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 Hardware Questions

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Q:

What does microprocessor speed depend on?

Answer

the processing speed depends on DATA BUS WIDTH.

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Q:

In 8085 name the 16 bit registers?

Answer

Stack pointer and Program counter all have 16 bits.

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Q:

How many logical drives is it possible to fit onto a physical disk?

Answer

Maximum of 24 logical drives. The extended partition can only have 23 logical drives.

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Q:

What are the different hazards? How do you avoid them?

Answer

There are situations, called hazards, that prevent the next insturction in the instruction stream from executing during its designated clock cycle. hazards reduce the performance from the ideal speedup gained by pipelining.


There are three classes of Hazards:


1. Structural hazards: It arise from resource conficts when the hardware cannot support all possible combinations of instructions simultaniously in overlapped execution.


2. Data Hazards: It arise when an instruction depends on the results of previous instruction in a way that is exposed by the overlapping of instructions in the pipeline.


3.control hazards. it arise from the pipelining of branches and other instructions that chage the PC.

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Q:

Draw a Transmission Gate-based D-Latch?

Answer

The Transmission-Gate's input is connected to the D_LATCH data input (D), the control input to the Transmission-Gate is connected to the D-Latch enable inputs (EN) and the Transmission-Gate outputs is the D_LATCH output(Q)

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Q:

Can ROM be used as stack?

Answer

ROM cannot be used as stack because it is not possible to write to ROM.

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Q:

why 8085 processor, is called an 8 bit processor?

Answer

Because 8085 processor is 8 bit ALU (arithmetic logic review). Similarly 8086 processor has 16 bit ALU.

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Q:

Which processor structure is pipe lined?

Answer

All x86 processors have pipelined structure.

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