ISE14.7常见警告及处理方法
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2021-01-20
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ISE14.7常见警告及处理方法常见警告及处理方法
Xst:2677 – Node of sequential type is unconnected in block .
检查信号是否进行了声明，如果未声明，默认信号位宽为1bit。
WARNING:Xst:1290 – Hierarchical block is unconnected in block .
It will be removed from the design.
查看RTL视图，检查模块连线情况，根据实际情况，将被优化的线路使用 指令防止被优化即可。
WARNING:Xst:1710 – FF/Latch (without init value) has a constant value of 0 in block . This FF/Latch will be trimmed
during the optimization process.
检查位宽是否有冗余，将位宽修改为当前足够的位宽即可消除该警告。
ERROR:HDLCompiler:718 – “**” Line 1588: Port connections cannot be mixed ordered and named
检查模块例化时，是否有缺少引号和点的情况。
HDLCompiler:413 – “**” Line 334: Result of 32-bit expression is truncated to fit in 1-bit target.
检查信号是否进行位宽定义，如果没有定义，该信号默认位宽为1，所以就会出现位宽不相符的情况。
WARNING:Xst:1710 – FF/Latch (without init value) has a constant value of 0 in block . This FF/Latch will be trimmed
during the optimization process.
查看该信号模块，发现书写方式等没有问题，那么就有可能是与该信号相关的一些信号出现问题，导致该信号也出现问题，查
看与该信号相关的信号是否正常。
WARNING:Xst:1898 – Due to constant pushing, FF/Latch is unconnected in block .
WARNING:Xst:1895 – Due to other FF/Latch trimming, FF/Latch (without init value) has a constant value of 0 in
block . This FF/Latch will be trimmed during the optimization process.
作者：FPGA Learner
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