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What is Read only memory (ROM) and Define the Use of it?
A simple kind of ROM can be constructed from a decoder, Or gates, and a number of wires.
Input Fuses Output
The Rom is used to implement complex combinational circuit within an IC or used as a memory device. The information is specified through the designer and embedded in the unit, to from the required information.
It consists of n inputs line every bit combination of input variables called as address. Every bit combination of the o/p is called as word and the no. of bits/word= The no. of o/p lines.
Consider ea 32X 8 ROM it consists of 32 words. Every has 8 bits.
ROM is able to be used to implement complex combinational circuit within a unit.
Illustration Design the combinational circuit using a ROM and The circuit accepts 3 bit no and generates an output binary no equal to the square of the input no.
Explain MDR and MAR. The data and address lines of the external memory bus linked to the internal processor bus by the memory data register, MDR and the memory address register
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