Task 1
The Control Unit
There are two types of control unit which are hardwired and micro program where hardwired are for fixed architecture and are typically RISC and cost more than micro program because of the time required to design the circuits , but they are faster. Micro program control units are slower than hardwired but are easier and cheaper to implement as the instructions are stored in special control memory. The control unit controls all data going in, out and inside the CPU. The control unit decodes the data from ram and turns it into an instruction depending on what instruction set the control unit is programed or hardwired to have. Then if the instruction involves any logic or mathamatical caluculations it gets sent to the alu where it gets calculated and outpeted to the accumulator.
The ALU The ALU is an acronym for arithmetic and logic unit, this is one of the most important parts of the CPU as it does all of the calculations. The ALU is a big array of different logic gates that are interconnected to preform basic logical and mathematical operation such as putting adding numbers or xoring two values. How the ALU is designed makes a big difference in terms of how powerful the processor will be as the more complicated …show more content…
Once the instruction from the device has completed the CPU will pick back up where it left off by loading the instructions back from the stack. When an interrupt is send the device must send some code which tells the cpu how to handle its needs this is called an interrrupt hander. Every device which is cababable of sending a interrupt needs to have its own uniqe interrupt hander which is loaded into ram during