ALTFP_CONVERT in Modelsim

You are not showing the output port of the altfp_convert megafunction. I don't think, that the output of altfp_convert is tri-stateable, apparently it's sourced from a register.

It's also not clear, if the warning is generated during processing of the MegaFunction or other parts of your design.

Thank you for your reply.

The section of my testbench for stimulating the convertor:

--- Quote Start ---

//Convert signals

logic convert_rst;

logic convert_en;

logic[9:0] in;

logic [31:0] out;

//Module

fpconvert converter(convert_rst,CLOCK_50,convert_en,in,out);

//Convert Signals

initial

begin

convert_rst = 1'b0;

convert_en = 1'b0;

in = 10'b0000000001;

# 50ns;

convert_rst = 1'b0;

convert_en = 1'b1;

in = 10'b0000100001;

# 50ns;

convert_rst = 1'b0;

convert_en = 1'b1;

in = 10'b0000100001;

# 50ns;

convert_rst = 1'b0;

convert_en = 1'b1;

in = 10'b0000100001;

# 50ns;

convert_rst = 1'b0;

convert_en = 1'b1;

in = 10'b0000100001;

# 50ns;

convert_rst = 1'b0;

convert_en = 1'b1;

in = 10'b0000100001;

# 50ns;

convert_rst = 1'b0;

convert_en = 1'b1;

in = 10'b0000100001;

# 50ns;

convert_rst = 1'b0;

convert_en = 1'b1;

in = 10'b0000100001;

end

--- Quote End ---

As you can see, it is the megafunction output port which is high Z.

I tried simulating without the 'mains' module (which is my entire design) which removed the 'Non-positive replication multiplier inside concat' error. So from what I can tell, it's a either an issue with the Megafunction or Modelsim.

Problem solved. I made a new copy of ALTFP_CONVERT with a different name and that seemed to fix it. Surprising how changing the name of a module seems to fix things... I have a feeling I may have made an incorrect port assignment in another module, which messed up the synthesis of ALTFP_CONVERT when I tried testing it by itself in modelsim.

Thank you for your help :)