CO-3 - Unit-III Micro-programmed control Hardwired control...

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Unit-III Micro-programmed control Hardwired control versus Micro-programmed control There are two types of control organization: hardwired control and micro-programmed control. Hardwired control In the hardwired organization, the control logic is implemented with gates, flip-flops, decoders and other digital circuits. It has the advantage that it can be optimized to produce a fast mode of operation. A hardwired control, as the name implies, requires changes in the wiring among various components if the design has to be modified or changed.
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Hard wired control vs. Micro-programmed control (Contd.,) Most computers based on the reduced instruction set computer (RISC) architecture concept, use hardwired control. Micro-programmed control : In the micro-programmed organization, the control information is stored in a control memory. The control memory is programmed to initiate the required sequence of micro-operations. In the micro-programmed control, any required changes or modifications can be done by updating the micro-program in control memory.
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Micro-programmed control unit A control unit whose binary control variables are stored in memory is called a micro-programmed control unit . Micro-program : a sequence of micro instructions (Slides 7,8 and 9) Micro-programmed control organization External input Next address information Next- Address generator Control Address register Control Memory (ROM) Control Data register Control word
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Micro-programmed control organization The general configuration of a micro-programmed control unit is demonstrated in the block diagram. The control memory is assumed to be a ROM, within which all control information is permanently stored. The control memory address register specifies the address of the micro-instruction, and the control data register (CAR) holds the micro instruction read from memory.
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Contd., While the micro-operations are being executed, the next address is computed in the next address generator (sequencer)
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This note was uploaded on 02/23/2012 for the course CS 101 taught by Professor Martand during the Spring '10 term at Punjab Engineering College.

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CO-3 - Unit-III Micro-programmed control Hardwired control...

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