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Hi all, This is my first SystemC/SystemC-AMS code, so please ignore any bad coding that might exist. I wanted to design a PLL just to test SystemC-AMS. The code is available at: https://github.com/americodias/systemc-ams_pll It is working, but I had to change the signals UP and DN from sc_signal<bool> to sc_signal<unsigned char>. If I use bool I get the following linking problem: Undefined symbols for architecture x86_64: "sca_tdf::sca_de::sca_in<bool>::bind(sc_core::sc_port_b<sc_core::sc_signal_in_if<bool> >&)", referenced from: vtable for sca_tdf::sc_in<bool> in main.cpp.o "sca_tdf::sca_de::sca_in<bool>::trace(sc_core::sc_trace_file*) const", referenced from: vtable for sca_tdf::sc_in<bool> in main.cpp.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) Using "sc_bit" also fix the problem, but this type is deprecated. I am using SystemC 2.3.1 and SystemC-AMS 2.1. Thanks in advance. PS: The issue seems to be on the chargepump ams module when I use "sca_tdf::sc_in<bool>" do declare UP and DN. Américo