This Is a Three-Part Question About Critical Path Calculation

question 12

Essay

This is a three-part question about critical path calculation. Consider a simple single- cycle implementation of MIPS ISA. The operation times for the major functional components for this machine are as follows:
- Below is a copy of the MIPS single-cycle datapath design. In this implementation the clock cycle is determined by the longest possible path in the machine. The critical paths for the different instruction types that need to be considered are: R-format, Load-word, and store-word. All instructions have the same instruction fetch and decode steps. The basic register transfer of the instructions are:
Fetch/Decode: Instruction <- IMEM[PC];
R-type: R[rd] <- R[rs] op R[rt]; PC <- PC + 4;
Load: R[rt] <- DMEM[ R[rs] + signext(offset)]; PC <- PC +4; store: DMEM[ R[rs] + signext(offset)] <- R[Rt]; PC <- PC +4;
(Part B)
Place the latencies of the components that you have decided for the critical path of each instruction in the table below. Compute the sum of each of the component latencies for each instruction.

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