check the delay cell for hold fixing
spacing rules
extract_rc -est
tap width 0.56um
how to read/use err mky db ?
set cache_read cache_write
focal_opt -hold_end_points all -effort medium/high
2.52 um width m6 straps
-153ps ( clock_en ) ( -131ns ), 78.17% utilization short 55, DRC 992
get_cells/get_flat_cells/get_physical_cells
report_timing -delay min
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