microinstruction

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microinstruction

[¦mī·krō·in′strək·shən]
(computer science)
The portion of a microprogram that specifies the operation of individual computing elements and such related subunits as the main memory and the input/output interfaces; usually includes a next-address field that eliminates the need for a program counter.

microinstruction

A single instruction in microcode. It is the most elementary instruction in the computer, such as moving the contents of a register to the arithmetic logic unit (ALU). It takes several microinstructions to carry out one complex machine instruction (CISC). Also called a "micro-op" or "µop," microinstructions differ within the same computer family and even the same vendor. For example, although all are x86 chips, the microcode for Intel's Pentium 4, Pentium M and AMD's Athlon are not the same. The software programmer never sees microinstructions, and they are not documented for the public. See microcode.
References in periodicals archive ?
Therefore the main idea is to divide the microinstructions into two subsets as below:
To realize MPM, the field FLC of microinstructions should contain only three codes 01, 10 and 00 corresponding to X7, X3 and the unconditional transition (UnT) respectively.
In analyzing the classical method of synthesizing the automaton with combined addressing microinstructions using the ASM [G.sub.1], the following parameters can be stated:
In this work, a new method of reducing the microinstructions of synchronous digital systems is proposed.
--Reducing the number of microinstructions and the executed time of the micro-program occur according to the additional circuit of addresses the additional circuit of addresses minimizes the number of microinstruction that leads.
--The cycle time of microinstruction is increased because of the additional multiplexers But, in general, as the number of microinstructions is decreased the general throughput of the algorithm is also decreased.
Keywords: Digital Systems, Microinstruction (MI), Synchronized Systems, Combined Addressing, Throughput.