MOTOROLA MVME712M Transition Module.

MVME712M  Transition Module.

The modules are used as the interface between the following families of Motorola

VMEmodules, and their peripheral devices:

MVME147 MPU VMEmodule

MVME162 Embedded Controller

MVME167 Single Board Controller (SBC)

MVME177 Single Board Controller (SBC)

MVME1600 Single Board Computer (SBC)

MVME2600 Single Board Computer (SBC)

MVME2700 Single Board Computer (SBC)

MVME3600 VME Processor Module

MVME4600 VME Processor Module

This chapter provides general information about the MVME712M

Transition Module and the P2 adapter board, specifications, cooling

requirements, and FCC compliance.

Description

The MVME712M is an I/O transition module for Motorola’s MPU

VMEmodule, VME Processor Module, Embedded Controller, and Single

Board Computer (SBC) families of processor modules, referred to in this

manual as MVMExxxx.

The MVME712M is used as an interface between the processor module

and its peripheral devices. The purpose of this module is to provide rear

panel industry-standard connectors that simplify external customer cable

requirements.

The P2 adapter board and cables are supplied for interconnection between

the MVME712M and the MVMExxxx. The P2 adapter assembly routes the

I/O signals and grounds from the P2 connector on the chassis backplane,

at the VMEmodule MPU connection, to the MVME712M.

The MVME712M routes the signals to four serial ports, implemented with

four industry standard DB-25 connectors on its front panel. The serial ports

may be configured for EIA-232-D DTE or DCE through jumper

arrangements on the MVME712M.

The MVME712M front panel also has an Ethernet port, a SCSI port, and

a printer port. In addition, the MVME712M routes the EIA-232-D port 2

signals to an internal modem.

MVME712M Transition Module

The features of the MVME712M include:

Four 25-pin multiprotocol EIA-232-D serial ports

(through P2 adapter)

One independent printer port (through P2 adapter)

Small Computer Systems Interface (SCSI) shielded connector bus

interface (through P2 adapter) for connection to internal and

external devices

Green LED on module to indicate terminator power

Yellow LED on module to indicate transceiver power

SCSI terminating resistors mounted in sockets for end of cable or

middle of cable configuration

Modem connection on module

Radio Frequency Interference (RFI) protection on front panel

Electrostatic Discharge (ESD) protection on front panel

P2 Adapter Board

The MVME712M requires the use of the P2 adapter board. The features of

the P2 adapter board include:

A connector that permits SCSI cable connection to other SCSI

devices and/or to MVME712M through a flat ribbon cable

SCSI terminating resistors mounted in sockets, for end of cable or

middle of cable configuration

Terminator power developed on the P2 adapter from the

+5 Vdc on connector P2. and fused (1 A) on the P2 adapter

A connector that interfaces the EIA-232-D ports, printer port, SCSI,

and Ethernet signals to the MVME712M

he following table lists the general specifications for the MVME712M

Transition Module. The subsequent sections detail cooling requirements

and FCC compliance.

A complete functional description of the MVME712M appears in Chapter

Motorola VMEmodules are specified, designed, and tested to operate

reliably with an incoming air temperature range from 0 degrees C to 55

degrees C (32 degrees F to 131 degrees F) with forced air cooling.

Temperature qualification is performed in a standard Motorola

VMEsystem 1000 chassis. Twenty-five watt load boards are inserted in the

two card slots, one on each side, adjacent to the board under test to

simulate a high power density system configuration. An assembly of three

axial fans, rated at 71 CFM per fan, is placed directly under the MVME

card cage. The incoming air temperature is measured between the fan

assembly and the card cage where the incoming airstream first encounters

the module under test.

Test software is executed as the module is subjected to ambient

temperature variations. Case temperatures of critical, high power density

integrated circuits are monitored to ensure component vendors

specifications are not exceeded.

While the exact amount of airflow required for cooling depends on the

ambient air temperature and the type, number, and location of boards and

other heat sources, adequate cooling can usually be achieved with 5 CFM

flowing over the module. Less air flow is required to cool the module in

environments having lower maximum ambients.

Under more favorable thermal conditions it may be possible to operate the

module reliably at higher than 55 degrees C with increased air flow. It is

important to note that there are several factors, in addition to the rated

CFM of the air mover, which determine the actual volume of air flowing

over a module

The MVME712M Transition Module was tested in an FCC-compliant

chassis, and meets the requirements for Class A equipment. FCC

compliance was achieved under the following conditions:

Shielded cables on all external I/O ports

Cable shields connected to earth ground via metal shell connectors

bonded to a conductive module front panel

Conductive chassis rails connected to earth ground; this provides

the path for connecting shields to earth ground

Front panel screws properly tightened

For minimum RF emissions, it is essential that the conditions above be

implemented. Failure to do so could compromise the FCC compliance of

the equipment containing the modules.