Personal Computer User Manual

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Functional Description
4
Every board is assigned two Ethernet Station Addresses. The address is
$0001AFXXXXX where XXXXX is the unique number assigned to each
interface. Each Ethernet Station Address is displayed on a label attached to
the PMC front-panel keep-out area.
In addition, LAN 1 Ethernet address is stored in the configuration area of
the NVRAM specified by the Boot ROM and in SROM.
VMEbus Interface
The VMEbus interface is provided by the Universe II ASIC. Refer to the
Universe II User’s Manual, as listed in Appendix C, Related
Documentation, for additional information.
Asynchronous Communications
The MVME5100 provides dual asynchronous debug ports. The serial
signals COM1 and COM2 are routed through appropriate EIA-232 drivers
and receivers to an RJ45 connector on the front panel (COM1) and an on-
board connector (COM2). The external signals are ESD protected.
Real-Time Clock & NVRAM & Watchdog Timer
The MVME5100’s design incorporates 32KB of non-volatile static RAM,
along with a real-time clock and a watchdog function an integrated device.
Refer to the M48T37V CMOS 32Kx8 Timekeeper SRAM Data Sheet, as
referenced in Appendix C, Related Documentation for additional
programming and engineering information.
Timers
Timers and counters on the MVME5100 are provided by the board’s
hardware (Hawk ASIC). There are four 32-bit timers on the board that may
be used for system timing or to generate periodic interrupts.
Interrupt Routing
Legacy interrupt assignment for the PCI/ISA Bridge is maintained to
ensure software compatibility between the MVME5100 and the
MVME2700 while in SBC mode.