NanDigits Design Automation

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3.12. Logic Cone ECO with ECO File configuration.

When the changes involve more than tens gates, Logic Cone ECO becomes a good option. The idea of Logic Cone ECO is to replace logic cone in old netlist by new re-synthesized netlist.

The feature can be executed by command line

gof -o sc_cone.log -synlib synthesis.lib -imp sdc_ori.flat.gv -ref sdc_mod.flat.gv -ecofile eco_file_sc.eco

-o  sc_cone.log  :   Output result written to sc_cone.log file.

-synlib synthesis.lib  :  Load in synthesis library file.

-imp sdc_ori.flat.gv  :   Old Netlist which needs some logic cone to be replaced.

-ref sdc_mod.flat.gv  :  Newly synthesized netlist.

-ecofile eco_file_sc.eco  :  ECO file. It has to be end with extension '.eco'

-nogui 0 : To display GUI windows when the ECO process is going on. By default GUI is disable in this mode.

The ECO file has the following syntax.

#This is an ECO file for GOF
set_eco_number ec056789
current_design send_controller
replace_register state_reg_0_ -pin "D"
replace_register state_reg_1_ -pin "D"
replace_register state_reg_2_ -pin "D"
write_eco -f verilog neweco_sdc.v

The above example can be download here. logic_cone_eco.tar.gz

 

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