CONFORMAL ECO : SPARE CELLS NOT MAPPED

Hi,

I am trying to implement an ECO with conformal ECO but it doesn't use the spare cells list that I give.

I am using the following commands:

add_spare_cell -sparecell *spare*
add_spare_cell -freed
report_spare_cell

optimize_patch -workdir ${work_dir} \
-library max.lib \
-instancenaming "${ECO_NAME}_inst_%d" \
-netnaming "${ECO_NAME}_net_%d" \
-sequentialnaming "${ECO_NAME}_reg_%s" \
-sdc ${REVISED_PATH}/${IP_NAME}_timing_constraints.sdc \
-SUPPRESS_SDCError \
-rcexec "rc -nogui " \
-USESPARE \
-verbose

Note that the report_spare_cell command reports all the spare cells without any issue.

Also I have tried to use 'eco_synthesize_without_spare_cells false' variable but I don't where to put it in my script.

Thanks for your help.

Nabil