barcode reader code in asp.net c# Excitation table for RS ip- op Qt 0 0 1 1 Qt+1 0 1 0 1 S 0 1 0 d R db 0 1 0 in Software

Encode QR Code in Software Excitation table for RS ip- op Qt 0 0 1 1 Qt+1 0 1 0 1 S 0 1 0 d R db 0 1 0

Excitation table for RS ip- op Qt 0 0 1 1 Qt+1 0 1 0 1 S 0 1 0 d R db 0 1 0
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R 0 0 1 1 0 0 1 1
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Qt 0 1 0 1 0 1 Xa X
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An X indicates that this combination of inputs is not allowed A d denotes a don t care entry
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The use of excitation tables will now be demonstrated through an example Let us design a modulo-4 binary up-down counter, that is, a counter that can change state counting up or down in the binary sequence from 0 to 3 For example, if the current state of the counter is 2, an input of 1 will cause the counter to change state up to 3, while an input of 0 will cause the counter to count down to 1 The state diagram for this counter is given in Figure 1427 We choose two RS ip- ops for the implementation (the number of ip- ops must be suf cient to cover all the necessary states two ip- ops are suf cient for a four-state machine) and begin constructing Table 145 by listing the possible inputs, denoted by the variable x, and their effect on the counter Since the counter can have four states and there are two inputs, we must look at eight possible combinations The rst ve columns of Table 145 describe the behavior of the counter for all possible inputs and present states; the behavior of the counter consists of determining the next state, denoted
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Table 144 Truth table and excitation table for JK ip- op Truth table for JK ip- op J 0 0 0 0 1 1 1 1 K 0 0 1 1 0 0 1 1 Qt 0 1 0 1 0 1 0 1 Qt+1 0 1 0 0 1 1 1 0 Excitation table for JK ip- op Qt 0 0 1 1 Qt+1 0 1 0 1 J 0 1 d d K d d 1 0
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Table 145 State transition table for modulo-4 up-down counter Current state q1 0 0 1 1 0 0 1 1 Current state q2 0 1 0 1 0 1 0 1 Next state Q1 1 0 0 1 0 1 1 0 Next state Q2 1 0 1 0 1 0 1 0
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Input x 0 0 0 0 1 1 1 1
S1 1 0 0 d 0 1 d 0
R1 0 d 1 0 d 0 0 1
S2 1 0 1 0 1 0 1 0
R2 0 1 0 1 0 1 0 1
Output y 1 0 1 0 1 0 1 0
Figure 1427 State diagram of a modulo-4 up-down counter
by Q1 Q2 , given the input, x, and the current state, q1 q2 Note that the rst ve columns of Table 145 contain exactly the same information that is given in the diagram of Figure 1427 Now we can refer to the excitation table of the RS ip- op to see what R and S inputs are required to obtain the desired counter function For example, if q1 = 1 and we wish to have Q1 = 0, we must have S1 = 0 and R1 = 1 (we are resetting the rst ip- op) An entire state transition is handled by considering each ip- op independently; for example, if we desire a transition from q1 q2 = 10 to Q1 Q2 = 01, we must have S1 = 0 and R1 = 1, as already stated, and S2 = 1 and R2 = 0 Repeating this analysis for each possible transition, one can then ll the next four columns of Table 145 with the values shown, where d represents a don t care condition So far, we have been able to determine the desired inputs for each ip- op based on the counter input and on the desired state transition Now we need to design a logic circuit that will cause the ip- op inputs to be as stated in Table 145 in response to the input, x This is a rather simple combinational logic problem, illustrated by the Karnaugh maps of Figure 1428 From the Karnaugh maps we obtain the following expressions: S1 = xq 1 q 2 + xq 1 q 2 = (xq 2 + xq2 )q 1 R1 = xq1 q 2 + xq1 q2 = (xq 2 + xq2 )q1 S2 = q 2 R2 = q2 which allow us to complete the design, as shown in Figure 1429
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