Product Short Description
Basic Product Identification
- Manufacturer: Motorola Embedded Computing Division (now part of Emerson Embedded Systems)
- Full Model Code: IPMC761
- Product Category: PMC Single-Width Multifunction I/O Mezzanine Card
- Product Series: MVME VMEbus Single Board Computer Auxiliary I/O Module Series
Description
Product Overview
This standard PMC (PCI Mezzanine Card) form factor expansion I/O board is designed to match Motorola MVME series VME single-board industrial computers, integrating multi-channel serial communication, parallel printing interface, Ultra-Wide SCSI storage bus and PCI-ISA bridge logic, expanding rich peripheral signal interfaces for VMEbus embedded control systems, widely used in military, aerospace and industrial real-time control equipment requiring multi-device peripheral connection.
Technical Core Specifications
- Bus Standard Compliance
- Mechanical form: Single-width standard length PMC card (IEEE P1386.1 PMC specification)
- Host bus interface: 32-bit PCI bus via PMC P11–P15 connector, compatible with MVME5100/MVME5500/MVME6100 host SBC
- On-board Peripheral Interfaces
- Synchronous/Asynchronous Serial Ports: 2 channels Z85230 ESCC (max synchronous baud rate 2.5 Mbps); 2 channels 16C550 UART asynchronous serial ports (max 38.4 kbps)
- Parallel Port: IEEE 1284 bidirectional parallel printer interface
- Storage Bus: LSI SYM53C895A Ultra-Wide SCSI controller with 40 MHz clock
- Bridge Chip: Winbond W83C554F PCI-to-ISA protocol conversion bridge
- Power Consumption Parameters
- +5 V supply: Typical 0.5 A, maximum 0.8 A
- +12 V supply: Typical 0.2 A, maximum 0.5 A
- −12 V supply: Typical 0.1 A, maximum 0.3 A
- Memory & Configuration Storage
- AT24C02 EEPROM for VPD product configuration data storage
- Two DIP toggle switches for GPIO function and PCI IDSEL address configuration
- Environmental & Mechanical
- Operating temperature: 0 °C ~ +70 °C (industrial grade; −40 °C ~ +85 °C extended military option)
- Certification: CE, UL 508, IEC 61010-1
- Dimensions: Standard single-width PMC card size 100 mm × 160 mm
- Net weight: 0.15 kg
Functional Features
- Integrated independent PCI-ISA bridge chip to expand legacy ISA peripheral devices without occupying host CPU bus resources
- Four-channel multi-mode serial port supports RS-232/RS-422/RS-485 hardware jumper switching for industrial field bus connection
- Ultra-wide SCSI interface supports connection of industrial hard disk array and tape storage for real-time control data recording
- On-board independent interrupt controller and DMA channel, realizing hardware fast data transmission without CPU intervention
- Complete front panel LED status indicators: SCSI BUSY, Parallel BUSY power and fault status
- Compatible with real-time operating systems VxWorks, pSOS, QNX for embedded industrial control
Working Principle
The IPMC761 card is mechanically fixed on the PMC expansion slot of MVME VME single-board computer, exchanging 32-bit PCI bus data with host CPU via PMC gold finger connector. Internal PCI-ISA bridge chip converts PCI bus protocol to ISA bus logic, driving multi-channel serial, parallel and SCSI peripheral controllers; external field equipment connects to front panel serial/SCSI terminals, all peripheral data buffered by on-board hardware DMA controller and transmitted to host CPU memory in real time for control logic calculation.
Material & Structural Composition
- PCB: High-temperature FR4 multi-layer circuit board with gold-plated PMC contact fingers for long-term vibration resistance
- Mechanical frame: Aluminum alloy thin protective frame with anti-vibration fixing screw holes
- Interface connectors: Industrial grade D-SUB serial ports, SCSI high-density connector, parallel port DB25 terminal
- Core chips: PCI bridge IC, SCSI controller, multi-channel UART serial communication IC, EEPROM memory chip
Advantage Highlights
- Standard PMC universal mechanical size compatible with all Motorola MVME VME single-board computers, high system scalability
- All-in-one multi-peripheral integration reduces the number of independent expansion cards inside VME rack
- Hardware DMA independent data transmission greatly reduces host CPU load for high real-time control tasks
- Industrial wide temperature design withstands continuous vibration and temperature fluctuation of vehicle-mounted, ship-borne control equipment
- Support mainstream real-time embedded operating systems without additional driver development customization
Applicable Industries
Aerospace ground test equipment, ship power embedded control, railway locomotive monitoring system, military vehicle vehicle-mounted control cabinet, industrial robot motion control test bench, power grid substation real-time data acquisition equipment
Installation Mandatory Requirements
- Align PMC card gold finger with host SBC PMC slot evenly, tighten two side fixing screws to prevent vibration loose contact
- Serial communication cable must use shielded twisted pair cable, SCSI cable use impedance-matched industrial storage cable
- VME rack must install forced air cooling fan above PMC card slots to maintain ambient temperature below 70 °C
- Separate high-voltage power wiring and low-speed serial signal wiring inside rack cabinet
Operation & Maintenance Precautions
- Power off host SBC before plugging/unplugging IPMC761 card to avoid PCI bus chip burnout
- Calibrate serial port communication baud rate matching with field equipment before system formal operation
- Clean front panel interface connectors with compressed dry air every 12 months to eliminate contact resistance from dust accumulation
- When SCSI BUSY LED keeps steady bright, shut down system to inspect storage device cable connection
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