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The most common type of non-volatile memory is the ROM device. This device is read only and the data is masked into the chip during manufacture. Variations of the ROM are one off programmable ones (PROM), erasable ones (EPROM) using UV light, electrical erasable ones (EEPROM). These devices allow the user to blow them with programs and re-program if incorrect. As engineers we will often use the EPROM version, the pinning details are shown below
The internal structure of the EPROM is similar the SRAM, but does not require a write pin; it employs light sensitive fuses to hold the data.
The actual device has a window in it, this enables the device to be cleaned using UV light, usually this window is covered up to prevent slow eraser by normal light.
Preparation of writing the program 1. Write an algorithm for your program closer to assembly language. For instance the algorithm for preceding program will be: get NUM1
Q. Write short note on Interfacing Keyboard, giving block diagram. Why do we need to introduce circuitry called Keyboard Status Word Generator?
Q. Basic Tradeoff of concerns for instruction set design? Basic Tradeoff: Smaller instruction (less space) vs. desire for more powerful instruction repertoire. Generally p
Use as few gates as possible, design a NAND-to-AND gate network that realize the following Boolean algebra expression. A'BC'D + ABC'D' + A'B'CD' + AB'C'D'
what are the steps to implement bus topology?
hidden edge/surface removal
What are prefetch instructions? Prefetch instructions are those instructions which can be inserted into a program either by the programmer or by the compiler.
state function and path function
Explain the operation of 8:1 multiplexer. Ans: In this multiplexer 8 Input and 1 Output and three select lines i.e. S 2 , S 1 , S 0 are given. Any one of the inputs will be
Create a relationship among Employee and Sales tables using Emp No. Enforce referential integrity and select both cascade update and cascade delete options. Save the relationship.
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