Consider a computer system that contains an I/O module controlling a simple keyboard/printer teletype. The following registers are contained in the processor and connected directly to the system bus: INPR: Input register – 8 bits OUTR: Output register – 8 bits FGI: Input flag – 1 bit FGO: Output flag – 1 bit IEN: Interrupt enable – 1 bit Keystroke input from the teletype and printer output to the teletype are controlled by the I/O module. The teletype is able to encode an alphanumeric symbol to an 8-bit word and decode an 8-bit word into an alphanumeric symbol. Describe how the processor, using the first four registers listed in the problem can achieve I/O with the teletype. Describe how the function can be performed more efficiently by also employing IEN.

Consider a computer system that contains an I/O module controlling a simple keyboard/printer teletype. The following registers are contained in the processor and connected directly to the system bus: INPR: Input register – 8 bits OUTR: Output register – 8 bits FGI: Input flag – 1 bit FGO: Output flag – 1 bit IEN: Interrupt enable – 1 bit Keystroke input from the teletype and printer output to the teletype are controlled by the I/O module. The teletype is able to encode an alphanumeric symbol to an 8-bit word and decode an 8-bit word into an alphanumeric symbol. Describe how the processor, using the first four registers listed in the problem can achieve I/O with the teletype. Describe how the function can be performed more efficiently by also employing IEN.

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter4: Processor Technology And Architecture

Section: Chapter Questions

Problem 2PE: If a microprocessor has a cycle time of 0.5 nanoseconds, what’s the processor clock rate? If the...

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Question

Consider a computer system that contains an I/O module controlling a simple keyboard/printer teletype. The following registers are contained in the processor and connected directly to the system bus:

INPR: Input register – 8 bits

OUTR: Output register – 8 bits

FGI: Input flag – 1 bit

FGO: Output flag – 1 bit

IEN: Interrupt enable – 1 bit

Keystroke input from the teletype and printer output to the teletype are controlled by the I/O module. The teletype is able to encode an alphanumeric symbol to an 8-bit word and decode an 8-bit word into an alphanumeric symbol.

Describe how the processor, using the first four registers listed in the problem can achieve I/O with the teletype.

Describe how the function can be performed more efficiently by also employing IEN.

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