关于XILINX的BITSLICE原语

QYiran

我想用BITSLICE原语代替IOSERDES来控制NAND FLASH的DQ线和DQS，功能仿真通过了，但是在VIVADO实现时报以下的错误，请问这是什么原因呢？有什么解决办法吗？
[Place 30-689] Failed to place BITSLICE_CONTROL cell U09_FLASH_IO_DRIVER_fast/loop44[0].io/byteDDR/u_BITSLICE_CTRL/BITSLICE_CONTROL_lo_halfbyte_inst on site BITSLICE_CONTROL_X2Y23 because U09_FLASH_IO_DRIVER_fast/loop44[0].io/byteDDR/u_BITSLICE_CTRL/BITSLICE_CONTROL_lo_halfbyte_inst Instance U09_FLASH_IO_DRIVER_fast/loop44[0].io/byteDDR/u_BITSLICE_CTRL/BITSLICE_CONTROL_lo_halfbyte_inst can not be placed in CONTROL of site BITSLICE_CONTROL_X2Y23 because the bel is occupied by U09_FLASH_IO_DRIVER_fast/loop44[0].io/byteDDR/u_BITSLICE_CTRL/BITSLICE_CONTROL_hi_halfbyte_inst. This could be caused by bel constraint conflict. Please check if the cell is used correctly in the design.

laojun001

将这个错误放到百度上，有一些网友以前也遇到类似的问题，会有一些提示的，近5，6年的仿真测试我遇到很多错误都是找百度解决的