Description

System Considerations for MVME162-012

This document compiles the core system parameters and operating specifications of the MVME162-012 in terms of power connection, bus configuration, memory settings, and troubleshooting, to ensure stable operation of the device.

1. Power Supply and Bus Connection Requirements

The MVME162-012 draws power from the VMEbus backplane connectors P1 and P2. Both connectors must be connected to the main board simultaneously; otherwise, the device may not function properly.
In addition to supplying power, the P2 connector serves two other functions: transmitting the upper 16 bits of data in 32-bit transfers, and transmitting the upper 8 address lines in extended addressing mode.

2. VMEbus Configuration and Data Handling

Whether operating as a VMEbus master or slave device, the MVME162-012 is by default configured for 32-bit address (A32) and 32-bit data (D32) modes.
Rules for handling devices of different specifications:
- A16 or A24 devices: Must operate within the address ranges specified in Chapter 3. For details, refer to the memory maps in Chapter 3.
- D8 or D16 devices: Must be handled by the MC68040/MC68LC040 software. For details, refer to the memory maps in Chapter 3.

3. Onboard DRAM Settings

The MVME162-012 is equipped with shared onboard DRAM, whose base address can be selected via software.
In the initial state, programmed by the MVME162-012 Bug firmware, both the onboard processor and offboard VMEbus devices map this local DRAM to the physical base address $00000000.
Users can modify the DRAM base address to any other address through software. For detailed operations, refer to the MVME162-012 Embedded Controller Programmer’s Reference Guide.

4. Bus Timeout and System Lockup Risks

The MVME162-012 will enter an infinite wait while waiting for the VMEbus cycle to complete, causing a system lockup, when all three of the following conditions are met:
- Attempting to access offboard resources at a non-existent location;
- The device is not acting as the system controller;
- The system has no global bus timeout function.
The only scenario where the global bus timeout function may be missing: The MVME162-012 is not the system controller, and no global bus timeout is configured elsewhere in the system.

5. Multi-Device Installation Specifications

Multiple MVME162-012 units can be installed in a single VME chassis, and the device supports hardware multiprocessor features.
Special installation restriction: If multiple MVME162-012 units are installed in an MVME945 chassis, do not install an MVME162-012 in slot 12. The height of the IP modules may lead to insufficient space in this slot, resulting in clearance issues.

6. Multi-Processor Communication and Register Access

Other microprocessors (MPUs) on the VMEbus can perform four operations on the MVME162-012 processor: interrupt, disable, communicate, and retrieve operational status.
The Global Control/Status Register (GCSR) set includes 8 registers. All registers are accessible by both local processors and the VMEbus. One of these registers contains 4 bits that function as location monitors, enabling one MVME162-012 processor to broadcast signals to other MVME162-012 processors.

7. Power Supply for Key Components and Fuse Inspection

7.1 Remote LED/Switch Connector (J4)

The MVME162-012 provides +5 Vdc power to the remote LED/switch connector (J4) through a 1A fuse (F1) located near J4.
Troubleshooting: If none of the LEDs light up and the ABORT and RESET switches do not work, check if fuse F1 is blown.

7.2 Ethernet Transceiver Interface

The MVME162-012 provides +12 Vdc power to the Ethernet transceiver interface through a 1A fuse (F2) located near diode CR1.
Status indication and troubleshooting:
- The FUSE LED lights up to indicate that +12 Vdc power is supplied normally;
- If the MVME712M module is used, the yellow DS1 LED on the module lights up to indicate that the Local Area Network (LAN) power is normal, meaning fuse F2 is not blown;
- If the Ethernet transceiver fails to operate, check if fuse F2 is blown.

7.3 SCSI Terminator Power

The MVME162-012 provides power to the SCSI terminator through a 1A fuse (F1) located on the P2 Adapter Board or LCP2 Adapter Board.
Status indication and troubleshooting:
- A blown fuse will cause SCSI devices to function erratically or not at all;
- If the P2 Adapter Board is used with an MVME712M module and the SCSI bus is connected to the MVME712M, the green DS2 LED on the front panel of the MVME712M lights up to indicate that the SCSI terminator power is normal.

MVME162-012 PDF
MVME162-012

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