TYPES OF MICROINSTRUCTIONS

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           In the microprogrammed control units all the control signals associated with microoperations are stored in special memory called control memory .
          Set of control signals that cause microoperations to occur is called microinstructions . 

         Micro-programmed control unit can be classified into two types based on the type of Control Word(microinstructions) stored in the Control Memory . 

Horizontal micro-programmed control unit  

Vertical micro-programmed control unit

In Horizontal micro-programmed control unit, the control signals are represented in the decoded binary format.


                   ‘n’ control signals require n bit encoding i.e., 1 bit/CS. 


In Vertical micro-programmed control unit, the control signals are represented in the encoded binary format.


                    ‘n’ control signals require log2n bit encoding.


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