Motorola MVME147S MPU VME Module

Features

The MVME147S features include

MC68030 microprocessor

Floating point coprocessor (MC68882)

Shared DRAM with parity (no parity on MVME147SRF)

Four serial ports with RS-232C buffers

Small Computer System Interface (SCSI) bus interface with DMA channel

Timer/calendar with battery backup

2K by 8 CMOS RAM with battery backup

Four ROM/PROM/EPROM/EPROM sockets (16-bit wide)

VMEbus interrupter

VMEbus system controller functions

VMEbus master interface (A32/D32. A24/D16 compatible)

VMEbus Requestor

SCON, DUAL, FAIL and STATUS status indicators

Reset and abort switches

Centronics Printer Port

Two 16-bit ticking timers for periodic interrupts

Watchdog timer

Ethernet transceiver interface (except MVME147SRF)

Cooling Requirements

Motorola VME modules are specified, designed, and tested to operate with forced air cooling from

Reliable operation over the incoming air temperature range of 0 degrees Celsius to 55 degrees Celsius (32 degrees Fahrenheit to 131 degrees Fahrenheit).

Temperature qualification was performed in a standard Motorola VMEsystem 1000 chassis.

A 25-watt load board was inserted in two card slots, one on each side, adjacent to the board under test to simulate a high power density system configuration.

Three axial fans, each rated at 100 CFM, were mounted directly below the MVME card box.

The temperature of the incoming airflow was measured between the fan assembly and the card box, where the airflow first encountered the module under test.

The test software is executed when the module is subjected to a change in ambient temperature. The test software is executed when the ambient temperature changes.

Case temperatures of critical high power density integrated circuits are monitored to ensure that component supplier specifications are not exceeded.

While the exact amount of airflow required for cooling depends on the ambient air temperature as well as the type, number, and location of boards and other heat sources.

However, typically as little as 10 CFM of airflow through the module is sufficient for cooling.

In environments with lower maximum ambient temperatures, less airflow is required to cool the module.

Under more favourable thermal conditions, increased airflow will allow the module to operate reliably at ambient temperatures above 55 degrees Celsius.

It is important to note that in addition to the rated CFM of the air pusher, there are several factors that determine the actual amount of air flowing through the module.

FCC Compliance

These VME modules (MVME147S) have been tested in an FCC-compliant enclosure and meet the requirements for a Class A device.

FCC compliance is achieved under the following conditions:

Shielded cables are used for all external I/O ports

The cable shield is connected to ground through a metal-shell connector bonded to the front panel of the conductive module

Chassis rails are connected to earth ground

Front panel screws are tightened

The above conditions must be met in order to minimise RF emissions; failure to do so will affect the FCC compliance of the equipment containing the module.

General Description

The MVME147S is a dual-height VME module best suited for use in 32-bit VMEbus systems using both P1 and P2 backplanes.

It is a powerful module with large on-board shared RAM, a serial port, and a Centronics printer port.

The module provides a SCSI bus controller with DMA, floating point coprocessor, tick timer, and watchdog timer,

timer clock/calendar with battery backup, 2KB of static RAM with battery backup, four ROM slots, a serial interface, and a printer port.

In addition, the MVME147S provides 2KB of static RAM with battery backup, four ROM sockets, and an A32/D32 VMEbus interface with system controller functions.

The MVME147S can operate as part of a VMEbus system with other VME modules such as RAM modules, CPU modules, graphics modules and analogue I/O modules.

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