M. Mateen Yaqoob The University of Lahore Spring 2014.

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Presentation transcript:

M. Mateen Yaqoob The University of Lahore Spring 2014

 The adder and logic circuit has three sets of inputs  One set of 16 inputs comes from the output of AC  Another set of 16 inputs comes from the data register DR  Third set of eight inputs comes from the input register INPR  The outputs of adder and logic circuit provide the data inputs for register  In addition, it is necessary to include logic gates for controlling LD, INR, and CLR in register and for controlling the operation of adder and logic circuit

 In order to design the logic associated with AC, it is necessary to go over register transfer statements and extract the statements that change the content of AC

 Gate configuration is derived from the control functions.  Control function for clear micro-operation is rB 11  Output of AND gate that generates this function is connected to the CLR input of register  Similarly output of gate that implements the increment micro-operation is connected to INR input of register  Other seven microoperations are generated in the adder and logic circuit and are loaded into AC at proper time  The output of gates for each control function is used for design of adder and logic circuit

 It can be subdivided into 16 stages, each stage corresponding to one bit of AC  Each stage has a JK flip-flop, two OR gates, and two AND gates  The load (LD) input is connected to the inputs of AND gates  When LD is enabled, the 16 inputs are transferred to AC (0-15)

 One stage of adder and logic circuit consists of seven AND gates, one OR gate and a full-adder (FA)  AND operation is achieved by ANDing AC(i) with corresponding bit in the data register DR(i)  One stage of adder uses a full-adder with the corresponding input and output carries  The transfer from INPR to AC is only for bits 0 through 7  The complement micro-operation is obtained by inverting bit value in AC  Shift-right operation transfers the bit from AC(i+1), and the shift-left operation transfers the bit from AC(i-1)  Complete adder and logic circuit consists 16 stages connected together