Installing the MVME2100 Hardware
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Installation Considerations
The MVME2100 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 MVME2100 may not function properly if the main board is not
properly connected to connectors P1 and P2 on the VMEbus backplane.
Regardless of whether the MVME2100 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 MVME2100 tries to access off-board resources that do not respond
to its cycle, and the MVME2100 is not the system controller, and the
system does not have a global bus time-out, the MVME2100 waits
indefinately 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: when the MVME2100 is not the system controller and
there is no global bus time-out elsewhere in the system.
Multiple MVME2100 boards may be installed in a single VME chassis.
Each must have a unique Universe address. Other MPUs on the VMEbus
can interrupt, disable, communicate with, and determine the operational
status of the processor(s). One register of the Universe set includes four
bits that function as location monitors to allow one MVME2100 processor
to broadcast a signal to any other MVME2100 processor. All eight
registers are accessible from any local processor as well as from the
VMEbus.
