Salient features of direct addressing mode, Computer Engineering

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Q. Salient features of direct addressing mode?

A number of salient points about this technique are:

  • This scheme offers a limited address space since if address field has n bits then memory space would comprise 2n memory words or locations. I.e. for illustration machine of Figure above direct addresses memory space will be 210.

 • The effective address in this technique is described as address of operand which is,

EA  <-- A     and    (EA in the above illustration will be 500)

D = (EA)      (D in the above illustration will be 7) 

The second statement implies that the data is stored in memory location specified by effective address.

  • In this addressing technique only one memory reference is needed to fetch the operand.

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