在添加管脚约束后，PAR提示以下错误： ERROR：lace:311 - The IOB DDRB_p is locked to site IOB_X0Y135 in bank 5. This violates the SelectIO banking rules. Other incompatible IOBs may be locked to the same bank, or this IOB may be illegally locked to a Vref site. ERROR：lace:207 - Due to SelectIO banking constraints, the IOBs in your design cannot be automatically placed. 我仔细查过了，DDRB_p 根本没有被分配在所谓得Vref site上，同时，在该IO bank里的所有管脚都是统一的2.5v的vcco供电，IOstandard是LVDS_25_DCI、LVDS_25及LVCMOS25。应该没有违背什么 SelectIO banking rules啊！有人知道原因吗？先谢了！作者: tdb_0 时间: 2006-9-4 09:18
