program for a calculator

Hi Javier,

I found an example related to Implementation of a 4-bit Adder with

7-segment HDL decoder using VHDL in the link below. Probably can give you some ideas. Most of time, decoder is used for seven segment display and in case you work with VHDL, you can use the "WITH-SELECT-WHEN".

http://www.pldworld.com/_hdl/2/-seas.upenn.edu/_ese201/lab/Lab4bAddDec/Lab4bAddDecF01.html

Thanks,

Regards