Using LogiSim do the following:

Design a 8-bit Adder/Subtractor

Draw its schematic diagram (concept)

Design the logic circuit

Simulate the circuit

Test it & screen shot your results

in a word document write containing (numbers 2-5)

with the .circ file

Requirements and hints

Must have a selector/control line (1-bit wide) to control add or sub operation.

Use 1-bit full adders as a black box component then import it and use it as many times as required.

Must save each result in a (8x8) RAM component using a 3-bit address

RAM demo will be given in class.

Important note: you need a clock line for RAM trigger instead of manually toggling the enable/disable state MUST have simulate & ticks enabled.