VMEbus Interrupts
6-21
For the BajaPPC-750 application, the Universe is configured to send VME inter-
rupts as LINT outputs to the interrupt controller programmable logic device
(PLD), which interrupts the CPU via the 750_INT* line (see Section 3.4).
6.5.1 Interrupter
The Universe interrupter provides an 8-bit status/ID to the interrupt handler. The
upper seven bits are programmed from the STATID register. The lowest bit is
cleared for software interrupts and set for all other interrupt sources. Software
interrupts are given the highest priority.
6.5.2 Interrupt Handler
In the event of a normal VMEbus interrupt, the Universe interrupt handler gener-
ates an acknowledge (IACK) cycle and output. Upon completion of the cycle, it
releases the VMEbus, allowing the PCI resource to read the interrupt vector and
service the output. Software interrupts are release-on-acknowledge (ROAK). Hard-
ware and internal interrupts are release-on-register-access (RORA).
VME_SW7 -
VME_SW1
VME software interrupt mask.
Binary 0=masked, 1=enabled, transition from zero to one generates inter-
rupt at the corresponding level.
MBOX3 - MBOX0
Mailbox interrupt mask.
Binary 0=masked, 1=enabled.
VME_SW_INT
VME software interrupt mask.
Binary 0=masked, 1=enabled. Transition from zero to one asserts the
interrupt (power-up option).
VME_VERR
VMEbus error interrupt mask.
Binary 0=masked, 1=enabled.
VME_LERR
PCI bus error interrupt mask.
Binary 0=masked, 1=enabled.
VME_DMA
VME DMA interrupt mask.
Binary 0=masked, 1=enabled.
LINT7 - LINT0
LINTx interrupt mask.
Binary 0=masked, 1=enabled.
Содержание BajaPPC-750
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