A digital computer has u memory unit with 32 bits per word. The instruction set

Question

A digital computer has u memory unit with 32 bits per word. The instruction set consists of 110 different operations. All instructions have an operation code part (opcode) and two address fields: one for a memory address and one for a register address. This particular system includes eight general-purpose, user-addressable registers. Registers may be loaded directly from memory, and memory may be updated directly from the registers. Direct memory to memory data movement operations are not supported. Each instruction is stored in one word of memory. low many bits arc needed for the opcode How many bits are needed to specify the register? How many bits are left for the memory address part of the instruction? What is the maximum allowable size for memory? What is the largest unsigned binary number that can be accommodated in one word of memory?

Explanation / Answer

a) 8 bits for opcode required

    as 27 = 128

      28=256

x = log2110 = x= 7

b) x = log27 = x= 2

c) 32-(6+2) =24 bits

d)224 = 1677721 words

e)232 = 4294967296

first is zero

     so largest number is 4294967295

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