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Assuming that the queue is initially empty, the EU immediately draws this instruction from the queue and begins execution. Yb are three conditions that will cause the EU to enter a “wait” mode.

Microprocessor 8086 : Architecture, Programming And Interfacing

It accomplishes this task via the three-bus system architecture previously discussed. The advantage of this pipelined architecture is that the EU can execute instructions almost continually instead of having to wait for the BIU to fetch a new instruction.

To see this, consider what happens when the or is first started. The queue, however, assumes that instructions will always be executed in sequence and thus will be holding the “wrong” instruction codes. The microprocessor 8086 by sunil mathur point to note, however, is that because the EU is the same for each processor, the programming instructions are exactly the same for each.


The BIU is programmed to fetch a new instruction whenever the queue has room for one with the or two with the additional bytes. Once inside the BIU, the instruction is passed to the queue. After waiting for the memory access, the EU can resume executing instruction codes from the queue and the BIU can resume filling the queue. The BIU must suspend fetching instructions and output the address of this memory location. Register IP is incremented by 1 to prepare for the next instruction fetch.

Programs written microprocessor 8086 by sunil mathur the can be run on the without any changes.

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The EU receives program instruction codes and data from the BIU, executes these instructions, and store the results in the general registers.

Architecture, Programming and Interfacing Writer: The first occurs when an instruction requires access to a memory location not in the queue. The second condition occurs when mathr instruction microprocessor 8086 by sunil mathur be microprocessor 8086 by sunil mathur is a “jump” instruction. One other condition can cause the BIU yb suspend fetching.

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 EU must wait while the instruction at the jump address is fetched. The only difference between an microprocessor and an microprocessor is the BIU. It must recognize, decode, and execute program instructions fetched from the memory unit.

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

In this case control is to be transferred to a new nonsequential address. This is a first-in, first-out storage register sometimes likened to a “pipeline”. Note that any bytes presently in the queue must be discarded they are overwritten.

Government of the People: Another difference is that the instruction queue is four bytes long instead of six. In matnurthe BIU data bus path is 8 bits wide versus the ‘s bit data bus.

By passing the data back to the BIU, data can also be stored in a memory location or written to an output device. Note that the EU has no connection to the system buses. It receives and outputs all its data thru the BIU.