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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

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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


Execution unit bus interface unit function 0f 8086 8088?

The 8086/8088 is comprised of two major subsystems; the execution unit (EU), and the bus interface unit (BIU). They are relatively uncoupled, so they can run somewhat independently of each other. The EU is responsible for executing all of the instructions, while the BIU is responsible for processing the requests from the EU to and from external memory. By separating these two major functions, Intel achieved two goals. First, they were able to provide two versions of the same processor, one on an 8-bit bus (the 8088), and the other on a 16-bit bus (the 8086). Both EU's are the same, a 16-bit processor. The two flavors allow the system designer to choose the level of simplicity versus the level of performance. Second, by decoupling the EU from the BIU, the BIU is now able to start fetching instructions from memory, while the EU is busy processing the previous instruction. Depending on the mix of instructions, the BIU is theoretically capable of having the next instruction already fetched and available by the time the EU needs it. This boosts performance.


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