Motorola MVME2400 Series Wartungshandbuch PDF herunterladen (Seite 282)

4-6 Computer Group Literature Center Web Site

Universe II (VMEbus to PCI) Chip

Interrupter and Interrupt Handler

Interrupter

The Universe II interrupt channel provides a flexible scheme to map

interrupts to either the PCI bus or VMEbus interface. Interrupts are

generated from either hardware or software sources (Refer to Interrupter

in the Universe II User Manual for a full description of hardware and

software sources.). Interrupt sources can be mapped to any of the PCI bus

or VMEbus interrupt output pins. Interrupt sources mapped to VMEbus

interrupts are generated on the VMEbus interrupt output pins VIRQ#[7:1].

When a software and hardware source are assigned the same VIRQn# pin,

the software source always has higher priority.

Interrupt sources mapped to PCI bus interrupts are generated on one of the

INT#[7:0] pins. To be fully PCI compliant, all interrupt sources must be

routed to a single INT# pin.

For VMEbus interrupt outputs, the Universe II interrupter supplies an 8-bit

STATUS/ID to a VMEbus interrupt handler during the IACK cycle, and

optionally generates an internal interrupt to signal that the interrupt vector

has been provided. (Refer to VMEbus Interrupt Generation in the

Universe II User Manual.)

Interrupts mapped to PCI bus outputs are serviced by the PCI interrupt

controller. The CPU determines which interrupt sources are active by

reading an interrupt status register in the Universe II. The source negates

its interrupt when it has been serviced by the CPU. (Refer to PCI Interrupt

Generation in the Universe II User Manual.)

VMEbus Interrupt Handling

A VMEbus interrupt triggers the Universe II io generate a normal VMEbus

IACK cycle and generate the specified interrupt output. When the IACK

cycle is complete, the Universe II releases the VMEbus and the interrupt

vector is read by the PCI resource servicing the interrupt output. Software

interrupts are ROAK, while hardware, and internal interrupts are RORA.

1 2 ... 277 278 279 280 281 282 283 284 285 286 287 ... 353 354

Keine Kommentare

Motorola MVME2400 Series Wartungshandbuch Seite 282