Motorola MVME Series IPMC712/761 I/O Module

Motorola MVME Series IPMC712/761 I/O Module

Basic Information

The installation and user manual for the Motorola MVME series IPMC712/761 I/O module introduces two multifunctional I/O modules based on the PMC (PCI Mezzanine Card) specification. The core is positioned as an extension component for MVME5100, MVME5500, and MVME6100 single board computers (SBC), providing industrial grade I/O interfaces such as SCSI, serial, and parallel, suitable for industrial control, embedded computing, and other scenarios, especially supporting backward compatibility with the old MVME761/MVME712M modules.

Module core functions and model differences

（1） Core functional positioning

IPMC712 and IPMC761 are both single width standard PMC modules, with the core function of expanding the host's I/O interface capabilities to meet the connection requirements of multiple types of devices in industrial scenarios. The common functions include:

SCSI interface: Integrated LSI SYM53C895A controller, supports Ultra Wide SCSI (16 bit bus), synchronous transfer rate up to 40MB/s (16 bit mode), 20MB/s (8-bit mode), asynchronous transfer rate 5MB/s, suitable for industrial storage devices such as hard drives and optical drives;

Serial Communication: Equipped with Z85230 ESCC (Enhanced Serial Communication Controller) and PC97307 Super I/O chip, providing multi-channel serial ports, supporting asynchronous/synchronous modes, and adapting to serial devices such as modems and sensors;

Parallel port: Supports IEEE 1284 standard, 8-bit bidirectional communication, compatible with Centronics interface devices (such as industrial printers, data collectors);

PCI-ISA Bridge: The bridge between the PCI bus and ISA bus is achieved through the Winbond W83C554F chip, supporting ISA interrupt and DMA functions to ensure legacy device compatibility;

Data storage: Onboard 256 × 8 serial EEPROM (AT24C02), used to store Vital Product Data (VPD) and record module hardware configuration information.

（2） Core differences between IPMC712 and IPMC761

The two module architectures are consistent, with the main difference being the serial port configuration and physical interface design. The specific differences are as follows:

Comparison dimension IPMC712 IPMC761

Number of serial ports: 3 asynchronous ports+1 configurable (asynchronous/synchronous) port, 2 asynchronous ports+2 configurable (asynchronous/synchronous) ports

Serial clock configuration port 4 can be set with J2/J3/J5 jumper for transmitting and receiving clocks, supporting loop back (J5 jumper). Port 3/4 can only be set with J2/J3 jumper for transmitting and receiving clocks, without loop back function

Ethernet compatibility backboard Ethernet port unavailable (needs to be extended through P2 adapter) Support backboard Ethernet port routing (needs to be coordinated with MVME761 transition module)

Typical application scenarios focus on simple serial communication extensions, such as sensor data acquisition emphasizing multi serial device connections, such as industrial bus gateways and multi node communication

Hardware architecture and key components

（1） Hardware architecture diagram

The module is designed based on the architecture of "PCI bus → bridge chip → functional subsystem", and the core components include:

PCI interface layer: connected to the host PCI bus (32-bit, 33MHz) through P11-P15 connectors, supporting PCI bus arbitration and burst transmission to ensure data transmission efficiency;

Bridge layer: Winbond W83C554F (PIB, PCI-ISA bridge) implements protocol conversion between PCI and ISA bus, supports 8259 interrupt controller and ISA DMA channel;

Functional subsystem:

SCSI subsystem: LSI SYM53C895A controller+40MHz clock, supporting wide bus and high-speed transmission;

Serial subsystem: Z85230 ESCC (2-channel synchronous/asynchronous)+Z8536 CIO (supplementary modem control signal);

Parallel subsystem: PC97307 Super I/O chip, supporting IEEE 1284 mode;

Configuration and Storage: 2 user configurable switches (S1/GPIO configuration, S2/IDSEL selection), AT24C02 EEPROM (VPD storage).

（2） Key electrical parameters

Parameter category specification requirements

Supply voltage+5V (± 5%), ± 12V (± 10%); Typical power consumption:+5V/0.5A,+12V/0.2A, -12V/0.1A; Maximum power consumption:+12V/0.5A, -12V/0.3A

Working temperature 0~70 ℃ (PCB working temperature), storage temperature -40~85 ℃

Isolation and anti-interference support ESD protection (compliant with IEC 61000-4-2), surge protection (IEC 61000-4-5), PCI signal level 5V standard

Connectors P11~P15 (64 pin EIA-E700 connector), supporting PCI interface and I/O signal output

Hardware configuration and installation requirements

（1） Core configuration items

S1 switch (GPIO configuration): 1 × 4 switch, used to set SCSI speed and bus width:

S1-P1（GPIO2）：OFF=Ultra SCSI（20/40MB/s），ON=FAST SCSI（10/20MB/s）；

S1-P2 (GPO3): OFF=Wide SCSI (16 bits), ON=Narrow SCSI (8 bits);

S1-P3/P4: Not used (NC).

S2 switch (IDSEL selection): 1 × 2 switch, select the IDSEL signal connection of the PCI device according to the host model:

MVME5100/MVME5500: S2-P1=ON, S2-P2=OFF (connected to AD11);

MVME6100: S2-P1=OFF, S2-P2=ON (connected to AD16/AD21);