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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Dra w the pin connection diagram of The pin connection diagram of is shown in Fig. Writ e down the characteristic features of The characteristic features of are as follows: On each of the two channels ofdata can be transferred at a maximum rate of 1. Mentio n a few application areas of A few of the application areas of are: These two chips need to be initialized for them to be used.

But data transfer is controlled by CPU. Once done, the host CPU communicates procsesor for high speed data transfer either way.

No, does not output control bus signals: The bus controller then outputs. These signals change during T4 if a new cycle is to be entered. The return to passive state in T3 or TW ioo the end of a cycle.

These pins float after a system reset— when the bus is not required.

Intel 8089

Explai n the utility of L OCK signal. It is an output signal and is set via the channel control register and during the TSL instruction. This pin floats after a system reset—when the bus is not required. The LOCK signal is meant for the bus pricessor and when active, this output pin prevents other processors from accessing the system buses. This is done to ensure that the system memory is not allowed to change until the locked instructions are executed.


A high on EXT causes termination of current DMA operation if the channel is so programmed by the channel control register. The activities of these two channels are controlled by CCU. CCU determines which channel—1 or 2 will execute the next cycle.

In a particular case where both the channels have procdssor priority, an interleave procedure is adopted in which each alternate cycle is assigned to channels 1 and 2. This permits to deal with 8-or bit data width devices or a mix of both. SINTR stands for signal interrupt. Likedoes not communicate with directly. Normally, this takes place via a series of commonly accessible message blocks in system memory. SINTR pin is another method of such communication.

This output pin of can. A high on this pin alerts the CPU that either the task program has been completed or else an error condition has occurred. The following occurs 889 sequence: The first byte determines the width of the system bus. The subsequent bytes are then read to get the system configuration pointer SCP which gives the locations of the system configuration processorr SCB.

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. All except the task block must be located in memory accessible to the and the host processor. Once initialisation is over, any subsequent hardware CA input to IOP processoe the control block CB bytes for a particular channel—the channel 1 or 2 which gets selected depends on the SEL status.

Next processro base address for the parameter block PB is read. This is also called data memory. 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. This hierarchical data structure between pfocessor CPU and IOP gives modularity to system design and also future compatibility to future end users.


Sho w the channel register set model and discuss. The channel register set for IOP is shown in Fig.

Intel – Wikipedia

These four registers as also PP are called pointer registers. Dra w the functional block diagram of The functional ko diagram of is shown in Fig.

Indicat e the data transfer rate of IOP. Doe s generate any control signals.

The bus controller then outputs all the above stated control bus signals. Explai n the common control unit CCU block. This output pin of can be connected directly to the host CPU or through an interrupt controller.

It should be noted that the address of SCP—the system configuration pointer resides in ROM and is the only one to have fixed address in the hierarchy. Mentio n the addressing modes of IOP.

Share to Twitter Share to Facebook. Newer Post Older Post Home. The pin diagram of Subtraction Subtraction can be done by taking the 2’s complement of the number to be subtracted, the subtrahend, and adding i Using the Card Filing System.

Introduction One application area the is designed to fill is that 808 machine control. A large part of machine control concerns se In this chapter we will look at the design of simple PIC18 microcontroller-based projects, with the idea of becoming familiar with basic int The pin connection diagram of is