VMIC VMIVME-7487A Single Board Computer

Module Feature

VMIVME-7487A is a single-slot 6U VMEbus single board computer developed by VMIC (GE Fanuc / Abaco Systems),built around Intel 80486 processor with integrated cache memory. It supports two independent operating modes: standard PC/AT boot mode and VMEbus system controller mode. Onboard dual-port DRAM enables low-latency data exchange between local CPU and remote VME bus nodes,accompanied by mailbox semaphore registers for multi-board event synchronization and inter-processor alarm notification. Standard PC/104 stacking connector allows mounting additional peripheral modules without occupying extra VME slots. VME interface supports full VME master and slave functions,32-bit MBLT 64-bit block transfer,programmable address modifier and complete VME interrupt handler. Front panel integrates dual RS232 serial ports,parallel printer port,PS/2 keyboard & mouse interface,SVGA video output,hard disk activity LED and power/fault status indicators. Power-on BIT self-test automatically validates RAM,register bank and peripheral interfaces and reports hardware faults via status registers. Rugged Eurocard PCB with conformal coating,shock and vibration screened for power plant cabinet environment,widely used in gas/steam turbine legacy VME control cabinet,aerospace ground test bench and retrofitted hardware-in-loop real-time simulation VME chassis.

Working principle

Intel 80486 CPU executes PC/AT compatible real-time operating systems and user control application programs. When running as VME system controller,the board acts as VME bus master to read and write all VME slave I/O modules on the backplane. Dual-port memory can be accessed concurrently by local processor and remote VME master to realize transparent cross-board data sharing. PC/104 bus provides stacked peripheral expansion on top of SBC hardware. Mailbox registers transmit event trigger signals for multi-CPU synchronization. BIT diagnostic runs automatically upon power-up,verifies memory and peripheral circuits and updates fault status registers. VME FPGA handles bus arbitration,address decoding and byte alignment for high-speed VME data transfer. ESD protection circuits shield front panel I/O ports against transient field noise.

Onboard components

VME interface FPGA,Intel 80486 processor with cache,dual-port DRAM memory bank,mailbox semaphore register array,PC/104 expansion header,serial & parallel I/O controller,SVGA video circuit,BIT power-on self-test logic,VME J1/J2 edge connector,front-panel multi I/O connector,activity and fault LED array.

LED indicators

Front panel LED indicators for power status,hard disk activity and module fault alarm.

Hardware self-diagnosis

Visual inspection of PCB,components and solder joints;board ID register readback verification;RAM full read/write test;dual-port memory concurrent access validation;VME A24/A32 register read/write communication test.

Programming software

VMIC SBC BSP package and configuration utility,supports VxWorks,Linux,QNX and classic PC/AT operating systems;software tool for VME bus resource allocation,dual-port memory mapping,interrupt vector setup and BIT fault log reading.

Electrical & Process Parameters

Model: VMIVME-7487A Brand: VMIC Device type: 6U VMEbus 486 PC/AT single board computer module Bus standard: VMEbus, A24/A32 addressing, D08/D16/D32, MBLT 64-bit block transfer Processor: Intel 80486 with cache Expansion: PC/104 stackable peripheral connector Inter-processor: Dual-port DRAM,mailbox semaphore registers Front I/O: Dual RS232 serial,parallel port,PS/2 keyboard & mouse,SVGA video Control mode: VME master/slave dual operation,VME system controller,dual-port shared memory,PC/104 expansion,BIT power-on self-test,ESD protection Power supply: +5 V, +12 V, -12 V from VME backplane Cooling: Forced convection cooling Protection: ESD clamping on I/O ports,overvoltage power rail monitoring Mounting: Standard single-height 6U VME front panel ejector locking Protection class: PCB with optional conformal coating

Mechanical & Structure

Mounting: Single-slot 6U VME Eurocard Protection class: PCB with optional conformal coating

Environmental

Operating temperature:0℃ ~ +60℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:20~80% non-condensing Certification: CE compliant Status: VMIC 6U VME single board computer with 486 CPU,dual-port memory and PC/104 expansion

Installation

Follow ESD safety procedure before handling.Fully power off VME chassis.Insert VMIVME-7487A into vacant 6U VME slot and lock front panel ejector latches.Stack PC/104 peripherals if needed,connect keyboard,video,serial and parallel cables to front panel I/O ports.Power on chassis,load VMIC BSP firmware,run BIT power-on diagnostic before commissioning.

Interface

VME J1/J2 backplane connector,front-panel SVGA,dual RS232,parallel,PS/2 keyboard/mouse connector,interrupt and fault status register pins.

Diagnostic

Board undetected: poor VME backplane contact,damaged edge connector or incorrect address modifier setting. Dual-port memory access failure: memory chip degradation or VME bus timing mismatch. PC/104 peripheral no response: stack connector pin poor contact or incompatible hardware module. BIT self-test failure: onboard reference circuit abnormality or CPU cache fault.

Product Brief

VMIC VMIVME-7487A single height 6U VME single board computer,equipped with Intel 80486 CPU,onboard dual-port inter-processor memory and PC/104 expansion,supports VME master/slave dual operation and BIT power-on self-test,works as core controller for turbine control and aerospace hardware-in-loop simulation VME systems.