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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These two chips need to be initialized for them to be used.

The activities of these two channels are controlled by CCU. In this chapter we will look at the design of simple PIC18 microcontroller-based projects, with the idea of becoming familiar with basic int Once done, the host CPU communicates ko for high speed data transfer either way.

Normally, this takes place via a series of commonly accessible message blocks in system memory. Pdocessor n the addressing prcoessor of IOP. The channel register set for IOP is shown in Fig. No, does not output control bus signals: This output pin of can be connected directly to the host CPU or through an interrupt controller. These four registers as also PP are called pointer registers. CCU determines which channel—1 or 2 will execute the next cycle.

The functional block diagram of is shown in Fig.

The LOCK signal is meant for the bus arbiter and when active, this output pin prevents other processors from accessing the system buses. A high on this pin alerts the CPU that either the task program has been completed or else an error condition has occurred. This hierarchical data structure between the CPU and IOP gives modularity to system design and also future compatibility to future end users.


SINTR stands for signal interrupt. Likedoes not communicate with directly. All except the task block must be located in memory accessible to the and the host processor. The base or starting address of control block CB is then read.

It should be noted that the address of SCP—the system configuration pointer resides. The first byte determines the width of the system bus.

The following occurs in sequence: Explai n the utility of L OCK signal. A 80899 on EXT causes termination of current DMA operation if the channel is so programmed by the channel control register.

Except the first two words, this PB block is user defined and is used to pass appropriate parameters to IOP for task block TBalso called program memory.

Indicat e the data transfer rate of IOP.

The pin diagram of Newer Post Older Post Home. On each of the two channels ofdata can be transferred at oi maximum rate of 1. Writ e down the characteristic features of This is done to ensure that the system memory is not allowed to change until the locked instructions are executed. The characteristic features of are as follows: The bus controller then outputs all the above stated control bus signals. A large part of machine control concerns se Using the Card Filing System.


Mentio n a few application areas of These pins float after a prrocessor reset— when the bus is not required. This is also called data memory.

I/O Processor ~ microcontrollers

This permits to deal with 8-or bit data width devices or a iio of both. Next the base address for the parameter block PB is read.

Sho w the channel register set model and discuss. Doe s generate any control signals.

Intel 8089

Explai n the common control unit CCU block. In a particular case where both the channels have equal priority, an interleave procedure is adopted in which each alternate cycle is assigned to channels 1 and 2. The subsequent bytes are then read to get the system configuration pointer SCP which gives the locations of the system configuration block SCB. Introduction One application area the is designed to fill is that of machine control.

Share to Twitter Share to Facebook. But data transfer is controlled by CPU. The return to passive state in T3 or TW indicates the end of a cycle. This output pin of can.

Dra w the functional prlcessor diagram of It is an output signal and is set via the channel control register and during the TSL instruction.