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Forums > Functional Verification > e

Subject: accessing hdl signals in mixed language env
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rprashant
Posts: 4
Online: User is Offline
10/03/2007 2:51 AM  
Hi, I have used define statements to acesses dut signals. Worked fine when the entire dut hierarchy was vhdl. Now with vhdl-verilog(netlist) specman says 'signal not found'.(it does exist) Eg:- define sig_a "~/c/b/a";-- where c--vhdl --and all heirachy at b and below is verilog. I am using sig_a inside a TCM which is a member of tb_env. Any solutions. Thanks, pr
stephenh
Posts: 77
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10/03/2007 4:20 AM  
You really should be using ports instead of computed names - the performance is better and it's more manageable.
e.g.

// declare the port<br>sig_a : inout simple_port of bit is instance; <br>// sig_a is a simulator signal rather than an e-to-e port<br>keep bind(sig_a, external);<br>// bind the HDL signal name.<br>// Can be done in top-level config file for best re-use<br>keep sig_a.hdl_path() == "~/c/b/a";  <br>

I've not used computed names for a long time, so I can't remeber if there were any known limitations on mixed HDL usage.
Maybe someone else can comment on that...
Steve H.
stephenh
Posts: 77
Online: User is Offline
10/03/2007 4:22 AM  
Sorry the forum mashed my code example!
Trying again:

// declare the port
sig_a : inout simple_port of bit is instance;
// sig_a is a simulator signal rather than an e-to-e port
keep bind(sig_a, external);
// bind the HDL signal name.
// Can be done in top-level config file for best re-use
keep sig_a.hdl_path() == "~/c/b/a";
Steve H.
hannes
Posts: 30
Online: User is Offline
10/03/2007 6:03 AM  

in mixed HDL environments it is important to make sure SPMN knows which interface adapter to use to access specific signals.
if you only have one HDL language then there is only one interface adapter. In mixed environments SPMN will use several interface adapters. you should read the documentation regarding the agent() attribute of units [e Language Reference - 5.3 Predefined Attributes and Methods for Any Unit]. this will define the correct agent to use and will ensure that the right signal is found.
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Forums > Functional Verification > e > accessing hdl signals in mixed language env


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