Connecting inout signal to out.


P

pallav

I have a tool that generated the following code for a nand2 schematic
(static CMOS) in VHDL. When I compile it (GHDL), I get errors
indicating that I'm trying to connect an inout port to an out port.
Can some tell me how I can resolve this error without making y an
'inout' port. Thanks for any help.

x.vhd:21:41: cannot associate inout signal interface "d" with actual
port of mode out
x.vhd:22:33: cannot associate inout signal interface "s" with actual
port of mode out
x.vhd:23:33: cannot associate inout signal interface "s" with actual
port of mode out

-- VHDL automatically generated by Electric 8.06 for cell 'nand2{sch}'
entity nand2 is port(a, b: in BIT; y: out BIT);
end nand2;

architecture nand2_BODY of nand2 is
component ground port(gnd: out BIT);
end component;
component nMOStran port(g: in BIT; s, d: inout BIT);
end component;
component PMOStran port(g: in BIT; s, d: inout BIT);
end component;
component power port(vdd: out BIT);
end component;

signal gnd, vdd, net_52: BIT;

begin
gnd_1: ground port map(gnd);
nmos_3: nMOStran port map(b, gnd, net_52);
nmos_4: nMOStran port map(a, net_52, y); <-- signal y
pmos_2: PMOStran port map(a, y, vdd); <-- signal y
pmos_3: PMOStran port map(b, y, vdd); <-- signal y
pwr_0: power port map(vdd);
end nand2_BODY;
 
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P

pallav

I have a tool that generated the following code for a nand2 schematic
(static CMOS) in VHDL. When I compile it (GHDL), I get errors
indicating that I'm trying to connect an inout port to an out port.
Can some tell me how I can resolve this error without making y an
'inout' port. Thanks for any help.

x.vhd:21:41: cannot associate inout signal interface "d" with actual
port of mode out
x.vhd:22:33: cannot associate inout signal interface "s" with actual
port of mode out
x.vhd:23:33: cannot associate inout signal interface "s" with actual
port of mode out

-- VHDL automatically generated by Electric 8.06 for cell 'nand2{sch}'
entity nand2 is port(a, b: in BIT; y: out BIT);
  end nand2;

architecture nand2_BODY of nand2 is
  component ground port(gnd: out BIT);
    end component;
  component nMOStran port(g: in BIT; s, d: inout BIT);
    end component;
  component PMOStran port(g: in BIT; s, d: inout BIT);
    end component;
  component power port(vdd: out BIT);
    end component;

  signal gnd, vdd, net_52: BIT;

begin
  gnd_1: ground port map(gnd);
  nmos_3: nMOStran port map(b, gnd, net_52);
  nmos_4: nMOStran port map(a, net_52, y); <-- signal y
  pmos_2: PMOStran port map(a, y, vdd);  <-- signal y
  pmos_3: PMOStran port map(b, y, vdd); <-- signal y
  pwr_0: power port map(vdd);
end nand2_BOD

Actually, a follow-up question. Does VHDL have nmos/pmos transistor
definitions like Verilog does?
I haven't been able to find anything on the VHDL reference cards. I'm
wondering if nMOStran/PMOStran are pre-defined in VHDL or part of some
package? If not, then perhaps the above question is not of importance
as it might be a peculiarity of the tool that I'm using. Will look
into its documentation.
 
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P

pallav

Actually, a follow-up question. Does VHDL have nmos/pmos transistor
definitions like Verilog does?
I haven't been able to find anything on the VHDL reference cards. I'm
wondering if nMOStran/PMOStran are pre-defined in VHDL or part of some
package? If not, then perhaps the above question is not of importance
as it might be a peculiarity of the tool that I'm using. Will look
into its documentation.

Please ignore the above OP. Its not relevant anymore.
 

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