Each byte has a unique row and column address. Summary Memory Addressing A 3-dimensional array is arranged as rows and columns. For example the blue byte is located in row 7. In a 2-dimensional array, a byte is accessed by supplying a row number. In PCs, a byte is the smallest unit of data that can be accessed.
Summary Memory Units The location of a unit of data in a memory is called the address. In assembly language, a 32 bit entity is called a double-word and 64 bits is defined as a quad-word. For historical reasons, assembly language defines a word as exactly two bytes. By this definition, a word is equal to the internal register size (usually 16, 32, or 64 bits). Generally, a word is defined as the number of bits handled as one entity by a computer. Computer memories are organized into multiples of bytes called words. The most common unit is the byte, which by definition is 8 bits. Summary Memory Units Memories store data in units from one to eight bits. Digital Fundamentals Tenth Edition Floyd Chapter 10
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