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ECE 5465 Chapter 1 of text

ECE 5465 Chapter 1 of text. Outline. Design abstraction MU0 Instruction set design. In the beginning …. The dawn of the modern era started with the stored program computer ….. Much yet to be written

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ECE 5465 Chapter 1 of text

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  1. ECE 5465Chapter 1 of text Lecture 1 - Introduction

  2. Outline • Design abstraction • MU0 • Instruction set design Lecture 1 - Introduction

  3. In the beginning …. • The dawn of the modern era started with the stored program computer ….. • Much yet to be written • All stored program computers operate on the same core principals. The start of the execution of any instructions begins : • Mem(PC)  IR Lecture 1 - Introduction

  4. Modern design • All modern designs are done using design abstraction. • The abstraction level description ends up as transistors on an ic after translation by multiple CAD tools. • There are various dimension to abstraction. • The hardware dimension • The HDL dimension • The power dimension Lecture 1 - Introduction

  5. MU0 • MU0 is much like MicroBaby, an accumulator architecture • MU0 instruction set is simpler than the MicroBaby instruction set. It only has Load, Store, Add, and Subtract, and two conditional jumps. • It has 16-bit data and address versus just the 8-bit of MicroBaby, so it has 64K bytes of main memory. Lecture 1 - Introduction

  6. MU0 Structure • The datapath and instructions Lecture 1 - Introduction

  7. MU0 datapath detail • A more detailed view of the architecture Lecture 1 - Introduction

  8. The MU0 instruction bits • Instruction encoding – ref text Lecture 1 - Introduction

  9. Instruction set design • Instruction set design involves choosing the binary encoding of each instruction • Best to choose one where the instruction word is broken into fields, with each field having a specific meaning or purpose. • Then, what goes into what happens on the busses during each cycle of execution. • Here we can further study MicroBaby and the timing of all the control signals. Lecture 1 - Introduction

  10. Then RISC was discussed • The reference for the paper that started it all is given. (for RISC on page 24) “The Case for the Reduced Instruction Set Computer” • Core elements of “pure” RISC (see pg 24) • Fixed instruction size • Load/Store • Large Register Bank • RISC advantages • Small die size / shorter development time / higher performance • RISC drawbacks • Poor code density • No x86 compatibility – no IBM PC compatibility • ARMs answer for code density – the THUMB architecture Lecture 1 - Introduction

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