Question

Assume that one 16-bit and two 8-bit microprocessors are to be interfaced to a system bus. The following details are given:
All microprocessors have the hardware features necessary for any type of data transfer: programmed I/O, interrupt-driven I/O, and DMA.
All microprocessors have a 16-bit address bus.
Two memory boards, each of 64-Kbytes capacity, are interfaced with the bus. The designer wishes to use a shared memory that is as large as possible.
The system bus supports a maximum of four interrupt lines and one DMA line. Make any other assumptions necessary, and
a. Give the system bus specifications in terms of number and types of lines. [6]
b. Describe a possible protocol for communicating on the bus (i.e., read-write, interrupt, and DMA sequences). [6]
c. Explain how the aforementioned devices are interfaced to the system bus. [8]

Answer 1

Answer:

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