LATTICE FPGA综合参数时报警告 unsupported property怎么解决？

提示中的都是 parameter 定义，为什么unsupported ?

Unsupported property c_tRCD found - ignoring…
Unsupported property c_idle found - ignoring…
Unsupported property i_ready found - ignoring…
Unsupported property i_tRFC2 found - ignoring…
Unsupported property i_AR2 found - ignoring…
Unsupported property i_tRFC1 found - ignoring…
Unsupported property i_AR1 found - ignoring…

这些parameter是状态机的状态，是有用到的。
综合用的是synplify Pro