unable to understand code in vhdl please help

[s3034585]

hi guys
i am trying to understand a code segment in a vhdl example program
can any one please explain the exact operation of these lines

for i in 0 to 15 loop
Reference( 128-1)<= Reference_Temp(128-1) xor Result(i) ;
Mask ( Ks_Width-1)<= Mask_temp ( Ks_Width-1) and Reference( 128-1);

Comparison_Result_Temp(i) <= Comparison_Result_Temp(i) or ( Mask_Temp(128-1) and ( Reference_Temp(128-1) xor Result(i) ) );

end loop;

in this for loop i am not able to understad the xor operation as result is one bit and it is being xored with a 128 bit array. so my question is that wether this single bit is xored with all the 128 bits or just a single bit


please help
thank
tama

 

[s_vlsi]

I think it will be xored with all the bits.

:|

Added after 2 minutes:



I think it will be xored with all the bits.

:|

 

[tkbits]

Are you sure that is (128-1) and (KsWidth-1) instead of (128-i) and (KsWidth-i)?

As written, Reference_Temp(128-1) is a single bit, not a bit vector. A bit vector slice would be written as Reference_Temp(128 downto 1).

 

[kangta]

I think it was confusion on 1 or i.....
you should try again with 1 replaced by i