Motorola Single Board Computer, MVME5100 VMEbus Interface, Asynchronous Communications, Timers

4

Functional Description

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.

4-8 Computer Group Literature Center Web Site