Need help with part B.

Thank you

1) 1. For the instruction: IF-ICMPEQ offset A) Explain the purpose of each step of the following microprogram ifjcmpeq1 MAR = SP = SP-1; rd. if icmpeq2 MAR SP -SP-1 ifcm peq4 OPC=TOS if icmpeq5 TOS MDR if_icmpeq6 Z OPC -H Read in next-to-top world of stack Set MAR to read in new top-of-stack Copy second stack word to H Save TOS in OPC temporarily Put new top of stack in TOS If top 2 words are equal, goto T, else F B) Why do we need to temporarily copy TOS in OPC in cycle 4 and later use it for comparison in cycle 6 instead of doing the comparison in one cycle