Modelsim altera error

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Hi there,

I have quite a few inout ports on the top module. For them to be output, I have declare them as reg. But these ports give me "Illegal reference to net <..>" when I try to run simulation (compilation runs through with warnings).

Help please.

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Hi,

can you please post your code.

Kind regards

GPK

my bad.. sorry.

I have attached a portion of my code below; while running Modelsim Altera, I get the above error. Basically, based on the 4 bit dap_route code, I either loop-back some ports or route to outside CPLD (Max II).

module top_v (

//DAP1

inout wire dap1_fs,

inout wire dap1_sclk,

input dap1_dout, //input w.r.t CPLD

output wire dap1_din, //output w.r.t CPLD

//DAP2

inout wire dap2_fs,

inout wire dap2_sclk,

input dap2_dout,

output wire dap2_din,

//DAP3

inout wire dap3_fs,

inout wire dap3_sclk,

input dap3_dout,

output wire dap3_din,

input [3:0] dap_route

);

//Instantiating a module

dap_test_binary dap_call(

//DAP1

.dap1_fs(dap1_fs),

.dap1_sclk(dap1_sclk),

.dap1_dout(dap1_dout), //input w.r.t CPLD

.dap1_din(dap1_din), //output w.r.t CPLD

//DAP2

.dap2_fs(dap2_fs),

.dap2_sclk(dap2_sclk),

.dap2_dout(dap2_dout),

.dap2_din(dap2_din),

//DAP3

.dap3_fs(dap3_fs),

.dap3_sclk(dap3_sclk),

.dap3_dout(dap3_dout),

.dap3_din(dap3_din),

.dap_route(dap_route)

);

//Actual module

module dap_test_binary (

//DAP1

inout reg dap1_fs,

inout reg dap1_sclk,

input dap1_dout, //input w.r.t CPLD

output reg dap1_din, //output w.r.t CPLD

//DAP2

inout reg dap2_fs,

inout reg dap2_sclk,

input dap2_dout,

output reg dap2_din,

//DAP3

inout reg dap3_fs,

inout reg dap3_sclk,

input dap3_dout,

output reg dap3_din,

input [3:0] dap_route

);

always @ (*)

begin

case (dap_route)

4'b0000: begin //DAP1 (master) looped back to DAP2

dap1_din = dap2_dout;

dap2_din = dap1_dout;

dap2_fs = dap1_fs;

dap2_sclk = dap1_sclk;

end

4'b0001: begin //DAP2 (master) looped back to DAP1

dap1_din = dap2_dout;

dap2_din = dap1_dout;

dap1_fs = dap2_fs;

dap1_sclk = dap2_sclk;

end

4'b0010: begin //DAP1 (master) looped back to DAP3

dap1_din = dap3_dout;

dap3_din = dap1_dout;

dap3_fs = dap1_fs;

dap3_sclk = dap1_sclk;

end

4'b0011: begin //DAP3 (master) looped back to DAP1

dap1_din = dap3_dout;

dap3_din = dap1_dout;

dap1_fs = dap3_fs;

dap1_sclk = dap3_sclk;

end

default: begin

dap1_fs = 1'bz;

dap1_sclk = 1'bz;

dap1_din = 1'bz;

dap2_fs = 1'bz;

dap2_sclk = 1'bz;

dap2_din = 1'bz;

dap3_fs = 1'bz;

dap3_sclk = 1'bz;

dap3_din = 1'bz;

end

endcase

end

endmodule

//errors

* Error: C:/Verilog_stuff/Projects/MMSE/E1888/dap_test_binary.v(41): (vlog-2110) Illegal reference to net "dap2_fs".# ** Error: C:/Verilog_stuff/Projects/MMSE/E1888/dap_test_binary.v(42): (vlog-2110) Illegal reference to net "dap2_sclk".# ** Error: C:/Verilog_stuff/Projects/MMSE/E1888/dap_test_binary.v(4http://www.edaboard.com/images/smilies/icon_cool.gif : (vlog-2110) Illegal reference to net "dap1_fs".# ** Error: C:/Verilog_stuff/Projects/MMSE/E1888/dap_test_binary.v(49): (vlog-2110) Illegal reference to net "dap1_sclk".# ** Error: C:/Verilog_stuff/Projects/MMSE/E1888/dap_test_binary.v(56): (vlog-2110) Illegal reference to net "dap3_fs".# ** Error: C:/Verilog_stuff/Projects/MMSE/E1888/dap_test_binary.v(57): (vlog-2110) Illegal reference to net "dap3_sclk".

