MA82380 View Datasheet(PDF) - Intel

Part Name

Description

Manufacturer

MA82380

HIGH PERFORMANCE 32-BIT DMA CONTROLLER WITH INTEGRATED SYSTEM SUPPORT PERIPHERALS

Intel 

M82380

1 1 3 INTERRUPT CONTROLLER

The M82380 has the equivalent of three enhanced

M8259A Programmable Interrupt Controllers These

controllers can all be operated in the Master mode

but the priority is always as if they were cascaded

There are 15 interrupt request inputs provided for

the user all of which can be inputs from external

slave interrupt controllers Cascading M8259As to

these request inputs allows a possible total of 120

external interrupt requests Figure 4 is a block dia-

gram of the M82380 Interrupt Controller

Each of the interrupt request inputs can be individu-

ally programmed with its own interrupt vector allow-

ing more flexibility in interrupt vector mapping than

was available with the M8259A An interrupt is pro-

vided to alert the system that an attempt is being

made to program the vectors in the method of the

M8259A This provides compatibility of existing soft-

ware that used the M8259A with new designs using

the M82380

In the event of an unrequested or otherwise errone-

ous interrupt acknowledge cycle the M82380 Inter-

rupt Controller issues a default vector This vector

programmed by the system software will alert the

system of unsolicited interrupts of the M80386

The functions of the M82380 Interrupt Controller are

identical to the M8259A except in regards to pro-

gramming the interrupt vectors as mentioned above

Interrupt request inputs are programmable as either

edge or level triggered and are software maskable

Priority can be either fixed or rotating and interrupt

requests can be nested

Figure 4 M82380 Interrupt Controller Block Diagram

271070 – 5

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