COMPUTER SYSTEMS&MOD MSGT/ET SA AC PKG
COMPUTER SYSTEMS&MOD MSGT/ET SA AC PKG
3rd Edition
ISBN: 9780134671123
Author: Bryant
Publisher: PEARSON
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Chapter 4.5, Problem 4.31PP
Program Plan Intro

Processing stages:

  • The processing of an instruction has number of operations.
  • The operations are organized into particular sequence of stages.
  • It attempts to follow a uniform sequence for all instructions.
  • The description of stages are shown below:
    • Fetch:
      • It uses program counter “PC” as memory address to read instruction bytes from memory.
      • The 4-bit portions “icode” and “ifun” of specifier byte is extracted from instruction.
      • It fetches “valC” that denotes an 8-byte constant.
      • It computes “valP” that denotes value of “PC” plus length of fetched instruction.
    • Decode:
      • The register file is been read with two operands.
      • It gives values “valA” and “valB” for operands.
      • It reads registers with instruction fields “rA” and “rB”.
    • Execute:
      • In this stage the ALU either performs required operation or increments and decrements stack pointer.
      • The resulting value is termed as “valE”.
      • The condition codes are evaluated and destination register is updated centered on condition.
      • It determines whether branch should be utlised in a jump instruction.
    • Memory:
      • The memory is been written with data and is been read in this stage.
      •  The value that is read is determined as “valM”.
    • Write back:
      • The results are been written to register file.
      • It can write up to two results.
    • PC update:
      • The program counter “PC” denotes memory address to read bytes of instruction from memory.
      • It is used to set next instruction’s address.

Combinational circuits and HCL expressions:

  • The computational blocks are been constructed by accumulating several logic gates into network.
  • The restrictions are been shown below:
    • Each of input for logic gate should be connected to any one shown below:
      • One of system inputs, that is identified as primary inputs.
      • Output connection for some element in memory.
      • Output of some logic gate.
    • Outputs obtained from more than two logic gates could not be linked together.
      • The wire would be driven to different voltages.
      • It can cause malfunction in circuit.
    • The network should not contain cycles.
      • The loops in circuit can cause ambiguity in function computed by network.
  • The “HCL” denotes a hardware control language that is used for describing control logic of different processor designs.

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Chapter 4 Solutions

COMPUTER SYSTEMS&MOD MSGT/ET SA AC PKG

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