I have no idea about this question. Please solve this question. Below Figure 12-

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I have no idea about this question.

Please solve this question.

Below Figure 12-46 shows a simple circuit for manually programming a 2732 EPROM. Each EPROM data pin is connected to a switch that can be set at a 1 or a 0 level. The address inputs are driven by a 12-bit counter. The 50-ms programming pulse comes from a one-shot each time the PROGRAM push button is actuated. (a) Explain how this circuit can be used to program the EPROM memory locations sequentially with the desired data. (b) Show how 74293s and a 74121 can be used to implement this circuit. (c) Should switch bounce have any effect on the circuit operation?

Explanation / Answer

a) Once the 12 bit counter is reset, it will point to the address 0x000. Basically, what the counter does is the selection of memory locations.

In order to program the memory locations of the EPROM, we need to set the data switches first. If the switch, say SW7 is set to 5V then upon programming the bit D7 will be set to 1. When SW7 is set to GND, D7 will become 0.Similarly, all the data switches will be set according to the desired data.

Then, the selected memory location while get programmed once the PROGRAM push button is pressed. The push button pulls the input of ONE SHOT circuit to ground. Since the circuit is active low, it will get activated and send an output of 50ms pulse. This pulse is fed directly to the CLK pin of the counter. Also, the pulse is inverted and fed to the CHIP ENABLE of the EPROM in order to enable the memory chip.

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