I am using ncsim 09.20-s016.
I have a VHDL DUT. The testbench top level is VHDL. But, I have a few Verilog modules in the testbench.
From one of the Verilog modules, I want to access (monitor) a signal inside the DUT (VHDL).
if (top.level_1.level_2.sigout_1 == 1'b1) $display("Posedge received at time: %d", $time) ;
I get the following error:
ncelab: *E,CUVHNF (...): Hierarchical name component lookup failed at 'top'.
1. Is it not possible to monitor a signal inside a VHDL block from a Verilog module?
In reply to Mickey:
I'm sorry, but I gave you incorrect information in the previous post. From a verilog scope you can't directly reference an object that begins with a vhdl instance. What you need to use is $nc_mirror to mirror that value of the object into a reg in a verilog scope. You can then use the verilog object in the code. for example:
$nc_mirror ("my_probe", ":top.level_1.level_2.sigout_1");
if (my_probe == 1'b1);
Feel free to email me at firstname.lastname@example.org if you have any questions.
Sorry for the confusion.
Your suggestion has worked very nicely! Thank you very much for your help.
I wasn't aware of the $nc_mirror() task which allows VHDL signals to be probed from Verilog module.
I also successfully experimented by calling a user-defined Verilog task() from a verilog island module inside a VHDL top-level DUT -- that also works fine.
For example, expanding on your example, the t_write() task call inside the island verilog module executes correctly in ncsim.
$nc_mirror ("my_probe", ":top.level_1.level_2.sigout_1"); // sigout_1 is a VHDL signal
always @(posedge my_probe)
$display("my_probe asserted high at time: %d", $time) ; top_vhdl_level.vhdl_level_2.vhdl_level_3.verilog_module.t_write() ; // t_write() is task inside verilog module