Motorola MVME2400 Series Service Manual download pdf (Page 180)

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Hawk PCI Host Bridge & Multi-Processor Interrupt Controller

MASK MASK. Setting this bit disables any further interrupts

from this source. If the mask bit is cleared while the bit

associated with this interrupt is set in the IPR, the interrupt

request will be generated.

ACT ACTIVITY. The activity bit indicates that an interrupt

has been requested or that it is in-service. The ACT bit is

set to a one when its associated bit in the Interrupt Pending

POL POLARITY. This bit sets the polarity for external

interrupts. Setting this bit to a zero enables active low or

negative edge. Setting this bit to a one enables active high

or positive edge. Only External Interrupt Source 0 uses

this bit in this register.

SENSE SENSE. This bit sets the sense for external interrupts.

Setting this bit to a zero enables edge sensitive interrupts.

Setting this bit to a one enables level sensitive interrupts.

For external interrupt sources 1 through 15, setting this bit

to a zero enables positive edge triggered interrupts.

Setting this bit to a one enables active low level triggered

interrupts.

PRIOR PRIORITY. Interrupt priority 0 is the lowest and 15 is

the highest. Note that a priority level of 0 will not enable

interrupts.

VECTOR VECTOR. This vector is returned when the Interrupt

Acknowledge register is examined upon acknowledgment

of the interrupt associated with this vector.

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Motorola MVME2400 Series Service Manual Page 180