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Unformatted text preview: F.4 Chapter 4 Solutions 4.1 Components of the Von Neumann Model: (a) Memory: Storage of information (data/program) (b) Processing Unit: Computation/Processing of Information (c) Input: Means of getting information into the computer. e.g. keyboard, mouse (d) Output: Means of getting information out of the computer. e.g. printer, monitor (e) Control Unit: Makes sure that all the other parts perform their tasks correctly and at the correct time. 4.2 The communication between memory and processing unit consists of two registers: Memory Address Register (MAR) and Memory Data Register (MDR). To read, the address of the location is put in MAR and the memory is enabled for a read. The value is put in MDR by the memory. To write, the address of the location is put MAR, the data is put in MDR and the Write Enable signal is asserted. The value in MDR is written to the location specified. 4.3 The program counter does not maintain a count of any sort. The value stored in the program counter is the address of the next instruction to be processed. Hence the name Instruction Pointeris more appropriate for it. 4.4 The size of the quantities normally processed by the ALU is referred to as the word length of the computer. The word length does not affect what a computer can compute. A computer with a smaller word length can do the same computation as one with a larger word length; but it will take more time....
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This homework help was uploaded on 04/07/2008 for the course ECE 495K taught by Professor Vijaykumar during the Spring '08 term at Purdue University-West Lafayette.
- Spring '08