Epak Vectored Interrupt Request; Duart Interrupt Request (-Intp<5>); Vmebus Interrupts - Performance Computer PT-VME151A User Manual

[-SCINT] or the EPAK [-EPIRQ] signals drive the ACC interrupt input pin -LIRQ3
through signal line [-INTP<3>].

EPAK Vectored Interrupt Request

This interrupt is driven by the EPAK Vectored Interrupt Request signal [-EPVIR]. When
the 68040 acknowledges the interrupt the ACC asserts EPAK Vectored Interrupt Acknowl-
edge (-EPVIA) back to the EPAK module. The interrupt request is negated automatically
by logic on the EPAK that responds to the interrupt acknowledge (-EPVIA) generated by
the ACC.
The interrupt is enabled by setting the L4E bit in the ACC Local Interrupt Enable Register.
The current state of this signal can be read in the LI4 status bit of the ACC Local Interrupt
Status Register. The interrupt request level presented to the 68040 is determined by 4L2,
4L1, and 4L0 control bits in the ACC Local Interrupts 5 and 4 Control Register. The 4AV
bit in the ACC Local Interrupts 5 and 4 Control Register determines whether a "vectored"
or "auto-vectored" interrupt is presented to the 68040. The EPAK [-EPVIR] signal drives
the ACC interrupt input pin -LIRQ4 through signal line [-INTP<4>].
!
CAUTION: Due to the PT-VME151A/151AE hardware implementation the "vectored"
option must always be used for the ACC Local Interrupts 5 and 4 Control Register 4AV bit.
DUART Interrupt Request (-INTP<5>)
This interrupt is driven by the DUART Interrupt Request signal. When the 68040 acknowl-
edges the interrupt the ACC asserts an interrupt acknowledge (-INTA<5>) back to the
DUART. The interrupt request is negated by servicing the appropriate interrupt source in
the DUART.
The interrupt is enabled by setting the L5E bit in the ACC Local Interrupt Enable Register.
The current state of this signal can be read in the LI5 status bit of the ACC Local Interrupt
Status Register. The interrupt request level presented to the 68040 is determined by 5L2,
5L1, and 5L0 control bits in the ACC Local Interrupts 5 and 4 Control Register. The 5AV
bit in the ACC Local Interrupts 5 and 4 Control Register determines whether a "vectored"
or "auto-vectored" interrupt is presented to the 68040. The DUART IRQ pin drives the
ACC interrupt input pin -LIRQ5 through signal line [-INTP<5>].
!
CAUTION: Due to the PT-VME151A/151AE hardware implementation the "vectored"
option must always be used for the ACC Local Interrupts 5 and 4 Control Register 5AV bit.

VMEbus Interrupts

The VMEbus interrupts map directly onto the 68040 CPU interrupt levels. Each has its own
enable bit and each is always vectored. All VMEbus interrupts are level sensitive and not
latched, nor can their status be directly determined, with the exception or IRQ1*. See the
AVICS Technical Manual for more information on this exception.
The ACC VMEbus Interrupt Enable Register allows the individual interrupt request levels to be
enabled or disabled.
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Extensible Single Board Computer/Controller User's Manual 43
Performance Computer