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One other condition can cause the BIU to suspend fetching. Programs written for the can be run on the without any changes. The queue, however, assumes that instructions will always be executed in sequence and thus will be holding the “wrong” instruction codes.
To see this, consider what happens when the or is first started. Architecture, Programming and Interfacing Writer: The only difference between an microprocessor and an microprocessor is the BIU. Note that the EU has no connection to the system buses.
Microprocessor /Architecture, Programming and interfacing: Sunil Mathur
Assuming that the queue is initially empty, the EU immediately draws this instruction from the queue and begins execution. 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. Government of the People: In thethe BIU data bus microprocessor 8086 by sunil mathur is 8 bits wide versus the ‘s bit data bus.
Microprocessor 8086 : Architecture, Programming And Interfacing
Another difference is that the instruction queue is four bytes long micrpprocessor of six. The second condition occurs when the instruction to be executed is a “jump” instruction. The important point to microprocessor 8086 by sunil mathur, however, is that because the EU is the same for each processor, the programming instructions are exactly the same for each.
It accomplishes this task via the three-bus system architecture previously discussed. The BIU is programmed to fetch a new instruction whenever the queue has room for one with the or two with the additional bytes. There are three conditions that will cause the EU to enter a “wait” mode. This is a first-in, first-out storage register sometimes likened to a “pipeline”.
It must recognize, decode, and microprocessor 8086 by sunil mathur program instructions fetched from the memory unit. The advantage of this pipelined architecture is that the EU can microprocessor 8086 by sunil mathur instructions almost continually instead of micgoprocessor to wait for the BIU to fetch a new instruction.
In this case control is to be transferred to a new nonsequential address.
Microprocessor : Sunil K. Mathur :
Register IP is incremented by 1 to prepare for the next instruction fetch. 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 microprocessor 8086 by sunil mathur instruction.
The EU must wait while the instruction at the jump address is fetched. It receives and outputs all its data thru the BIU.
Note that any bytes presently in the queue must be discarded they are overwritten. The first occurs when an instruction requires access to a memory location not in the queue. The EU receives program microprocessor 8086 by sunil mathur codes and data from the BIU, executes these instructions, and store the results in the general registers.
After waiting for the memory access, the EU can resume executing instruction codes from the queue and the BIU ssunil resume filling the queue.
Once inside the BIU, the instruction is passed to the queue.