design a circuit

hi, u can try this: a minimal hardware system solution for this can be as follows: 1.Design a memory device that performs a LUT(Look Up Table conversion. the memory functionality can be achieved using a PROM, EPROM, FLASH etc. 2. The LUT provides the encryption operation which can be programmed in the memory using a standard programmer. 3. The data in bus to the memory will act the address for the memory location. the datain will hold the hexadecimal input. the content of the memory location with that address will hold the binary equivalent of the hexadecimal. 4.The control signals like CS and RD will be generated using combinatorial logic from the clock.

hai venkat its not an encoder ,if we give 56 as hexdecimal input and ouput becomes binary number 1010110 . i don't know how to design this digital circuit,can any one help me thanku in advance bye

hi hapi, u mean an encoder .its easy.just assign the switches and find out for the lines that are logic 1 or 0 for all cases and get a sop or pos and design the ckt. bye

you can first think about how the hexadecimal number to become to binary(algorithm), then you can build your fix model for hardware implementation.then write your VHDL code for it and synthesis your circuit.