Altera Designing With Low-Level Primitives - Manual (Page 12)

1–6 Altera Corporation
Designing with Low-Level Primitives User Guide April 2007
Low-Level Primitive Examples
Figure 1–2. LCELL Primitive Instantiations
Using I/Os
With I/O primitives, you can make I/O assignments in your HDL file
instead of making them through the Assignment Editor in the Quartus II
software.
Example 1–4 describes how to make an I/O standard
assignment to an input pin using the ALT_INBUF primitive in Verilog
HDL.
Example 1–4. Making an I/O Standard Assignment to an Input Pin Using the ALT_INBUF Primitive, Verilog
module io_primitives (data_in, data_out);
input data_in;
wire internal_sig;
output data_out;
alt_inbuf my_inbuf (.i(data_in), .o(internal_sig));
defparam my_inbuf.io_standard="1.8 V HSTL Class I";
assign data_out = !internal_sig;
endmodule