Digital Circuit Design

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Hi Guys, really need your help. I try to figure out what should be use to satisfy the requirement. Counter, Multiplex, adder ?

You can always start with a flowchart to map out the process. The problem has to be broken into steps before you can really begin assembling hardware. This is a link to a free trial - http://www.smartdraw.com/specials/flowchart.asp

anyone could help

What are the hardware requirements? What are you allowed to use?

any person could throw some light please

any person has any idea please

any help please

u can use a 3 to 8 decoder for seven segment display.
for selecting dip use a2to4 decoder.
"If the previous selection was ’11’, the price of item ‘10’ is discounted to S$1 and price of item ‘11’ is discounted to S$2." for this use 2 and gates
one common i/p to 2 and gates (11 i/p).
other 2 i/ps are from 11 and 10 i/p's to the and gates.

Use a latch to hold the selection.

You could look up the concept of a state machine to help with your design.

It's about time for you to show us some attempts. From the conditions of use:

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You're not using logic elements yet. For instance, how do you signal the logic that there is an input to service? You say "push", but push what?

Do you have any reference material? You can use 74XX logic, but do you know the functions of the IC's? Can you latch an input into a flip flop?

The answer may be using the mod counter's presets...haven"t thought it all the way through, but it seems there could be a way to check for discount.

A worthwhile project would be to draw up a schematic applying the input selection switches to the logic and latching the value into the register.