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q explain microcode and vlsi technologyit is considered that cu of a computer be assembled using two ways create micro-program which execute
in the past there was a large gap between speed of a memory andprocessor so a subroutine execution for an instruction for illustration floating point
q show various risc processorsrisc has fewer design bugs and its simple instructions decrease design time sodue to all the above important reasons
q show the importance of risc processorsreduced instruction set computers recognize a comparatively limited number of instructions one benefit of a
the goal of computer architects is to design computers that are cheaper and more powerful than their predecessors a cheaper computer has low hardware
q decoding of slightly encoded micro-instructionsgenerally micro-programmed control unit designs are neither totally unencoded nor highly encoded
highly encoded micro-instructions encoded bits required in micro-instructions are small it provided an aggregated view that is a higher view of cpu
unencoded micro-instructions one bit is required for each control signal so number of bits needed in a micro-instruction is high it represents a
q characteristics of extreme unencoded micro-instructions1 two sources can be attached by respective control signals to a single destination though
the micro-instruction cycle can comprises two basic cycles the fetch and execute here in the fetch cycle address of micro-instruction is produced and
q explain types of micro-instructionsin general micro-instruction can be classifiedin two general kinds these are non-branching and branching after
q instruction of a micro-programa micro-instruction is an instruction of a micro-program it specifies one or more than one micro-operations that can
micro-instructions are stored in control memory address register for control memory comprises the address of subsequent instruction which is to be
q explain about interrupt cycleon completion of execute cycle the current instruction execution gets completed at this point a test is made to
q illustrate the execute cyclethe fetch and indirect cycles include a small fixed sequence of micro-operations every one of these cycles has fixed
q explain indirect cycle in control unitonce an instruction is fetched the subsequent step is to fetch the operands the instruction may have indirect
q explain the fetch cyclethe beginning of every instruction cycle is the fetch cycle and causes an instruction tobe fetched from memory the
q how are control signals achieve the particular operationthe control signals are applied directly as binary inputs to the logic gates of the logic
control signals from control bus a number of the control signals are provided to control unit by the control bus these signals are issued from
q explain about instruction register and flagsthe instruction register it comprises the operation code opcode and addressing mode bits of the
q what is master clock signal in control unitthe master clock signal this signal causes micro-operations to be executed in a square in a single clock
q make an instruction execution feasiblewhat are the functions that a control unit performs to make an instruction execution feasible instruction
q explain micro-operations performed by cputhe micro-operations performed by cpu can be categorized as micro-operations for data transfer
q functional requirements of a control unitlets first try to define functions that a control unit should perform in order to get things to happen
q fundamental components of a cputhe two fundamental components of a cpu are control unit and arithmetic and logic unit the control unit of cpu