VMIC VMIVME DR11W DMA Parallel Interface Board

Module Feature

VMIVME DR11W is a single-slot 6U VMEbus high-performance DMA parallel interface board developed by VMIC (GE Fanuc / Abaco Systems). It acts as the bridge between VMEbus and DEC DR11-W / DRV11-WA style external parallel devices, supporting 32-bit DMA block data transmission without continuous CPU intervention. The onboard DMA controller handles high-speed bulk data movement, with software-selectable byte/word swapping function to match different endian requirements. It integrates watchdog timers to prevent bus lockup caused by cable or external device faults. Users can configure programmable VME interrupt levels and interrupt vectors for event notification upon DMA completion. The front panel equips a fault status LED, and the board supports offline BIT self-test and single-board loopback diagnostic with dedicated test cable. VME interface fully complies with IEEE P1014 VMEbus specification, supports 16 / 32-bit transfer modes and burst pipelined addressing. Rugged Eurocard PCB with conformal coating,shock and vibration screened for power plant cabinet environment,widely used in gas/steam turbine high-speed data link communication,aerospace ground test bench and hardware-in-loop real-time simulation VME chassis.

Working principle

VME host configures DMA start address, byte count and transfer direction to the control registers of VMIVME DR11W. The onboard DMA controller initiates parallel data read/write operations via DR11W port, moving data directly between VME system memory and external DR11W compatible equipment. Watchdog circuit monitors transfer progress; timeout event triggers bus reset and fault flag. BIT loopback mode internally connects transmit and receive lines to verify parallel signal integrity without external hardware. VME FPGA completes bus arbitration, address decoding and handshake between VME backplane and DMA control logic.

Onboard components

VME interface FPGA,32-bit DMA controller,bus interrupter module,16-bit parallel transceiver array,watchdog timer circuit,byte/word swap logic,BIT loopback test hardware,VME J1/J2 edge connector,front-panel parallel I/O connector and fault LED.

LED indicators

Front panel LED indicators for module fault alarm and transfer timeout warning.

Hardware self-diagnosis

Visual inspection of PCB,components and solder joints;board ID register readback verification;BIT loopback signal test with test cable;VME A16/A24 register read/write validation.

Programming software

VMIC DR11W interface driver library and configuration utility,supports VxWorks,Linux and QNX real-time operating systems;software tool for DMA parameter setup,interrupt vector configuration and BIT fault log reading.

Electrical & Process Parameters

Model: VMIVME DR11W Brand: VMIC Device type: 6U VMEbus DR11W parallel DMA interface module Bus standard: VMEbus IEEE P1014, A16/A24 addressing, D08/D16/D32 data transfer Data channel:16-bit parallel DR11-W / DRV11-WA compatible port DMA:32 bit DMA engine,block & single-cycle transfer,burst pipelined addressing Control mode: VME master/slave dual operation,programmable interrupt,watchdog timeout protection,software byte/word swap,BIT loopback self-test Power supply: +5 V from VME backplane Cooling: Convection cooling Protection: Watchdog bus lockout protection,signal ESD 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℃ ~ +70℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:20~80% non-condensing Certification: CE compliant Status: VMIC 6U VME DR11W parallel DMA link board for high-speed block data transfer

Installation

Follow ESD safety procedure before handling.Fully power off VME chassis.Insert VMIVME DR11W into vacant 6U VME slot and lock front panel ejector latches.Set onboard jumpers for interrupt level and address modifier.Connect DR11W parallel cable to front I/O connector.Power on chassis,load VMIC DMA driver,run BIT loopback diagnostic before commissioning.

Interface

VME J1/J2 backplane connector,front-panel DR11W parallel I/O connector,DMA interrupt and fault status register pins.

Diagnostic

Board undetected: poor VME backplane contact,damaged edge connector or incorrect address modifier setting. DMA transfer stuck: watchdog timeout triggered,loose parallel cable or external device handshake fault. BIT loopback failure: parallel transceiver hardware damage or front connector pin open circuit. Interrupt missing: interrupt vector/level misconfigured or bus interrupter fault.

Product Brief

VMIC VMIVME DR11W single height 6U VME DMA parallel interface board,32-bit DMA engine and DEC DR11-W compatible 16-bit parallel port with watchdog protection and BIT loopback test,builds high-speed block data link for turbine data transmission and aerospace hardware-in-loop simulation VME systems.