Re: Astro-reg.
SPEF is an Open Verilog Initiatve (OVI)--and now IEEE--format for defining netlist parasitics. SPEF is NOT identical to the SPF format, although it is used in a similar manner. SPEF includes resistance and capacitance parasitics. SPEF can represent parasitics in detailed or reduced (pi-model)forms, with the reduced form probably being more commonly used. SPEF also has a syntax that allows the modeling of capacitance between different nets, so it is used by the PrimeTime SI (crosstalk) analysis tool. SPEF is smaller than SPF and DSPF because the names are mapped to integers to reduce file size.