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What is the basic difference between single cycle computer and multi-cycle computer?
another important difference between the single-cycle design and the multi-cycle design is the cycle time. in the single cycle processor, the cycle time was determined by the slowest instruction. in the multi-cycle design, the cycle time is determined by the slowest functional unit [memory, registers, alu].
What is a multi-cycle datapath and what does it do?
Multi-cycle implementaion: break up instructions into separate steps. Each step takes a single clock cycle. Each functional unit can be used more than once in an instruction, as long as it is used in different clock cycles. Reduces amount of hardware needed.
Why a single cycle implementation is not used today?
1-cycle implementation is not used Because the length of the clock cycle will always be determined by the slowest operation (lw, sw) even if the data memory is not used. Practical implementations use multiple cycles per instruction, which fixes some shortcomings of the 1-cycle implementation.
What’s the difference between single cycle and multiple cycle datapaths?
1. Single Cycle Datapaths : Single Datapaths is equivalent to the original single-cycle datapath The data memory has only one Address input. The actual memory operation can be determined from the MemRead and MemWrite control signals. There are separate memories for instructions and data. There are 2 adders for PC-based computations and one ALU.
How are steps divided in a single cycle instruction?
Each step takes a single clock cycle Each functional unit can be used more than once in an instruction, as long as it is used in different clock cycles. It reduces the amount of hardware needed. It reduces average instruction time. Instructions are not subdivided. Instructions are divided into artitoray number of steps.
Which is faster single cycle or multiple cycle?
Extra registers are required to hold the result of one step for use in the next step. Performance is baseline. Performance is slightly slower to mederaletly faster than single cycle, latter when the instructions steps are well balanced and a significantly fractions of the instructions take less than the maximum number of cycles.