Motorola MVME162 Embedded Controller

MVME162  Embedded Controller

Features of the MVME162 include:

25MHz 32-bit Microprocessor: either an MC68LC040 Enhanced 32-bit

Microprocessor with 8KB of cache and MMU, or an optional 25MHz

MC68040 32-bit Microprocessor with 8KB of cache, MMU, and FPU

1MB, 4MB, or 8MB of shared Dynamic Random Access Memory (DRAM)

with programmable parity

512KB of Static Random Access Memory (SRAM) with battery backup

One JEDEC standard 32-pin PLCC EPROM socket (EPROMs may be

shipped separately from the MVME162)

1MB Flash memory: either one Intel 28F008SA (for older boards) or four

Intel 28F020s (for newer boards)

Four 32-bit programmable timers and programmable Watchdog Timer

(MCchip)

Two 32-bit programmable timers and programmable Watchdog Timer

(optional VMEchip2)

8K by 8 Non-Volatile Random Access Memory (NVRAM) and Time of

Day (TOD) clock with battery backup (Thompson MK48T08)

Input/Output– Two serial ports (one EIA-232-D DCE; one EIA-232-D or EIA-530

DCE/DTE) – Serial port controller (Zilog Z85230)– Optional Small Computer Systems Interface (SCSI) bus interface with

32-bit local bus burst Direct Memory Access (DMA) (NCR 53C710

controller)– Optional LAN Ethernet transceiver interface with 32-bit local bus

DMA (Intel 82596CA controller)– Four MVIP IndustryPack interfaces

VMEbus interface (VMEchip2)—non-VMEbus version optional– VMEbus system controller functions– VMEbus interface to local bus (A24/A32. D8/D16/D32

(D8/D16/D32/D64BLT) (BLT = Block Transfer)– Local bus to VMEbus interface (A16/A24/A32. D8/D16/D32)– VMEbus interrupte

VMEbus interrupt handler– Global CSR for interprocessor communications– DMA for fast local memory-VMEbus transfers (A16/A24/A32.

D16/D32[D16/D32/D64BLT])

Switches and Light-Emitting Diodes (LEDs)– Two pushbutton switches (ABORT and RESET)– Eight LEDs (FAIL, STAT, RUN, SCON, LAN, FUSE, SCSI, and VME)

Specifications

Table 1-2. MVME162 Specifications, lists the specifications for an MVME162

without IndustryPacks. The subsequent sections detail cooling requirements

and FCC compliance.

Cooling Requirements

The Motorola MVME162 Embedded Controller is specified, designed, and

tested to operate reliably with an incoming air temperature range from 0° to

55° C (32° to 131° F) with forced air cooling at a velocity typically achievable

by using a 100 CFM axial fan.  Temperature qualification is performed in a

standard Motorola VMEsystem 3000 chassis.  Twenty-five watt load boards

are inserted in 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 100 CFM per fan, is placed directly under the VME

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

assembly and the card cage, where the incoming airstream first encounters the

controller under test.  Test software is executed as the controller 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 10 CFM

and 490 LFM flowing over the controller.  Less airflow is required to cool the

controller in environments having lower maximum ambients.  Under more

favorable thermal conditions, it may be possible to operate the controller

reliably at higher than 55° C with increased airflow.  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 and speed of air flowing over the controller.

Special Considerations for Elevated Temperature Operation

The following information is for users whose applications for the MVME162

may subject it to high temperatures.

The MVME162 uses commercial grade devices.  Therefore, it can operate in an

environment with ambient air temperatures from 0° C to 70° C.  Several factors

influence the ambient temperature seen by components on the MVME162.

Among them are inlet air temperature; air flow characteristics; number, types,

and locations of IndustryPack (IP) modules; power dissipation of adjacent

boards in the system, etc.

A temperature profile of the MVME162-023 was developed in an MVME945

12-slot VME chassis.  This board was loaded with one GreenSpring IP-Dual

P/T module (position a) and three GreenSpring IP-488 modules (positions b,

c, and d).  One twenty-five-watt load board was installed adjacent to each side

of the board under test.  The exit air velocity was approximately 200 LFM

between the MVME162 and the IP-Dual P/T module.  Under these conditions,

a 10° C rise between the inlet and exit air was observed.  At 70° C exit air

temperature (60° C inlet air), the junction temperatures of devices on the

MVME162 were calculated (from the measured case temperatures) and did

not exceed 100° C.

The following are some steps that the user can take to help make elevated

temperature operation possible:

1. Position the MVME162 board in the chassis for maximum airflow over the