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AR# 10767: 3.1i NGDBUILD - ERROR NgdBuild 519 - The EQN value of "()", on the LUT4 symbol "I3", is not a valid equation (520, 522).
3.1i NGDBUILD - ERROR NgdBuild 519 - The EQN value of "()", on the LUT4 symbol "I3", is not a valid equation (520, 522).
Keywords: Exemplar, Leonardo, Spectrum, ROM, INIT
General Description: Leonardo Spectrum 2000.1b writes out an EDIF netlist that contains LUT4 with empty INIT and EQN. This is causing the following NGDBuild error:
ERROR:NgdBuild:519 - The EQN value of "()", on the LUT4 symbol "I3_notri_ix1375_ix218", is not a valid equation. ERROR:NgdBuild:520 - The above-referenced equation has the following error: Unexpected ')'.
This is a known issue related to the ROM mapping mechanism in Leonardo Spectrum, and it is scheduled to be fixed in Leonardo Spectrum 2001.1a.
The workaround is to UNSET the ROM mapping variable as follows:
set enable_xcv_rom_mapping FALSE
NOTE: In the TCL script, this variable should be set before using the "optimize" command.