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Computer Science Articles
Page 19 of 53
What is Microprogram Sequencing?
The microcode for the control memory should be generated by the inventor once the configuration of the computer is settled. The generation of code is known as microprogramming.There are various points to be treated while designing the microprogram sequencer are −Size of the microinstructionTime of address generationThe microinstruction’s size should be in the least, therefore that the control memory necessary is less and the cost is decreased. Microinstructions can be implemented at a quicker rate if the time to create an address is less. This results in raised throughput.Disadvantage of Micro-program SequencingThe disadvantage of microprogram sequencing is as follows −If ...
Read MoreWhat are Subroutines?
Subroutines are programs that are used by other routines to accomplish a particular task. A subroutine can be called from any point within the main body of the micro-program. Frequently, many micro-programs contain identical sections of code. Microinstructions can be saved by employing subroutines that use common sections of microcode.For example, the sequence of micro-operations needed to generate the effective address of the operand for instruction is common to all memory reference instructions. This sequence could be a subroutine that is called from within many other routines to execute the effective address computation.Micro-programs that use subroutines must have a provision ...
Read MoreWhat is Instruction Mapping in Computer Architecture?
A unique type of branch exists when a microinstruction defines a branch to the first word in control memory where a micro-program routine for instruction is placed. The status bits for this type of branch are the bits in the operation code part of the instruction. For example, a computer with a simple instruction format as shown in the figure.It has an operation code of four bits which can specify up to 16 distinct instructions. It can consider that the control memory has 128 words, needing an address of seven bits. For each operation code, there exists a micro-program routine ...
Read MoreWhat is Conditional Branching?
A conditional branch instruction is a branch instruction that may or may not generate a transmission of control that relies upon the value of stored bits in the PSR (processor status register). It provides decision-making capabilities in the control unit.The status conditions are special bits in the system that provide parameter information such as the carry-out of an adder, the sign bit of a number, the mode bits of instruction, and input or output status conditions. Information in these bits can be tested and actions initiated based on their condition: whether their value is 1 or 0.The status bits, together ...
Read MoreWhat is Address Sequencing in Computer Architecture?
Microinstructions are saved in control memory in groups. These groups describe routines. Each computer instruction has its microprogram routine that can create micro-operations. These micro-operations can execute instructions. The hardware consists of controls for the address sequencing of the microinstructions of a similar routine. They also branch the microinstructions.There are the following phases that the control has while implementing a computer instruction −When power is turned on, and address is initially loaded into the control address register. (This is the address of the first microinstruction).The control address register is incremented resulting in sequencing the fetch routine.After the fetch routine, the ...
Read MoreDifference between Hardwired Control Unit and Microprogrammed Control Unit
Hardwired Control UnitA hardwired control is a structure of making control signals using Finite State Machines (FSM) suitably. It is created as a sequential logic circuit. The final circuit is generated by physically linking the components including gates, flip flops, and drums are known as the hardwired controller.Microprogrammed Control UnitA control unit whose binary control values are saved as words in memory is called a microprogrammed control unit.In these instructions, the control memory is considered to be ROM, where all the information is saved permanently. The memory address of the control unit denotes the address of microinstruction.The microinstruction has a ...
Read MoreWhat is Control Memory?
A control memory is a part of the control unit. Any computer that involves microprogrammed control consists of two memories. They are the main memory and the control memory. Programs are usually stored in the main memory by the users. Whenever the programs change, the data is also modified in the main memory. They consist of machine instructions and data.The control memory consists of microprograms that are fixed and cannot be modified frequently. They contain microinstructions that specify the internal control signals required to execute register micro-operations.The machine instructions generate a chain of microinstructions in the control memory. Their function ...
Read MoreHow to Control Common Bus in Computer Architecture?
A bus is a structure that handles the data transmission in a computer system or network. The common bus of 16-bit is controlled by the selection inputs S2, S1 , and, S0.Each binary number is associated with a Boolean variable x1 through x7, corresponding to the gate structure that must be active to select the register or memory for the bus.For example, when x1 = 1, the value of S2, S1 , and, S0 must be 001 and the output of AR will be selected for the bus.The decimal number shown with each bus input indicates the binary equivalent that ...
Read MoreWhat is control of Single Flip-Flops?
Flip flops are an application of logic gates. A flip-flop is a basic memory element that can save one bit of data. Flip flop has two stable states. One of the stable states is called SET or 1. The other stable state is known as RESET, CLEAR, or 0.A flip-flop circuit can stay in a binary state continually (as long as power is transferred to the circuit) before conducted by an input signal to switch states. The control gates for the seven flip-flops can be determined similarly. For example, the table shows that IEN may change as a result of ...
Read MoreWhat is control of Register and Memory in Computer Architecture?
The control inputs to registers and memory are −Load (LD) − When it is enabled, the content from the source register or memory can be transferred to/from the bus.Increment (INR) − It can increment the register by 1.Clear (CLR) − It can clear the register.The figure shows a scheme for the control of registers and memory.As shown in the diagram, all the register transfer statements are checked originally which modifies the content of AR.The instructions are as follows −R′T0:AR ← PCR′T2:AR ← IR(0 − 11)D′7IT3 :AR ← M[AR]RT0:AR ← 0D5T4:AR ← AR + 1The first three statements determine the transfer ...
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