Advances in Computers, Vol. 23

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Adding the two most negative one gives −2a + (−2a ) = 2(−2a ) = −2a+1 . Adding the two more positive: (2a − 2−b ) + (2a − 2−b ) = 2(2a − 2−b ) = 2a+1 − 21−b and | − 2a+1 | > |2a+1 − 21−b |. Then one needs to represent the greatest negative number −2a+1 . Therefore, adding two numbers A(a, b) results in a number A(a +1, b). 1, using numbers A(3, 0), the greatest number is generated summing −8 − 8 = −16. This result needs number A(4, 0), which have range [−16, 15]. For multiplication of two numbers 2’C in A(a, b), we are going to analyze how many bits we need to store the result.

3). 4 shows the inputs and outputs of the 2-bit comparator. 3 Levels of Abstraction 1 2 39 library IEEE; use IEEE. std_logic_1164 . 2 Data Flow Description Data flow description designates the way how data can be transferred from one signal to another without using sequential statements. The data flow descriptions are concurrent; these kinds of descriptions allow to define the flow that data take from one module to another. 4, Fig. 4 NAND true table A B C 0 0 1 1 0 1 0 1 1 1 1 0 A B C 0 0 1 1 0 1 0 1 0 1 1 1 Fig.

22 Quartus II new project wizard ( c 2015 Quartus II Altera) 17 18 1 Introduction to Field-Programmable Gate Arrays sensitive and must exactly match the entity name in the design file). The option to use existing project settings is also available. To continue click next. In Project Type window (see Fig. 23) two options to create the project are shown. On the one hand, Empty project option allows us to create a new project from the beginning, specifying project files, target device and electronic design automation (EDA) tool settings.

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