CSE 278 Lecture Notes - Lecture 18: Program Counter, Addressing Mode, Peripheral
12 Nov 2018
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Document Summary
Cpu is complicated, but its operations can be outlined in iterative sequence called instruction cycle. Abbreviations are for our use, and not all instructions require wb. Besides memory locations and several registers, the following registers are needed. Cpu cycles is the minimum time in which the cpu can do something, the memory cycle is the minimum time it can retrieve something from memory. Instructions can be classified by addressing mode and memory access. Processor-memory: transfer data between processor and memory. Processor-i/o: data transferred to or from a peripheral device. Data: involving only registers and floating or integer operations. Instructions fetched from memory (or cache) one at a time and placed in ir. Every time something is retrieved from memory, processor executes a memory cycle, which cached instructions seek to avoid. An instruction: opcode + operands may be several bytes long. Here we see advantages of 64 bit architectures.
