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Functional Blocks
The DMAC interrupter is an edge-sensitive interrupter connected
2
to the DMAC.
The GCSR SIG3-0 interrupters are edge-sensitive interrupters
connected to the output of the signal bits in the GCSR.
The location monitor interrupters are edge-sensitive interrupters
connected to the location monitor bits in the GCSR.
The software 7-0 interrupters can be set by software to generate
interrupts.
The VMEbus IRQ7-1 interrupters are level-sensitive interrupters
connected to the VMEbus IRQ7-1 signal lines.
The interrupt handler provides all logic necessary to identify and
handle all local interrupts as well as VMEbus interrupts. When a
local interrupt is acknowledged, a unique vector is provided by the
chip. Edge-sensitive interrupters are not cleared during the
interrupt acknowledge cycle and must by reset by software as
required. If the interrupt source is the VMEbus, the interrupt
handler instructs the VMEbus master to execute a VMEbus IACK
cycle to obtain the vector from the VMEbus interrupter. The chip
connects to all signals that a VMEbus handler is required to drive
and monitor. On the local bus, the interrupt handler is designed to
comply with the interrupt handling signaling protocol of the
MC68040 microprocessor.
2-21
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