This question asks you to implement memory indirect addressing. For the architecture of Figure P7.1, write the sequence of signals and control actions necessary to execute the instruction ADD [M] , DO that adds the contents of the memory location pointed at by the contents memory location M to register DO, and deposits the results in DO. This instruction is defined in RTL form as [DO] ← [ [M] ] + [DO].

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FIGURE P7.1 Bus A Architecture of a hypothetical computer Read- Write GMSW TEMSW CMAR CMBR CIR F Cpc COO Cp ALU Main store Data in Data out Function select P f(P.Q) Address MAR MBR IR PC DO D1 |CL1 Latch 1 Latch 2 GMSR TEMSA GMBR TEMBR GR TER Gpc TEPC Bus B Goo TED Got TEDI The memory performs a read when Read = 1 and a write when Write = 1