Vmebus Interrupt Generation; Vmebus Reset Options; Pci Bios Functions - Xycom XVME-654 Manual

VMEbus Interrupt Generation

The XVME-654 can generate VMEbus interrupts on all seven levels. There is a unique
STATUS/ID associated with each level. Upper bits are programmed in the STATUS/ID
register. The lowest bit is cleared if the source of the interrupt is a software interrupt, and
set for all other interrupt sources. Consult the Universe User's Manual for a more in-
depth explanation.

VMEbus Reset Options

The XVME-654 resets the VMEbus according to the following conditions:
1. Power on always causes the Universe chip to assert the VMEbus reset signal.
2. The Universe chip may reset the VMEbus by asserting a software bit.
3. The Toggle reset switch can reset the VMEbus when SW1-position 2 is closed.
You can also use the XVME-654 toggle switch to reset only the local XVME-654.

PCI BIOS Functions

Special PCI BIOS functions provide a software interface to the Universe chip, providing
the PCI-to-VMEbus interface. These PCI BIOS functions are invoked using a function
and subfunction code. Users set up the host processor's registers for the function and
subfunction desired and call the PCI BIOS software. The PCI BIOS function code is
B1h. Status is returned using the Carry flag ([CF]) and registers specific to the
subfunction invoked.
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Caution
IRQ10 is defined for the Abort toggle switch.
Technical Note
If SW1-position 1 is closed, the entire XVME-654 is reset.
Technical Note
SW1-position 2 must be open. SW1-position 5 must be closed.
Chapter 4 – Programming
4-7