请教Spartan6里硬核DDR2内存控制器问题

我打算用Spartan6内嵌的硬核去控制DDR2 内存，在MIG里产生了memory Interface，然后自己写顶层模块，调用MIG产生的控制模块，并添加了MIG自动生成的UCF文件，综合可以通过，但是Map过不了，报错如下： ERROR:Place:1333 - Following IOB's that have input/output programming are locked to the bank 1 that does not support such values IO Standard: Name = LVDS_25, VREF = NR, VCCO = 2.50, TERM = NONE, DIR = BIDIR, DRIVE_STR = NR List of locked IOB's: mcb4_dram_udqs mcb4_dram_dqs mcb4_dram_dqs_n mcb4_dram_udqs_n 对mcb4_dram_udqs，mcb4_dram_dqs，mcb4_dram_dqs_n，mcb4_dram_udqs_n这几个信号IO口位置的分配和类型的定义是按照MIG自动生成的ucf文件来的，应该不会有错的呀？我用的是ISE12.1，这个问题在网上也有人问过，但是没有说具体的解决方法，麻烦大家帮忙看看，谢谢！

you may look at existing solution, many boards have it works, say http://www.digilentinc.com/Products/Detail.cfm?NavPath=2,400,836&Prod=ATLYS, or
http://danstrother.com/2011/01/16/spartan-6-bga-test-board/
I think there are test routines there, refer to xilinx link inside above links

谢谢啊~~

请问下，这个问题解决了吗？能不能把方法告诉我啊？