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Functional Blocks
Each of the 31 interrupts can be enabled to generate a local bus interrupt at
2
any level. For example, VMEbus IRQ5 can be programmed to generate a
level 2 local bus interrupt.
The VMEbus AC fail interrupter is an edge-sensitive interrupter connected
to the VMEbus ACFAIL signal line. This interrupter is filtered to remove
the ACFAIL glitch which is related to the BBSY glitch.
The SYS fail interrupter is an edge-sensitive interrupter connected to the
VMEbus SYSFAIL signal line.
The write post bus error interrupter is an edge-sensitive interrupter
connected to the local-bus-to-VMEbus write post bus error signal line.
The VMEbus IRQ1 edge-sensitive interrupter is an edge-sensitive
interrupter connected to the VMEbus IRQ1 signal line. This interrupter is
used when one of the tick timers is connected to the IRQ1 signal line.
When this interrupt is acknowledged, the vector is provided by the
VMEchip2 and a VMEbus interrupt acknowledge is not generated. When
this interrupt is enabled, the VMEbus IRQ1 level-sensitive interrupter
should be disabled.
The VMEchip2 VMEbus interrupter acknowledge interrupter is an edge-
sensitive interrupter connected to the acknowledge output of the VMEbus
interrupter. An interrupt is generated when an interrupt on the VMEbus
from VMEchip2 is acknowledged by a VMEbus interrupt handler.
The tick timer interrupters are edge-sensitive interrupters connected to the
output of the tick timers.
The DMAC interrupter is an edge-sensitive interrupter connected 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 -IRQ1 signal lines.
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2-19
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