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 on Intel 80486 PC/AT architecture with integrated cache memory. It supports two operation modes: standard PC/AT boot mode and VMEbus controller mode. The onboard dual-port shared memory enables low-latency data exchange between local CPU and remote VME bus nodes,equipped with mailbox semaphore registers for multi-board event synchronization. Standard PC/104 stacking connector allows adding extra peripheral modules without occupying additional VME slots. VME interface supports full master and slave functions,32-bit DTB data transfer with automatic byte/word swapping and complete VME interrupt handling. Front panel integrates dual RS232 serial ports,parallel printer port,PS/2 keyboard & mouse interface,SVGA monitor port and power/activity LED indicators. Power-on BIT self-test automatically verifies 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 system,aerospace ground test bench and retrofitted hardware-in-loop simulation VME chassis.

Working principle

Intel 486 CPU runs PC/AT compatible real-time operating systems and user control applications. In VME controller mode,the board acts as VME bus master to read/write all VME slave I/O modules on backplane. Dual-port memory can be accessed concurrently by local processor and remote VME master to realize transparent inter-board data sharing. PC/104 bus extends stacked peripherals on top of SBC. Mailbox registers manage multi-CPU event trigger and resource locking. BIT diagnostic executes automatically at power-up,validates memory and peripheral circuits and updates fault status registers. VME FPGA performs bus arbitration,address decoding and byte alignment for 32-bit VME data transfer. ESD protection circuits safeguard front panel I/O interfaces against transient noise.

Onboard components

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

LED indicators

Front panel LED indicators for power and hard disk activity.

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 verification;VME master/slave bus communication validation.

Programming software

VMIC SBC BSP package and driver library,supports VxWorks,Linux,QNX and classic PC/AT operating systems;software tool for VME bus resource configuration,dual-port memory mapping and 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,32 bit DTB transfer,master / slave operation,programmable address modifier,VME interrupt support Processor: Intel 80486 Expansion: PC/104 stackable peripheral connector Inter-processor: Dual-port memory,mailbox semaphore registers Front I/O: Dual RS232 serial,parallel port,PS/2 keyboard & mouse,SVGA video Control mode: VME master/slave,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 air cooling Protection: ESD protection,overvoltage clamping 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 486 single board computer with 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 required,connect keyboard,video,serial and parallel cables to front panel I/O ports.Power on chassis,load corresponding BSP and run BIT diagnostic before commissioning.

Interface

VME J1/J2 backplane connector,front-panel multi I/O connector,PC/104 expansion pins,fault status register pins.

Diagnostic

Board undetected: poor VME backplane contact,damaged edge connector or VME arbitration misconfiguration. Dual-port memory access failure: memory chip fault or bus timing mismatch. PC/104 peripheral no response: stack connector poor contact or incompatible peripheral module. BIT memory test fail: defective RAM chip or memory timing error.

Product Brief

VMIC VMIVME-7487A single height 6U VME single board computer,Intel 486 CPU with dual-port shared memory and PC/104 expansion,works as legacy VME chassis main controller for turbine control and aerospace hardware-in-loop real-time simulation systems.