xps编译出错，求解答
时间：10-02
整理：3721RD
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ISE版本是13.2，在xps环境下用chipscope创建IP核对工程进行调试。工程对应的是xilinx atlys板子，以下三个出错的接口都属于MCB_DDR2模块，接入的IP核是VIO核与ila核。这种错误该怎么解决呢?
ERROR:NgdBuild:809 - output pad net 'fpga_0_MCB_DDR2_mcbx_dram_ras_n_pin' has an
illegal load:
ERROR:NgdBuild:809 - output pad net 'fpga_0_MCB_DDR2_mcbx_dram_cas_n_pin' has an
illegal load:
ERROR:NgdBuild:809 - output pad net 'fpga_0_MCB_DDR2_mcbx_dram_we_n_pin' has an
illegal load:
ERROR:Xflow - Program ngdbuild returned error code 2. Aborting flow execution...
ERROR:NgdBuild:809 - output pad net 'fpga_0_MCB_DDR2_mcbx_dram_ras_n_pin' has an
illegal load:
ERROR:NgdBuild:809 - output pad net 'fpga_0_MCB_DDR2_mcbx_dram_cas_n_pin' has an
illegal load:
ERROR:NgdBuild:809 - output pad net 'fpga_0_MCB_DDR2_mcbx_dram_we_n_pin' has an
illegal load:
ERROR:Xflow - Program ngdbuild returned error code 2. Aborting flow execution...