:42 
试一下这个兄弟的方法
谢谢！还有个问题我在chipescope ILA 中加入 DCM 输出的时钟信号，为啥 MAP 时就会报错？
Place:1136 - This design contains a global buffer instance,
<XLXI_5/clkout1_buf>, driving the net, <XLXN_2>, that is driving the
following (first 30) non-clock source pins.
< PIN: U_ila_pro_0/U0/I_TQ3.G_TW[0].U_TQ.D; >
This is not a recommended design practice in Spartan-6 due to limitations in
the global routing that may cause excessive delay, skew or unroutable
situations. It is recommended to only use a BUFG resource to drive clock
loads. If you wish to override this recommendation, you may use the
CLOCK_DEDICATED_ROUTE constraint (given below) in the .ucf file to demote
this message to a WARNING and allow your design to continue.
< PIN "XLXI_5/clkout1_buf.O" CLOCK_DEDICATED_ROUTE = FALSE; >
而且即便 在ucf 中按照它的提示 设这 成FALSE， 发现抓取的信号 也不对，
是不是不能观察时钟信号？
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