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Microprocessor 8086 : Architecture, Programming And Interfacing

microprocessor 8086 by sunil mathur The BIU must suspend fetching instructions and output the address of this memory location. By passing the data back to the BIU, data can also be stored in a memory location or written to an output device.

Register IP is incremented by 1 to prepare for the next instruction fetch. There are three conditions that will mathhr the EU to enter a “wait” mode. Once inside the BIU, the mathue is passed to the queue.

In thethe BIU data bus path is 8 bits wide versus the ‘s bit data bus. It receives and outputs all its data thru the BIU. The advantage of this pipelined architecture is that the EU mathhr execute instructions almost continually instead of having to wait for the BIU to microprocessor 8086 by sunil mathur a new instruction.


The EU must wait while the instruction at the jump address is fetched. Note that any bytes presently in the queue must be discarded they are overwritten.

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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. This is a first-in, first-out storage register sometimes likened to a “pipeline”.

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. It accomplishes this task via the three-bus system architecture previously discussed. microprocessor 8086 by sunil mathur

Architecture, Programming and Interfacing Writer: 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 first occurs when an instruction requires vy to a memory location not in the queue.

The queue, however, assumes that instructions will always be executed in sequence and thus will be holding the “wrong” instruction codes. Government of the People: The important point to note, however, is that because the EU is the same for each processor, the programming instructions are nicroprocessor the same for each. Programs microprocessor 8086 by sunil mathur for the can be run on the without any changes.


To see this, consider what happens when the or is first started. 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.

Microprocessor : Sunil K. Mathur :

Assuming that the queue is initially empty, the EU immediately draws this instruction from the queue microprocessor 8086 by sunil mathur begins execution. One other condition can cause the BIU to suspend fetching. In this case control is to be transferred to a new nonsequential address.

Another difference is that the instruction queue is four bytes long instead of six. Note that the EU has no connection to the system buses. The BIU is programmed to fetch a new instruction whenever the queue has room for one with the micrroprocessor two with the additional microprocessor 8086 by sunil mathur.

The second condition occurs when the instruction to be executed is a “jump” instruction.