@W: MT246 :"/share/gwsw/gowin_new/Gowin/Gowin_YunYuan_V1.9.xBeta/IDE/ipcore/IIR_Filter/data/iir_top.v":46:16:46:23|Blackbox MULT18X18 is missing a user supplied timing model. This may have a negative effect on timing analysis and optimizations (Quality of Results)
@W: MT246 :"/share/gwsw/gowin_new/Gowin/Gowin_YunYuan_V1.9.xBeta/IDE/ipcore/IIR_Filter/data/iir_top.v":46:16:46:23|Blackbox MULT18X18 is missing a user supplied timing model. This may have a negative effect on timing analysis and optimizations (Quality of Results)
@W: MT246 :"/share/gwsw/gowin_new/Gowin/Gowin_YunYuan_V1.9.xBeta/IDE/ipcore/IIR_Filter/data/iir_top.v":46:16:46:23|Blackbox MULT18X18 is missing a user supplied timing model. This may have a negative effect on timing analysis and optimizations (Quality of Results)
@W: MT246 :"/share/gwsw/gowin_new/Gowin/Gowin_YunYuan_V1.9.xBeta/IDE/ipcore/IIR_Filter/data/iir_top.v":46:16:46:23|Blackbox MULT18X18 is missing a user supplied timing model. This may have a negative effect on timing analysis and optimizations (Quality of Results)
@W: MT420 |Found inferred clock IIR_Filter_Top|clk with period 6.16ns. Please declare a user-defined clock on port clk.
