Artesyn BajaPPC-750, User Manual

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0002M621-15
6
VMEbus Interface
The Tundra Universe II CA91C142 provides a single-chip, 64-bit, VMEbus to PCI
interface for the BajaPPC-750. The Universe is optimized to support high-speed
processors and allows for numerous bus masters to share the resources on the bus.
The VMEbus supports up to 21 boards. Artesyn tests all of its VMEbus boards in a
fully-populated backplane.
6.1 Features
The BajaPPC-750 VMEbus interface has the following features:
Address The VMEbus interface uses 32 address lines for a total of 4 gigabytes of
VMEbus address space. The VMEbus short, standard, and extended
address modes are supported, and use 16, 24, and 32 address lines respec-
tively.
As VMEbus master, the BajaPPC-750 can access short, standard, and
extended space addresses. As a VMEbus slave, the BajaPPC-750 can
respond to the full 32-bit range of addresses on the VMEbus. The default
master and slave images are programmable via parameters defined in the
Artesyn monitor NVRAM configuration groups.
Data The VMEbus interface uses 32 data lines and 32 address lines to support
8-, 16-, 24-, 32-, or 64-bit data transfers.
Interrupts The Universe handles the seven VMEbus interrupts.
Mailboxes /
Location Monitor
The Universe has four 32-bit mailboxes to facilitate interrupt routines for
both the VMEbus and PCI bus. In addition, it supports a VMEbus loca-
tion monitor to broadcast events across the VME backplane.
System Controller The BajaPPC-750 may be configured as the VMEbus system controller to
perform the necessary system controller functions: driving SYSCLK,
BCLR, and SYSRESET, and providing bus watchdog and bus arbitration.