Write the register transfer sequence to read a word from memory.

ANSWER:          
  The procedure of reading a word into memory location is similar to that for writing one from memory except that the data word to be read is first loaded into the MDR, the read command is issued.

Example: 

              Assumes that the data word to be stored in the memory is in register R1 and that the memory address is in register R2. The memory read operation requires the following sequence:

1. MAR <-- [R2]
2. MDR <-- [R1]
3. Read
4. Wait for MFC

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