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计算机组成原理英文版课件:6-Datapath.pdf
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计算机组成原理英文版课件:6-Datapath.pdf
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Kai Huang
Single Cycle Processor Design
4/4/2014 Kai.Huang@SYSU 2
Rise of the robots
Mar 29th 2014
http://www.economist.com/printedition/2014-03-29
4/4/2014 Kai.Huang@SYSU 3
Outline
Designing a Processor: Step-by-Step
Datapath Components and Clocking
Assembling an Adequate Datapath
Controlling the Execution of Instructions
The Main Controller and ALU Controller
Drawback of the single-cycle processor design
4/4/2014 Kai.Huang@SYSU 4
Recall, performance is determined by:
o Instruction count
o Clock cycles per instruction (CPI)
o Clock cycle time (CT)
Processor design will affect
o Clock cycles per instruction
o Clock cycle time
Single cycle datapath and control design:
o Advantage: One clock cycle per instruction
o Disadvantage: long cycle time
The Performance Perspective
I-Count
CPI CT
4/4/2014 Kai.Huang@SYSU 5
Designing a Processor: Step-by-Step
Analyze instruction set => datapath requirements
o The meaning of each instruction is given by the register transfers
o Datapath must include storage elements for ISA registers
o Datapath must support each register transfer
Select datapath components and clocking methodology
Assemble datapath meeting the requirements
Analyze implementation of each instruction
o Determine the setting of control signals for register transfer
Assemble the control logic
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