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Design Languages >> Verilog-AMS >> Netlisting failed with multiple Verilog-A blocks
https://designers-guide.org/forum/YaBB.pl?num=1452610178

Message started by yong_rfic on Jan 12^th, 2016, 6:49am

Title: Netlisting failed with multiple Verilog-A blocks
Post by yong_rfic on Jan 12^th, 2016, 6:49am

Hello,

I have encountered netlist errors when trying to simulate circuit which has two simple Verilog-A blocks. Each individual block can be nestlisted successfully. However when I put them in the same schematic, there are errors. The error messages are:

"ERROR (OSSHNL-524): Netlisting failed as function hnlNetNameOnTerm was called with a non-existent terminal name on current instance 'I1' in design 'RF14/cal_logic_decod/schematic'. Ensure that argument to this function is a valid terminal name and netlist again.\n\n"
and many more of the same thing...

The two verilog-a blocks are defined like

module A(B_in, T_out);

input [4:0] B_in ;
electrical [4:0] B_in ;
output [15:0] T_out ;
electrical [15:0] T_out ;

endmodule

module B(clk, vin, vout);

input vin, clk;
output [4:0] vout;
electrical vin, clk;
electrical [4:0] vout;

endmodule

Please advise, thank you.

Title: Re: Netlisting failed with multiple Verilog-A blocks
Post by Geoffrey_Coram on Jan 14^th, 2016, 5:14am

I suspect there is something subtle in your set-up that's causing trouble, and it may be something related to the actual definitions of your blocks. (I think your modules aren't actually "module A" and "module B")

I assume each block has a symbol view and a verilog-a view.

I would try replacing one of the blocks with a simple verilog-a module, maybe something as simple as a resistor or a voltage source. Or try it with a voltage source and a resistor as your two verilog-a blocks, and make sure you can netlist a schematic with those two simple blocks. Then work up from there.

Title: Re: Netlisting failed with multiple Verilog-A blocks
Post by yong_rfic on Jan 14^th, 2016, 7:14am

Thank you for the useful advice. I ended up combining the two modules into a single one. Problem solved at least for now.

Title: Re: Netlisting failed with multiple Verilog-A blocks
Post by andrew terry on Jan 31^st, 2018, 2:50pm

I had the same error. To fix I instantiate the second block fresh with create instance (i). Do not copy from the first instance.