A computer has 32 -bit instruction and 12 -bit addresses. If there are 250 two-address instructi

step 1 As we know, as we know, 2 to the power 8 is equal to 256 combinations. Combinations. And I can d

A computer has 32 -bit instruction and 12 -bit addresses. If...

Key Concepts

Instruction Word Format

This concept deals with how a fixed-length instruction (such as 32 bits) is partitioned into fields like opcode and operand addresses. The allocation of bits to each field determines how many unique operations can be encoded and how many bits are left over for addressing memory locations.

Addressing Modes

Addressing modes refer to the manner in which instructions specify the locations of the operands they use. For instance, one-address or two-address instructions use the available bits differently: two-address instructions require two separate address fields, which constrains the number of bits available for the opcode, impacting the overall instruction encoding scheme.

Bit Allocation in Instruction Encoding

In computer architecture, the total number of bits in an instruction is divided between different components such as opcodes and address fields. The design decision on how many bits are used for addressing (address field width) directly affects how many bits remain for opcodes, ultimately determining the capacity of distinct instructions that can be formulated.

Instruction Set Complexity

This concept involves understanding how the structure of the instruction set—especially the division between different types of instructions (e.g., one-address vs. two-address)—influences the total number of operations a processor can support. The constraints imposed by the fixed instruction length and the size of address fields create a trade-off between the richness of the instruction set and the number of operations available.

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