Computer Architecture

Write the short note on microoperations and various categories.

A microoperation is a basic operation performed on the information stored in one or more registers. The result obtained after the operation may replace the previous binary information of a register or may be put into another register. Shift, count, clear, and load are the examples of microoperations A counter with parallel load can perform the microoperations increment and load. A bidirectional shift register can perform the shift right and shift left microoperations. In a digital computer, the internal hardware organization is best defined by specifying –

(i) Set of registers it contains and their function.

(ii) Sequence of microoperations performed on the binary information stored in the registers.

(iii) Control that initiates the sequence of microoperations.

In a computer, the sequence of microoperations can be specified by explaining every operation in words, but this procedure generally involves a lengthy descriptive explanation. It is more convenient to adopt an appropriate symbology to describe the sequence of transfers between registers and the various arithmetic and logic microoperations associated with the transfers The use of symbols instead of a narrative explanation provides an organized and concise way for listing the microoperation sequences in registers and the the control functions which initiate them.

Various categories:-

Microoperations are classified into four categories –

(i) Register transfer microoperations transfer binary information from one register to another.

(ii) Arithmetic microoperations perform arithmetic operations on numeric data stored in registers.

(iii) Logic microoperations perform bit manipulation operations on non-numeric data stored in registers.

(iv) Shift microoperations perform shift operations on data stored in registers

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