Assume that one 32-bit and two 16-bit microprocessors are to be interfaced to a system bus. The following details are given: 1. All microprocessors have the hardware features necessary for any type of data transfer: programmed I/O, interrupt-driven IO, and DMA. 2. All microprocessors have a 16-bit address bus. 3. Two memory boards, each of 128 KBytes capacity, are interfaced with the bus. The designer wishes to use a shared memory that

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Assume that one 32-bit and two 16-bit microprocessors are to be interfaced to a system bus. The following details are given: 1. All microprocessors have the hardware features necessary for any type of data transfer: programmed I/O, interrupt-driven IO, and DMA. 2. All microprocessors have a 16-bit address bus. 3. Two memory boards, each of 128 KBytes capacity, are interfaced with the bus. The designer wishes to use a shared memory that is as large as possible. 4. The system bus supports a maximum of four interrupt lines and one DMA line. Make any other assumptions necessary, and do the following:a. Give the system bus specifications in terms of number and types of lines. Describe a possible protocol for communicating on the bus (i.e., read-write, interrupt, and DMA sequences). Explain how the aforementioned devices are interfaced to the system bus.
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