The circuit generates the following arithmetic operations along with input

The circuit generates the following arithmetic

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inputs A and B. The circuit generates the following arithmetic operations along with input carry C in. Draw the logic diagram for the first two stages. S1 S0 C in =0 C in =1 0 0 D=A+B D=A+B+1 0 1 D=A-B D=A+ +1 1 0 D=A D=A+1 1 1 D=A-1 D=A 2. a) A computer uses a memory unit with 512K words of 64 bits each. A binary instruction code is stored in one word of memory. The instruction has four parts: an indirect bit, an operation code, a register code part to specify one of 32 registers, and an address part. Draw the instruction word format and indicate the number of bits in each part. b) Elaborate the differences between a branch instruction, a call subroutine instruction and program interrupt with an example. c) What is meant by effective address? An instruction is stored at location 300 with its address filed at location 301. The address field has the value 400. A processor register R1 contains the number 200. Evaluate the effective address if the addressing mode of the instruction is direct, relative, immediate, index with R1 as the index register, implied and register indirect.
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  • Spring '16
  • Central processing unit, Processor register, CPU cache, Machine code

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