Description

MVME162-043: Features, Cooling Requirements & Special Temperature Considerations

Features

Features of the MVME162-043 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 interrupter
- 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)

Cooling Requirements

The Motorola MVME162-043 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 MVME162-043 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.

MVME162-043 PDF

MVME162-043

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