Your friend, the crack circuit designer, has offered to redesign one of the units in the multicycle MIPS processor to be much faster. Using the delays from Table 7.6, which unit should she work on to obtain the greatest speedup of the overall processor? How fast should it be? (Making it faster than necessary is a waste of your friend’s effort.) What is the cycle time of the improved processor?

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Table 7.6 Delays of circuit elements Element Parameter Delay (ps) register clk-to-Q tpcg 30 register setup tsetup 20 multiplexer tmux 25 ALU TALU 200 memory read tmem 250 register file read tRFread 150 register file setup tREsetup 20