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Lecture 1: Course introduction - page 10 / 15

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System buses

Address Bus Carries the location in memory of a given item Uni-directional (always supplied by the CPU) Determines maximum amount of memory available to CPU

Data bus Carries data between CPU and memory or I/O devices Bi-directional Determines the width of the architecture

Control Bus

Carries timing signals (and more) to synchronize CPU to external circuitry

Highly dependent on the specific CPU

Microprocessor-based System Design Ricardo Gutierrez-Osuna Wright State University

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