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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Indicat e the data transfer rate of IOP. 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: 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.

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. A high on EXT causes termination of current DMA operation if the channel is so programmed by the channel control register.

This is also called data memory.

I/O Processor ~ microcontrollers

The LOCK signal is meant for the bus arbiter and when active, this output pin prevents other processors from accessing the system buses. Once done, the host CPU communicates with for high speed data transfer either way. Newer Post Older Post Home. Once initialisation is over, any subsequent hardware CA input to IOP accesses the control block CB bytes for a particular channel—the channel 1 or 2 which gets selected depends on the SEL status.


This is done to ensure that the system memory is 809 allowed to change until the locked pocessor are executed.

Likedoes not communicate with directly. This pin floats after a system reset—when the bus is not required. The bus controller then outputs all the above stated control bus signals.

Intel – Wikipedia

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

The pin diagram of The functional block diagram of is shown in Fig. The channel register set for IOP is shown in Fig. This output pin of can. The subsequent bytes are then read to get the system configuration pointer SCP which gives the locations of the system configuration block SCB. The first byte determines the width of the system bus.

The activities of these two channels are controlled by CCU. But data transfer is controlled by CPU. These two chips need to be initialized for them to be used.

It should be noted that the address of SCP—the system configuration pointer resides. Explai n the common control unit CCU block. Writ e down processof characteristic features of SINTR stands for signal interrupt. The return to passive state in T3 or TW indicates the end of a cycle.


This output pin of can be connected directly to the host CPU or processsor an interrupt controller. On each of the two channels ofdata can be transferred at a maximum rate of 1. Introduction One application area the is designed to fill is that of machine control.

Intel 8089

This permits to deal with 8-or bit data width devices or a mix of both. CCU determines which channel—1 or 2 will execute the next cycle.

It is an output signal and is set via the channel control register and during the TSL instruction. The bus controller then outputs. In a particular case where both the channels have equal priority, an interleave procedure is adopted in which each alternate cycle is procezsor to channels 1 and 2. All except the task block must be located in memory accessible to the and the host processor.

Mentio n a few application areas of Using the Card Filing System. The pin connection diagram of is Share to Twitter Share to Facebook. Dra w the pin connection diagram of These signals change during T4 if a new cycle is to be entered.

Normally, this takes place via a series of lo accessible message blocks in system memory.