FIT1047 Final: Constructing a CPU
31 May 2018
School
Department
Course
Professor
Constructing a CPU
Saturday, 26 May 2018
4:44 PM
Arithmetic Logic Unit (ALU)
• Combinational Circuit
• MARIE
o Addition of 2 numbers (Add and Add I)
o Subtraction of 2 numbers (Subt and Subt I)
o Incrementing a number by 1 (Incrementing PC register)
o Testing if number is less than, greater than or equal to 0 (Skipcond)
• Two n-bit data inputs required
Register File
• Collects all the registers into a single circuit, and it enables the CU to select one of the registers
for reading and another one for writing at any one time.
• One n-bit data
Control Unit
• Main task is fetch-decode-execute cycle
• Keeps track of time through clocks and cycle counters
Clocks and Cycle counters
• Usual measure of time in a CPU is a clock cycle, as determined by the system clock, which
generates an oscillating signal
• Special wire in CPU continuously changes from 0 to 1 and back to 0 within a fixed frequency
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Document Summary
Arithmetic logic unit (alu: combinational circuit, marie, addition of 2 numbers (add and add i, subtraction of 2 numbers (subt and subt i) Incrementing a number by 1 (incrementing pc register: testing if number is less than, greater than or equal to 0 (skipcond, two n-bit data inputs required. Register file: collects all the registers into a single circuit, and it enables the cu to select one of the registers for reading and another one for writing at any one time, one n-bit data. Control unit: main task is fetch-decode-execute cycle, keeps track of time through clocks and cycle counters. Clocks and cycle counters: usual measure of time in a cpu is a clock cycle, as determined by the system clock, which generates an oscillating signal.
