1 - Topic Main 1 Memory LEARNING OUTCOMES By the end of...

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INTRODUCTION The process of entering instruction and data into a memory is called Write, whereas the process of accessing instruction and data from a memory is known as Read. The Memory can be divided into two: (a) Read Only Memory (ROM): type of memory that only can read the contents. (b) Random Access Memory (RAM): type of memory that can read and write. Besides these types of memory, there are two others in a computer system i.e Associate Memory and Cache Memory. Memory is a computer component that saves instruction and data. T T o o p p i i c c 1 Main Memory 1 LEARNING OUTCOMES By the end of this topic, you should be able to: 1. Identify types of memory, ways of accessing data and the capacity of each memory. 2. Explain the process of byte arrangement.
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TOPIC 1 MAIN MEMORY 2 MEMORY ADDRESS The basic unit in a memory is binary code, which is called a bit. Bit uses the symbols 0 and 1. The combination of eight bit is known as 1 byte. Memory has a number of cells and locations, each of it can save one data. A cell in a memory is known as word. The word size in a machine is not necessary the same as in other machines. Each of the word has its own number, which is called address. The location of each data or instruction in a memory can be referred through this address. If a memory has n word, then it has an address from 0 until n-1. The number of location depends on the address size. If m bit data is used to save address, then the number of cells can be referred as 2 m . The illustration of a memory and the concept of address memory locations are shown in Figure 1.1. Memory Address Data Max Data 0 Data 1 Data 2 Data 3 Data 4 Data Max Do you know the difference between memory address and data address? SELF-CHECK 1.1 0 1 2 3 4 5 1.1 Figure 1.1: Illustration of a memory and the address
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TOPIC 1 MAIN MEMORY 3 ACTIVITY 1.1 1. How many locations exist if the address size is (a) 16 bit (b) 32 bit 2. What is the address size if the number of location is (a) 1024 (b) 2048 CAPACITY 1.2 Capacity is the total of bits that can be loaded into a memory. This capacity is usually measured by using short forms K, M, or G where the actual meaning is kilobytes, megabytes and gigabytes. 1 K byte = 1024 byte 1 M byte = 1024 K byte 1 G byte = 1024 M byte BYTE ARRANGEMENT 1.3 SELF-CHECK 1.2 What do you know about the bytes? The byte in a word can be numbered from left to right or from right to left. In a
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This note was uploaded on 04/22/2010 for the course IT CBCN1103 taught by Professor Shaharimantalib during the Spring '10 term at co-.

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1 - Topic Main 1 Memory LEARNING OUTCOMES By the end of...

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