Table of Contents
- 1 What is a Microinstruction?
- 2 What is the purpose of Microinstruction executions?
- 3 What do you understand by Microinstruction and microprogram?
- 4 What is the difference between instruction and microinstruction?
- 5 What concerns are involved in the design of a microinstruction sequencing technique?
- 6 How many bits Microinstruction format is used in control memory?
- 7 What is microinstruction control?
- 8 What is the difference between RISC and CISC architecture?
- 9 What is the format of micro-instruction?
- 10 What is the microinstruction format for the control memory?
- 11 How is the microinstruction address calculated?
What is a Microinstruction?
Definition of microinstruction : a computer instruction that activates the circuits necessary to perform a single machine operation usually as part of the execution of a machine-language instruction.
What is the purpose of Microinstruction executions?
The fetch portion is determined by the generation of a microinstruction address and the execution of a microinstruction is to generate control signals. Some of these signals control points internal to the processor. The remaining signals go to the external control bus or other external interface.
What is a symbolic micro program?
Computer ArchitectureComputer ScienceNetwork. The microinstructions can be determined by symbols. It is interpreted to its binary format with an assembler. The symbols should be represented for each field in the microinstruction.
What do you understand by Microinstruction and microprogram?
As nouns the difference between microinstruction and microprogram. is that microinstruction is an extremely low level instruction indicating a tiny task a cpu is to perform while microprogram is (computing) a set of microinstructions in a cpu, used to implement machine instructions.
What is the difference between instruction and microinstruction?
As nouns the difference between instruction and microinstruction. is that instruction is (lb) the act of instructing, teaching, or furnishing with information or knowledge while microinstruction is an extremely low level instruction indicating a tiny task a cpu is to perform.
What are types of Microinstruction available?
Types of microinstruction formats:
- Horizontal Format, called Horizontal microcode.
- Vertical Format, called Vertical microcode.
- Field-encoded Format.
What concerns are involved in the design of a microinstruction sequencing technique?
Two problems are involved in the design of a micro-instruction sequencing technique is the size of micro-instruction and the address-generation time. The first concern is obvious minimizing the size of the control memory. The second concern is simply a desire to execute microinstruction as fast as possible.
How many bits Microinstruction format is used in control memory?
➢ The microinstruction format is composed of 20 bits with four parts to it • Three fields F1, F2, and F3 specify microoperations for the computer [3 bits each] • The CD field selects status bit conditions [2 bits] • The BR field specifies the type of branch to be used [2 bits] • The AD field contains a branch address [ …
What logic generates microinstruction address?
– Control address register – contains the address of the next microinstruction to be executed.
What is microinstruction control?
Microinstructions are usually stored in groups where each group specifies a routine, where each routine specifies how to carry out an instruction. – This involves taking the instruction’s opcode and transforming it into an address for the the instruction’s microprogram in control memory.
What is the difference between RISC and CISC architecture?
One of the major differences between RISC and CISC is that RISC emphasizes efficiency in cycles per instruction and CISC emphasizes efficiency in instructions per program. RISC needs more RAM, whereas CISC has an emphasis on smaller code size and uses less RAM overall than RISC.
Is a Microoperation the same thing as a machine instruction?
Is a microoperation the same thing as a machine instruction? No. An assembly language instruction is made up of multiple microoperations. Explain the steps of the fetch-decode-execute cycle.
What is the format of micro-instruction?
Now let’s focus on format of a micro-instruction. The two widely used formats employed for micro-instructions are vertical and horizontal. In horizontal micro-instruction every bit of micro-instruction signifies a control signal that directly controls a single bus line or occasionally a gate in the machine.
What is the microinstruction format for the control memory?
The microinstruction format for the control memory is shown in Fig. 3-6. The 20 bits of the microinstruction are divided into four functional parts. The three fields F1, F2, and F3 specify microoperations for the computer.
What is the difference between control microinstruction and branch instruction?
The first format provides the control microinstruction (i.e. the bits are used to generate control signals) , while the second format provides the branch logic and address (there can be conditional or unconditional branch).
How is the microinstruction address calculated?
In the first format, the microinstruction contains control signals, then the next microinstruction address is calculated either by using the op-code of the instruction register or it is the address of the next microinstruction in sequence. In this approach, an extra cycle is needed for branch microinstruction.