verilog hardware system-verilog iverilog icarus

SystemVerilog support of icarus (iverilog compiler)

I am using iverilog on a Mac, and I have problem compiling some codes that include always_ff and always_comb blocks. ModelSim compiles those codes without any problem. Is it possible to configure iverilog so as to support always_ff and always_comb blocks, or they are just not supported by the compiler?

Solution

always_comb, always_latch and always_ff are some of the keywords that were introduced in the SystemVerilog IEEE Std 1800-2012. They are not part of the Verilog IEEE Std 1364-2005, which is what the Icarus Verilog compiler supports.

I am not aware of any free SystemVerilog simulators. However, you can always simulate and synthesize your SystemVerilog design using EDA Playground.

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