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Altera_Forum's avatar
Altera_Forum
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14 years ago

Tri-state fanout converted to OR gate

Hi, I'm writing Verilog code for an I2C expander with bidirectional 16-bit output. If I need to read the status of the pins into a register, which means I the tr-state output pins are conn...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

My bidirectional primitive is

module bidir_io (

input wire in,

input wire oe,

output out,

inout wire io

);

assign io = oe ? in : 1'bz;

assign out = io;

endmodule

I only use the 'out' to sense any changes to 'io' pin. So I'm not sure why the error points to 'io'.