请版主和各位高手帮忙。

我用的板子是straix gx的开发板，需要用到ddr sdram，我看文档里说了要使用pll，我照着altpll Megafunction这个文档里添加了pll，但却不知道怎么连接pll的输出和ddr控制器的时钟输入。现在编译时总是出现如下问题：

Error: Atom "ddr_dqs_to_and_from_the_ddr_sdram_0[0]" has port DELAYCTRLIN that must be connected from a DLL delay control output
Error: Atom "ddr_dqs_to_and_from_the_ddr_sdram_0[1]" has port DELAYCTRLIN that must be connected from a DLL delay control output
Error: Atom "ddr_dqs_to_and_from_the_ddr_sdram_0[2]" has port DELAYCTRLIN that must be connected from a DLL delay control output
Error: Atom "ddr_dqs_to_and_from_the_ddr_sdram_0[3]" has port DELAYCTRLIN that must be connected from a DLL delay control output
Error: Atom "ddr_dqs_to_and_from_the_ddr_sdram_0[4]" has port DELAYCTRLIN that must be connected from a DLL delay control output
Error: Atom "ddr_dqs_to_and_from_the_ddr_sdram_0[5]" has port DELAYCTRLIN that must be connected from a DLL delay control output
Error: Atom "ddr_dqs_to_and_from_the_ddr_sdram_0[6]" has port DELAYCTRLIN that must be connected from a DLL delay control output
Error: Atom "ddr_dqs_to_and_from_the_ddr_sdram_0[7]" has port DELAYCTRLIN that must be connected from a DLL delay control output

可是我查找开发板的datasheet，根本找不到描述相关引脚分配的部分，也没看到pll的配置中有讲dll的部分。请问是要用.bdf文件来指定pll和ddr的连接吗？请各位给一个实例参考，感激不尽。