Section 7.6: Example of control points and the fetch/decode/execute cycle (Frame 9)                     [prev][home][next]

  1. The lower 12 bits of the IR are copied into MAR (the top 4 are ignored; the MAR is only 12 bits long anyway), which is the beginning of the operand fetch stage. The operand is located inside memory word 3170, and is the value 11.