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CPU Design Methodology || Computer Architecture Tutorial || Fresher Side




Data- Path Design:- Capabilities and performance characters of principals functions units(FU's).

Example:- Registers, ALU, Shifters, Logic Units, etc.

Data-path design is the way in which these components are interconnected.

Example:- Buses connections, Multiplexers, etc.

It describes how information flows between components.


Control-Path Design:- It describes logic & means by which such information flow is controlled.

It also tells control & coordination of FUs.

-> Design methodology depends both upon data-path & control-path design.

-> It also depends on CPU execution time & inturn CPI(Clock per instruction)

-> If CPI=1, CPU will be RISC CPU i.e single cycle execution of each instruction as MIPS(Millions of instruction per second) machine or Load/Store architecture.

-> If CPI>1, CPU will be CISC CPU as Intel's 8085/8086 & so on.

-> If CPI<1, CPU will be advanced processor like vector array,

RISC Design:- It is single cycle processor.

(i) It is faster, but difficult to design.

(ii) Advantage:- one clock per instruction.

(iii) Disadvantage:- long cycle time.

(iv) It is based on hardwired architecture.


CISC Design:- It is multiple cycle processor.

(i) It is slower, but simple to implement.

(ii) It is based on micro-programming design style & flexible in nature.

(iii) It has short cycle time.

Design is described in terms of components and how they have been assembled.




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