Tulu1 - Module No 3 Lecture No 14 Hardware architecture of 8086 and 8088 Microprocessors Objective To examine the 8086 and 8088 microprocessors in

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Module No 3 Lecture No 14 Hardware architecture of 8086 and 8088 Microprocessors Objective: - To examine the 8086 and 8088 microprocessors in terms of hardware point of view - To introduce the operating modes and functions of signals Generated/accepted by 8086 and 8088 microprocessors Slide 1: The hardware architecture of 8086 and 8088 processors: - The microprocessors 8086 and 8088 were both made of HMOS technology with an IC circuitry equivalent to 29000 transistors. ( HMOS: high performance metal oxide semiconductor ) - Unlike the software model, the hardware architecture of 8088 microprocessor is different from that of 8086 (Talk only: As 8086 has 16-bit data bus and 8088 has 8-bit data bus as will be demonstrate in Slides 4 and 5) - Both processors are housed in a 40-pin dual in-line package, with many of the pins having multiple fictions or Multiplexed.
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Slide 2: The Modes of Operation: - The microprocessors 8086 and 8088 can be configured to work in two modes: The Minimum mode and the Maximum mode. - The Minimum mode is used for single processor system, where 8086/8088 directly generates all the necessary control signals. - The Maximum mode is designed for multiprocessor systems, where an additional “Bus-controller” IC is required to generate the control signals. The processors control the Bus-controller using status-codes. 8284A Clock generator GND CLK READY RESET MN/MX Address/Data Bus and BHE BHE, A 0 -A 19 D 0 -D 7 CLK S 0 S 1 S 2 Bus Controller ALE MWTC MRD DT/R DEN 8088 Maximum Mode 8284A Clock generator Vcc CLK READY RESET 8088 Minimum Mode MN/MX IO/M Control Bus WR DT/R DEN ALE Address/Data Bus A 0 -A 19 RD D 0 -D 7
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Slide 3: Bus structure of 8086 based computer system: - A set of conductors, used for communicating information between the components in a computer system is called System-Bus. - Internal Bus: connects two minor components within a major component (or IC), such the connection between the control unit and internal registers of the MPU) - External Bus: connects two major components, such as MPU and an interface (Memory or input/output). Although some systems include more than one external bus, 8086 and 8088 processors contain one bus called system-bus.
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This note was uploaded on 06/08/2009 for the course EENG 410 taught by Professor Elenidesta during the Three '09 term at University of Adelaide.

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Tulu1 - Module No 3 Lecture No 14 Hardware architecture of 8086 and 8088 Microprocessors Objective To examine the 8086 and 8088 microprocessors in

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