In the following figure outline the sequence of events which takes place in bus
ID: 3577133 • Letter: I
Question
In the following figure outline the sequence of events which takes place in bus arbitration from the time the interface device requests the bus to the time that CPU gains the control of the bus again. What is memory-mapped I/O? Name the steps in an instruction cycle. Define "addressing modes" In the following instructions identify, immediate, register direct, and register indirect addressing modes. What is the difference between a microprocessor and a microcontroller? What is the term used for a computer which uses microprogramming for it control unit? Briefly explain the term "Harvard Architecture". Briefly explain the term "Pipelining". What type of control unit is used in RISC? Briefly explain the function of the status register in a computer. Suppose R4 = 100, R6 = 50. What happens as the result of the execution of the following instruction? What happens as the result of the execution of the following instruction?Explanation / Answer
Answer
8. 1. Interface device request for the BUS
2. CPU gives control of BUS to the requesting interface device after checking availability
3. the requesting interface device sends acknowledgement to the CPU that it has received the BUS control
4. the interface device release the BUS control to the CPU after it is done with it.
9.
Memory mapped I/O is one of the methods of performing input-output operation among the CPU and peripheral devices in a computer.This method uses the same address space to address both memory and I/O devices. The memory and registers of the I/O devices are mapped to the address values. So when an address is accessed by the CPU, it may refer to a portion of physical RAM, however, it can also refer to memory of the I/O device. Thus, the CPU instructions which is being used to access the memory can also be used for accessing devices.
10.
Names of steps in instruction cycle are as below:
i. Initiating the cycle
ii. fetching the instruction
iii. decoding the instruction
iv. reading the effective address
v. executing the instruction
11.
Addressing modes is defined as the term that refers to the way in which the operand of an instruction is specified. Information contained in the instruction code can be the value of the operand or the address of the result/operand.
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