microprocessor performance may be seriously overshadowed by the constraints of traditional on- intelligent I/O subsystems. The Intel I/O processor is. The IO processor IOP is designed to handle the tasks involved in IO from CS at Shri Ramdeobaba Kamla Nehru Engineering College. Introduce the purpose, features and terminology of the Intel lOP (I/O. Processor). Provide reference information on the syntax and semantics of the

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The pin connection diagram of is shown in Fig. The functional block diagram of is shown in Fig. The bus controller then outputs all the above stated control bus signals. Writ e down the characteristic features of The LOCK signal is meant for the bus arbiter and when active, this output pin prevents other processors from accessing the system buses. The bus controller then outputs. A high on EXT causes termination of current DMA operation if the channel is so programmed by the channel control register.

The return to passive state in T3 or TW indicates the end of a cycle.

I/O Processor ~ microcontrollers

The activities of these two channels are controlled by CCU. Mentio n the addressing modes il IOP. Sho w the channel register set model and discuss.


These four registers as also PP are called pointer registers. It should be noted that the address of SCP—the system configuration pointer resides.

In this chapter we will look at the design of simple PIC18 microcontroller-based projects, with the idea of becoming familiar with basic int Newer Post Older Post Home. All except the task block must be located in memory accessible to the and the host processor.

A high on this pin alerts the CPU that either the task program has been completed or else an error condition has occurred. The subsequent bytes are then read to get the system configuration pointer SCP pprocessor gives the locations of the system configuration block SCB.

Mentio n a few application areas of Subtraction Subtraction can be done by taking the 2’s complement of the number to be subtracted, the subtrahend, and adding i No, does not output control bus signals: This output pin of can. These pins float provessor a system reset— when the bus is not required.

Next the base address for the parameter block PB is read. But data transfer is controlled by CPU. The channel register set for IOP is shown in Fig.


Intel 8089

This hierarchical data structure between the CPU and IOP gives modularity to system design and also future compatibility to future end users.

These two chips need to be initialized for them to be used. Introduction One application area the is designed to fill is that of machine control.

These signals change during T4 if a new cycle is to be entered. This is done to ensure that the 8098 memory is not allowed to change until the locked instructions are executed. Once done, the host CPU communicates with for high speed data transfer processlr way. CCU determines which channel—1 or 2 will execute the next cycle.

A few of the application areas of are: This pin floats after a system reset—when the bus is not required. It is an output signal and is set via the channel control register and during the TSL instruction. A large part of machine control concerns se The characteristic features of are as follows: The pin diagram of On each of processorr two channels ofdata can be transferred at a maximum rate of 1.