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Board Level Hardware Description

Data Bus Structure

The local data bus on the MVME166 is a 32-bit synchronous bus that is based on the MC68040 bus, and supports burst transfers and snooping. The various local bus master and slave devices use the local bus to communicate. The local bus is arbitrated by priority type arbiter and the priority of the local bus masters from highest to lowest is: 82596CA LAN, CD2401 serial (through the PCCchip2), 53C710 SCSI, VSB, VMEbus, and MPU. In the general case, any master can access any slave; however, not all combinations pass the common sense test. Refer to the MVME166/MVME167/MVME187 Single Board Computers Programmer’s Reference Guide and to the user’s guide for each device to determine its port size, data bus connection, and any restrictions that apply when accessing the device.

MC68040 MPU

The MC68040 processor is used on the MVME166. The MC68040 has on-chip instruction and data caches and a floating point processor. Refer to the M68040 user’s manual for more information.

Flash Memory and Download EPROM

The MVME166 includes four 28F020 Flash memory devices and a download EPROM. These parts replace the four EPROM sockets used on the MVME167/187. The Flash parts are programmable on the MVME166 board and the programming code is provided in the download EPROM. The Flash devices provide 1 MB of ROM at address $FF800000-$FF8FFFFF. The download EPROM provides 128 KB of ROM at $FFF80000-$FFF9FFFF. The download EPROM is mapped to local bus address 0 following a local bus reset. This allows the MC68040 to access the stack pointer and execution address following a reset. The download EPROM appears at 0 until the DR0 bit is cleared in the PCCchip2 chip. The Flash devices are controlled by the VMEchip2 and the download EPROM is controlled by the PCCchip2. The PC0 bit in the MC68230 PI/T chip must be low to enable writes to Flash.

The EPROM contains the BootBug product (166BBug). Because Flash memory can be electronically erased, the EPROM firmware is a subset of the regular debugger product. It contains enough functionality from the debugger to permit downloading of object code (via VMEbus, serial port, SCSI bus, or the network) and reprogramming of the Flash memory.

A jumper on the MVME166 (J3, pins 7 and 8) controls the operation of the BootBug. If the jumper is in place, the BootBug (which always executes at power-up and reset) passes execution to the full debugger contained in Flash memory. If the jumper is removed, execution continues (with diminished functionality) in the BootBug.

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MVME166 Single Board Computer Installation Guide

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Motorola MVME166IG/D2 manual Data Bus Structure, MC68040 MPU, Flash Memory and Download Eprom
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MVME166IG/D2 specifications

The Motorola MVME166IG/D2 is a pioneering embedded computer designed for high-performance applications in industrial and telecom sectors. This versatile computing platform is based on the PowerPC architecture, which ensures efficient processing capabilities and transfer of data, making it suitable for a wide range of applications, including real-time control, data acquisition, and system monitoring.

One of the main features of the MVME166IG/D2 is its powerful processor. The system is equipped with a PowerPC 603e processor, which offers a remarkable performance rate with a clock speed of up to 250 MHz. This high-speed processing capability allows for rapid data handling and processing, which is critical for demanding applications in real-time environments.

The MVME166IG/D2 also stands out due to its modular design. It supports multiple expansion slots that make it adaptable for different user needs. The system can accommodate additional cards or memory modules, allowing for increased versatility and capability in various operational scenarios.

In terms of connectivity, this embedded computer includes multiple communication interfaces such as Ethernet and serial ports, which facilitate seamless data transfer and communication within larger systems. This connectivity is crucial for integrating the device into existing industrial networks or for connecting with sensors and other equipment.

Another noteworthy characteristic of the MVME166IG/D2 is its robust build quality, which is essential for operation in challenging environments. The device is designed to endure high levels of shock and vibration, making it suitable for deployment in applications such as transportation or heavy machinery.

Additionally, the MVME166IG/D2 offers a range of software support which includes various real-time operating systems. This compatibility allows developers to choose the OS that best fits their application's requirements, enhancing the overall utility of the system.

In summary, the Motorola MVME166IG/D2 is a powerful, flexible embedded computing solution that excels in performance, modularity, and reliability. Its advanced features and durable design make it an ideal choice for industries that require precision, speed, and robustness in their computing solutions.
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