Thanks for your help.

regards

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my bad.. sorry.

I have attached a portion of my code below; while running Modelsim Altera, I get the above error. Basically, based on the 4 bit dap_route code, I either loop-back some ports or route to outside CPLD (Max II).

module top_v (

//DAP1

inout wire dap1_fs,

inout wire dap1_sclk,

input dap1_dout, //input w.r.t CPLD

output wire dap1_din, //output w.r.t CPLD

//DAP2

inout wire dap2_fs,

inout wire dap2_sclk,

input dap2_dout,

output wire dap2_din,

//DAP3

inout wire dap3_fs,

inout wire dap3_sclk,

input dap3_dout,

output wire dap3_din,

input [3:0] dap_route

);

//Instantiating a module

dap_test_binary dap_call(

//DAP1

.dap1_fs(dap1_fs),

.dap1_sclk(dap1_sclk),

.dap1_dout(dap1_dout), //input w.r.t CPLD

.dap1_din(dap1_din), //output w.r.t CPLD

//DAP2

.dap2_fs(dap2_fs),

.dap2_sclk(dap2_sclk),

.dap2_dout(dap2_dout),

.dap2_din(dap2_din),

//DAP3

.dap3_fs(dap3_fs),

.dap3_sclk(dap3_sclk),

.dap3_dout(dap3_dout),

.dap3_din(dap3_din),

.dap_route(dap_route)

);

//Actual module

module dap_test_binary (

//DAP1

inout reg dap1_fs,

inout reg dap1_sclk,

input dap1_dout, //input w.r.t CPLD

output reg dap1_din, //output w.r.t CPLD

//DAP2

inout reg dap2_fs,

inout reg dap2_sclk,

input dap2_dout,

output reg dap2_din,

//DAP3

inout reg dap3_fs,

inout reg dap3_sclk,

input dap3_dout,

output reg dap3_din,

input [3:0] dap_route

);

always @ (*)

begin

case (dap_route)

4'b0000: begin //DAP1 (master) looped back to DAP2

dap1_din = dap2_dout;

dap2_din = dap1_dout;

dap2_fs = dap1_fs;

dap2_sclk = dap1_sclk;

end

4'b0001: begin //DAP2 (master) looped back to DAP1

dap1_din = dap2_dout;

dap2_din = dap1_dout;

dap1_fs = dap2_fs;

dap1_sclk = dap2_sclk;

end

4'b0010: begin //DAP1 (master) looped back to DAP3

dap1_din = dap3_dout;

dap3_din = dap1_dout;

dap3_fs = dap1_fs;

dap3_sclk = dap1_sclk;

end

4'b0011: begin //DAP3 (master) looped back to DAP1

dap1_din = dap3_dout;

dap3_din = dap1_dout;

dap1_fs = dap3_fs;

dap1_sclk = dap3_sclk;

end

default: begin

dap1_fs = 1'bz;

dap1_sclk = 1'bz;

dap1_din = 1'bz;

dap2_fs = 1'bz;

dap2_sclk = 1'bz;

dap2_din = 1'bz;

dap3_fs = 1'bz;

dap3_sclk = 1'bz;

dap3_din = 1'bz;

end

endcase

end

endmodule

//errors

* Error: C:/Verilog_stuff/Projects/MMSE/E1888/dap_test_binary.v(41): (vlog-2110) Illegal reference to net "dap2_fs".

# ** Error: C:/Verilog_stuff/Projects/MMSE/E1888/dap_test_binary.v(42): (vlog-2110) Illegal reference to net "dap2_sclk".

# ** Error: C:/Verilog_stuff/Projects/MMSE/E1888/dap_test_binary.v(4http://www.edaboard.com/images/smilies/icon_cool.gif : (vlog-2110) Illegal reference to net "dap1_fs".

# ** Error: C:/Verilog_stuff/Projects/MMSE/E1888/dap_test_binary.v(49): (vlog-2110) Illegal reference to net "dap1_sclk".

# ** Error: C:/Verilog_stuff/Projects/MMSE/E1888/dap_test_binary.v(56): (vlog-2110) Illegal reference to net "dap3_fs".

# ** Error: C:/Verilog_stuff/Projects/MMSE/E1888/dap_test_binary.v(57): (vlog-2110) Illegal reference to net "dap3_sclk".

Thanks for your help.

regards

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Hi,

sorry I did not saw it is Modelsim related. At least Quartus could compile the code without an error. I will test the code with modelsim now.

Kind regards

GPK

Looks like it might be an issue with my flawed implementation of bidirectional ports. Help would be appreciated.

Thanks