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-   Loop  statements  can  be constructed for any repetitive  operation.  There  are  different  forms,  each   having   a  different   method    of  control.    We  shall  examine  the ¡°for  loop¡±.
The loop variable Index is not  declared,   and  is  not  visible outside the loop.  It is treated as a constant.
With each loop iteration, it   successively assumes the discrete  values  indicated  in the range. 
process  ( A, B_bus )  begin for  I in 0 to 7  loop      C_bus (I) <= A  and  B_bus (I) ; end  loop ;