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Microprocesslr IP is incremented by 1 to prepare for the next instruction fetch. After waiting for the memory access, the EU can resume executing instruction 80086 from the queue and the BIU can resume filling the queue. The BIU is programmed to fetch a new instruction whenever the queue has room for one with the or two with the additional bytes.

The advantage of this pipelined architecture is that microprocessor 8086 by sunil mathur EU can execute instructions almost continually instead of having to wait for the BIU to fetch a new instruction.

Government of the People: The important point to note, however, is that because the EU is the microprocessor 8086 by sunil mathur for each processor, the programming instructions are exactly the same for each.

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Microproessor queue, however, assumes that instructions will always be executed in sequence and thus will be holding the “wrong” instruction codes. Assuming that the queue is initially empty, the EU immediately draws this instruction from the queue and begins execution.


The only difference between an microprocessor and an microprocessor is the BIU. The BIU must suspend fetching instructions and output the address of this memory location. Once inside the BIU, the instruction is passed to the queue.

In this case control is to be transferred to a new nonsequential address. It receives and outputs all its data thru the BIU.

It must recognize, decode, and execute program instructions fetched from the memory unit. Architecture, Programming and Interfacing Writer: To see this, consider what happens when the or is first started.

Note that the EU has no connection to the system buses. This is a first-in, first-out storage register sometimes likened to a “pipeline”.

The EU receives program instruction codes and data from the BIU, executes these instructions, and store the results in the general registers. Note that any bytes presently in the queue must be discarded they are overwritten.

There are three conditions that will cause the EU to enter a “wait” mode. In thethe BIU data bus path is 8 bits wide versus the ‘s bit data bus. The EU must wait while the instruction at microprocessor 8086 by sunil mathur jump address is fetched.


Depending on the execution time of the first instruction, the BIU may fill the queue with several new instructions before the EU is ready to draw its next instruction. The first occurs when an instruction requires access to a memory location not in the microprocessor 8086 by sunil mathur. By passing the data back to the BIU, data can also be stored in a memory location or written to an output device.

Microprocessor : Architecture, Programming and Interfacing – Mathur Sunil – Google Books

The second condition occurs when the instruction to be executed is a “jump” instruction. Programs written for the can microprocesor run on the without any changes. It accomplishes this task via the three-bus system architecture previously discussed.

Another difference is that the instruction queue is four bytes long instead of six. One other condition can cause the BIU to suspend fetching.