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Information / questions / SDF annotation issues with Icarus
After 04/30/2026 23:59
gf180mcu_as_sc_mcu7t3v3
The SDF contains entries like:
(IOPATH A Y (...))
for cells such as:
gf180mcu_as_sc_mcu7t3v3__inv_2
gf180mcu_as_sc_mcu7t3v3__buff_2
But the Verilog model I have for gf180mcu_as_sc_mcu7t3v3.v appears to be functional-only. For example, the cells only have assignments like:
assign Y = !A;
assign Y = A;
and I do not see specify / endspecify timing blocks. Because of that, Icarus reports errors like:
Unable to match ModPath A -> Y
The smoke test still passes functionally, but SDF annotation is not clean.
Is there a timing-capable Verilog model for gf180mcu_as_sc_mcu7t3v3 with specify blocks? Or is timed GLS expected to be done with a different GF180 standard-cell library like gf180mcu_fd_sc_mcu7t5v?
Any guidance would be appreciated!
