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Using DPI to get the current value of a signal

sdav
I'm using a C++ interface with SystemVerilog DPI to drive my Verilog simulation. From C++ I'd like to call a function which returns the current value of a Verilog signal. Ideally this function would take a string as an input parameter (e.g. "testbench.u1.u2.dout") and then return the reg value of the signal. I'm just not sure how to implement this in Verilog. $display, $monitor, $strobe all display to stdout (I know there are "file" versions of these system tasks, too). The TCL command "value" seems ideal, but how can I access the returned data in Verilog and then return it to C++? Anyway, I'm posting here because I've thought about this for a while and can't come up with an elegant way to do it. But, I'm convinced that there is a way and I'm not seeing it. Thanks, Shirley
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  • Thank you for the quick response and the pointer to VPI -- I'll take a look at it.  I have used the tutorials and engineering notebooks for DPI, but not for VPI.  I am using vpi_printf already, so it doesn't seem too foreign a concept to use more VPI functions in my environment.

    Shirley
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  • Thank you for the quick response and the pointer to VPI -- I'll take a look at it.  I have used the tutorials and engineering notebooks for DPI, but not for VPI.  I am using vpi_printf already, so it doesn't seem too foreign a concept to use more VPI functions in my environment.

    Shirley
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