利用MIG生成的IP核,根据开发板引脚图添加UCF文件后,通过综合和翻译。
映射时提示如下,需要限定IOSTANDARD for IOBUFDS,如何解决。
LIT:600 - IOBUFDS symbol "u_ddr2/u_ddr2_top_0/u_mem_if_top/u_phy_top/u_phy_io/gen_dqs[0].u_iob_dqs/gen_dqs_iob_ddr2.u_iobuf_dqs" (output signal=u_ddr2/u_ddr2_top_0/u_mem_if_top/u_phy_top/u_phy_io/gen_dqs[0].u_iob_d qs/dqs_ibuf) does not have IOSTANDARD specified. Map is unable to generate a default IOSTANDARD for IOBUFDS, one has to be explicitly provided.
dqs_ibuf是rtl的ddr2_phy_dqs_iob文件中的信号,我在UCF给出了NET "*/gen_dqs[0].u_iob_dqs/dqs_ibuf" IOSTANDARD = DIFF_SSTL18_II_DCI; 还是不行。 |