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instantaneous power power in an AC or modulated signal at a given instant in time. instantaneous-trip circuit breaker es- sentially an inverse-time circuit breaker with instar See instar configuration a term used for a neuron fed by a set of inputs through synaptic Compare with instar training an instar is trained to re- spond to a specific input vector and to no w i (t + 1) = w i (t) + µ(x i − w i (t)) where x i is the ith input, w i (t) the weight from input x i , µ is the training rate starting from about 0.1 and gradually reduced during Compare with Institute of Electrical and Electronics En- a professional organiza- tion of electrical engineers and computer sci- instruction specification of a collection of operations that may be treated as an atomic instruction access fault a fault, signaled in the processor, related to abnormal instruc- instruction cache See instruction counter the memory register within a computer that maintains the location instruction decoder the part of a proces- sor that takes instructions as input and pro- instruction decoder unit in modern CPU implementations, the module that receives an instruction fetch unit in modern CPU implementations, the module that fetches in- instruction field a portion of an instruc- tion word that contains a specified value, instruction format the specification of the number and size of all possible instruction instruction issue the sending of an in- struction to functional units for execution. instruction pipeline a structure that breaks the execution of instruction up into instruction pointer another name for pro- gram counter, the processor register holding c 2000 by CRC Press LLC |