http://en.wikipedia.org/wiki/Sign_extension
On 03/13/2011 07:47 PM, Alaa Salaheldin wrote:
> Can anyone please help me to understand what's going on in sign_extend.v ,
> this macro is initiated in the cic_decim.v
>
> sign_extend #(bw,bw+maxbitgain)
> ext_input (.in(signal_in),.out(signal_in_ext));
>
>
> when i opened the macro i couldn't understand it's function
>
> // Sign extension "macro"
> // bits_out should be greater than bits_in
>
> module sign_extend (in,out);
> parameter bits_in=0; // FIXME Quartus insists on a default
> parameter bits_out=0;
> input [bits_in-1:0] in;
> output [bits_out-1:0] out;
> assign out = {{(bits_out-bits_in){in[bits_in-1]}},in};
> endmodule
>
> Thanks in advance.
>
>
>
>
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