Installation Considerations - Motorola AltiVec MVME5100 Series Installation & Use Manual

Hardware Preparation and Installation
1

Installation Considerations

1-4
The MVME5100 draws power from the VMEbus backplane connectors
P1 and P2. Connector P2 is also used for the upper 16 bits of data in 32-bit
transfers, and for the upper 8 address lines in extended addressing mode.
The MVME5100 may not function properly without its main board
connected to VMEbus backplane connectors P1 and P2.
Whether the MVME5100 operates as a VMEbus master or as a VMEbus
slave, it is configured for 32 bits of address and 32 bits of data (A32/D32).
However, it handles A16 or A24 devices in the appropriate address ranges.
D8 and/or D16 devices in the system must be handled by the processor
software.
If the MVME5100 tries to access off-board resources in a nonexistent
location and if the system does not have a global bus time-out, the
MVME5100 waits forever for the VMEbus cycle to complete. This will
cause the system to lock up. There is only one situation in which the system
might lack this global bus time-out; that is when the MVME5100 is not the
system controller and there is no global bus time-out elsewhere in the
system.
Note Software can also disable the bus timer by setting the appropriate
bits in the Universe II VMEbus interface.
Multiple MVME5100 boards may be installed in a single VME chassis;
however, each must have a unique Universe II address. Other MPUs on the
VMEbus can interrupt, disable, communicate with, and determine the
operational status of the processor(s).
Computer Group Literature Center Web Site