请教FPGA error
时间：10-02
整理：3721RD
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我在FPGA设计里面例化个sram，然后综合有下面的报错，请教是什么原因呢?
ERROR:MapLib:978 - LUT5 symbol "u2_scaler/dut/u_shf_datwin/Mmux_n018381" (output
signal=u2_scaler/sram5_ada<7>) has an equation that uses input pin I4, which
no longer has a connected signal. Please ensure that all the pins used in the
equation for this LUT have signals that are not trimmed (see Section 5 of the
Map Report File for details on which signals were trimmed).
ERROR:MapLib:978 - LUT5 symbol "u2_scaler/dut/u_shf_datwin/Mmux_n018381" (output
signal=u2_scaler/sram5_ada<7>) has an equation that uses input pin I4, which
no longer has a connected signal. Please ensure that all the pins used in the
equation for this LUT have signals that are not trimmed (see Section 5 of the
Map Report File for details on which signals were trimmed).
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