Verilog HDL: Bidirectional Pin
This example implements a clocked bidirectional pin in Verilog HDL. The value of OE determines whether bidir is an input, feeding in inp, or a tri-state, driving out the value b.
For more information on using this example in your project, go to:
bidir.v
module bidirec (oe, clk, inp, outp, bidir);
// Port Declaration
input oe;
input clk;
input [7:0] inp;
output [7:0] outp;
inout [7:0] bidir;
reg [7:0] a;
reg [7:0] b;
assign bidir = oe ? a : 8'bZ ;
assign outp = b;
// Always Construct
always @ (posedge clk)
begin
b <= bidir;
a <= inp;
end
endmodule
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These design examples may only be used within Altera Corporation devices and remain the property of Altera. They are being provided on an “as-is” basis and as an accommodation; therefore, all warranties, representations, or guarantees of any kind (whether express, implied, or statutory) including, without limitation, warranties of merchantability, non-infringement, or fitness for a particular purpose, are specifically disclaimed. Altera expressly does not recommend, suggest, or require that these examples be used in combination with any other product not provided by Altera.
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