XYCOM XVME-100 memory module

XYCOM XVME-100 memory module

Core positioning and product architecture

1. Product positioning and core values

XYCOM XVME-100 is a 3U single high memory expansion module designed for industrial control systems with VMEbus architecture. Its core positioning is "a highly compatible, configurable, and reliable multi type storage expansion solution". Its core values revolve around the stringent demands of industrial scenarios:

Compatibility: Fully compliant with the VMEbus C1 standard, it can seamlessly integrate into various VMEbus systems and adapt to industrial and military embedded devices;

Flexibility: Supports four storage types: RAM, EPROM, mask ROM, and EEPROM, with independent configuration of dual storage groups, compatible with various capacity chips ranging from 8K × 8 to 128K × 8;

Reliability: Built in battery backup (typical lifespan of 6 years) and undervoltage protection circuit ensure that data is not lost in case of power failure;

Usability: Visual configuration of address, speed, backup power, and other parameters is achieved through jumper cables, supporting hot swappable installation and on-site maintenance.

2. System integration architecture

XVME-100, as the "storage expansion unit" of the VMEbus system, adopts a "modular+bus compatible" architecture. The core consists of four layers: storage core layer, configuration control layer, bus interface layer, and protection mechanism layer

Storage core layer: dual storage group (Bank1/Bank2) design, each group containing 4 32 pin JEDEC slots, supporting mixed storage chip of different types/specifications;

Configuration control layer: Address allocation, chip speed matching, backup power selection and other functions are implemented through 52 jumpers, without the need for additional software configuration;

Bus interface layer: P1 connector (3 rows of pins) compatible with VMEbus address, data, and control signals, supporting A24 address space and DTB slave device roles;

Protection mechanism layer: integrates undervoltage protection (triggered by 4.75V), data write protection, SYSRESET * driver and other functions, combined with backup power supply to form multiple data security guarantees.

Detailed explanation of key specification parameters

1. Core performance parameters

(1) Storage and Configuration Parameter Table

Specific specifications and design value of the project

Maximum storage capacity RAM/EPROM/mask ROM: 1MB;

EEPROM: 256KB covers all scenario storage requirements from small and medium-sized control programs to large data caches

Design 2 storage groups (Bank1/Bank2), each consisting of 4 32 pin JEDEC slots that support mixing of different types/speeds/capacities of chips to enhance configuration flexibility

Compatible chip specifications and capacities: 8K × 8, 16K × 8, 32K × 8, 64K × 8, 128K × 8;

Speed: 100ns, 150ns, 200ns, 250ns Compatible with mainstream industrial grade storage chips, chip speed can be selected according to real-time requirements

Storage types support RAM, EPROM, mask ROM, EEPROM (with support for fast write/polling technology), compatible with program storage (EPROM/ROM), data cache (RAM), power down save (EEPROM), and other different scenarios

The base address for address space configuration can be set through jumper wires. The storage group occupies space equal to the chip capacity multiplied by 4, and needs to be aligned to 4 times the capacity boundary to avoid address conflicts and adapt to complex systems where multiple modules work together

(2) Power and reliability parameter table

Specific specifications and design value of the project

Working power supply+5V DC, typical current 900mA, maximum 1A compatible with industrial standards+5V power supply, low-power design suitable for embedded systems

Backup power board battery (1.4Ah, typical lifespan of 6 years) or VMEbus+5V STDBY signal dual backup solution, suitable for independent devices without continuous backup power and integrated scenarios with system backup power

Under voltage protection threshold+5V ± 5% (triggered by 4.75V) to prevent voltage fluctuations from causing data writing errors or chip damage

Battery life calculation formula: Battery life (hours)=1400000/[(n × IsB)+10], where n is the number of RAM chips and IsB is the data holding current (μ A) of a single chip. The backup time can be accurately estimated based on the characteristics of the selected RAM chip, and maintenance cycles can be planned in advance

2. Physical and environmental parameters

(1) Physical specification details

Specific specifications of the project are adapted to different scenarios

The external dimensions are 3U Form Factor (single height), which conforms to the VMEbus standard size and adapts to the standard VMEbus rack. A single module occupies 1 3U slot and supports dense deployment

Connector type P1 connector (3 rows of pins, total 96 pins) compatible with VMEbus backplane signal definition, ensuring stable bus communication

Weight not clearly indicated, industrial grade modular design, lighter than 500g for rack installation and maintenance, reducing rack load pressure

Optional accessory XVME-945 6U front-end panel kit is suitable for 6U rack installation requirements, improving module fixation reliability