热度 2
2018-9-29 21:12
10938 次阅读|
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跟着实验指导书,难得的又遇到问题了,在最后生成Bitstream的时候出错了,无法生成Bitstream。 报错信息如下 Unspecified I / O Standard : 4 out of 134 logical ports use I / O standard ( IOSTANDARD ) value 'DEFAULT' , instead of a user assigned specific value . This may cause I / O contention or incompatibility with the board power or connectivity affecting performance , signal integrity or in extreme cases cause damage to the device or the components to which it is connected . To correct this violation , specify all I / O standards . This design will fail to generate a bitstream unless all logical ports have a user specified I / O standard value defined . To allow bitstream creation with unspecified I / O standard values ( not recommended ), use this command : set_property SEVERITY { Warning } . NOTE : When using the Vivado Runs infrastructure ( e . g . launch_runs Tcl command ), add this command to a . tcl file and add that file as a pre - hook for write_bitstream step for the implementation run . Problem ports : LEDs_out_0 . Unconstrained Logical Port : 4 out of 134 logical ports have no user assigned specific location constraint ( LOC ). ... Problem ports : LEDs_out_0 . 在我绝望的时候在网上搜到了解决方法,问题还是出在了XDC文件上 我是直接复制的实验指导书中的XDC文件中的内容,但是在生成ked_controller这个ip核的port的时候,生成的port的名字和实验中的并不一样。 xdc文件内容如下: set_property PACKAGE_PIN M14 }] set_property IOSTANDARD LVCMOS33 }] set_property PACKAGE_PIN M15 }] set_property IOSTANDARD LVCMOS33 }] set_property PACKAGE_PIN G14 }] set_property IOSTANDARD LVCMOS33 }] set_property PACKAGE_PIN D18 }] set_property IOSTANDARD LVCMOS33 }] 注意下我的DRC报错信息就会发现一个重要的信息 Problem ports : LEDs_out_0 这报错的port似乎有点不对劲,和约束文件中声明的port不一样,这也是为什么报错说LEDs out 0这个port unspecified的原因,因为你XDC中声明的是LEDs_out啊。 解决方法很简单,把这个port的名字改了就好,更改方法如图。 - END - 个人博客