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The execution unit execute the instruction while the bus interface unit do the fetching and shows the results as an output
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∙ 11y ago
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∙ 11y agoYAWA
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What is execution unit and bus interface unit?
In the 8086/8088, the execution unit is the part of the processor known as the CPU. It executes the instructions and generates the results. The bus interface unit, on the other hand, is the part of the processor that handles reading and writing to memory. The two are somewhat loosely coupled, with the bus interface unit attempting to always be ahead of the execution unit, i.e. using the cache, so that the execution unit's wait time is minimized and performance is maximized.
What is a bus interface unit?
The bus interface unit is the part of the processor that interfaces with the rest of the PC. Its name comes from the fact that it deals with moving information over the processor data bus, the primary conduit for the transfer of information to and from the CPU. The bus interface unit is responsible for responding to all signals that go to the processor, and generating all signals that go from the processor to other parts of the system.
Which processing unit of the 8088 is the interface to te outside world?
The Bus Interface Unit (BIU)
What do BIU and EU stand for and what are their functions?
biu stands for bus interface unit and eu stands for execution unit. In 8086 microprocessor BIU fetches the instructions and places in the queue. The Eu executes the fetched instruction and places the result in the registers
Explain the function of BIU and EU in 8086?
biu stands for bus interface unit and eu stands for execution unit. In 8086 microprocessor BIU fetches the instructions and places in the queue. The Eu executes the fetched instruction and places the result in the registers
What is bus unit?
The bus interface unit is the part of the processor that interfaces with the rest of the PC. Its name comes from the fact that it deals with moving information over the processor data bus, the primary conduit for the transfer of information to and from the CPU. The bus interface unit is responsible for responding to all signals that go to the processor, and generating all signals that go from the processor to other parts of the system.
Notes on the Execution unit bus interface unit function 0f 8086 8088?
Responsible for: o Performing all external bus operations (timing, interfacing) and: § Instruction fetch § Reading/writing data operands from/to memory § Inputting/outputting data for I/O peripherals § These information transfers take place over the system bus o Performing instruction queuing, and phyis-address generation
How many data lines are necessary in 16-bit microprocessor?
It depends. From the CPU's point of view, 16 data lines are necessary in a 16-bit microprocessor. Some implementations, however, such as the 8088, use an 8-bit bus, instead of like the 8086, which uses a 16-bit bus. The Bus Interface Unit (BIU) handles the conversion, packing, and unpacking transparently to the Execution Unit (EU or CPU).
Why processor utilisation rate can be improved in a multimicroprocessor system by an instruction queue?
The bus interface unit provides the func- tions related to instruction fetching and queuing, op- erand fetch and store, and address relocation. This unit also provides the basic bus control. The overlap of instruction pre-fetching provided by this unit serves to increase processor performance through improved bus bandwidth utilization. Up to 6 bytes of the instruction stream can be queued while waiting for decoding and execution.
What technology called a processor can begin executing an instruction before it completes the previous instruction?
The 8085 microprocessor does not prefetch instructions. The 8086/8088 and higher microprocessors do, in order to boost performance. They are trading idle time in the bus-interface unit, idle time waiting on the execution unit, in order to attempt to have the next instruction already fetched and available when the execution unit finally needs it. This is done by separating the execution unit from the bus-interface unit, and allowing them to operate somewhat asynchronously. Since most instructions will be followed by instructions at the next higher address, this can boost performance by minimizing idle time.
How does 8086 queue speeds up processing?
The instruction prefetch queue speeds up the processing of microprocessors by attempting to have the next opcode bytes available to the execution unit before it actually needs them. This works because, statistically, there is time spent by the execution unit in executing a particular instruction; time that the bus interface unit can use to go ahead and prefetch the next opcode bytes. Sometimes, this results in a loss of time, because the execution unit may branch to some other location. Modern processors attempt to sidestep that by using branch prediction algorithms.
What are the parts of a microprocessor?
The microprocessor contains the CPU of a microcomputer. It is composed of the Arithmetic Logic Unit, Cache Memory (optional), Memory Management Unit (optional), Bus Interface Unit, Control Unit, Instruction Decoder, and Registers.
