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keegandent's avatar
keegandent
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1 year ago

Error (10742): Verilog HDL error: constant expression cannot contain a hierarchical identifier

It seems this issue may not have been resolved, at least not in a way that applies to SystemVerilog `interface` objects. This is a toy example, but I can provide Quartus project upon request. I am u...
Hdl
RichardT_altera's avatar
RichardT_altera
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1 year ago

Hi,


Do you able to share the project?


Regards,

Richard Tan


  • keegandent's avatar
    keegandent
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    1 year ago

    I have attached a Quartus archive of an example project. You should be able to see it creates the error message:

    Error (10742): Verilog HDL error at axis_thrower.sv(6): constant expression cannot contain a hierarchical identifier

    This should not be the case. With both Vivado and Verilator, the expression is allowed because their compilers deduce what is obviously constant at compile-time. Without support for this feature, interfaces are largely useless as their associated metadata has to be passed via separate channels regardless.