Curtiss-Wright / VMETRO / Micro Memory MM-6326/64M High Speed VME / VSB Memory Module

The MM-6326/64M is a high-speed, dual-port VME/VSB memory module delivering 64MB of DRAM capacity for demanding real-time computing, data acquisition, and signal processing applications. Engineered for military, aerospace, and industrial systems, this single-slot VMEbus card supports multiple address and data path widths across VMEbus Revision C1 and VSBbus Revision C architectures. Block Transfer modes, bank interleaving, and page mode operation enable sustained data rates exceeding 30 MB/s with read access times of 75ns and write access times as low as 50ns in optimized modes.

Technical Specifications Memory & Architecture

Capacity: 64MB DRAM

VMEbus: A32/A24/A16 address; D32/D16/D08 data (UAT support)

VSBbus: A32 address; D32 data

Block Transfer: 256 bytes (VMEbus), 64KB (VSBbus)

Page Mode and Bank Interleave support Performance

Read Cycle/Access Time: 125ns / 75ns

Write Cycle/Access Time: 125ns / 50ns (BLT/Page Mode/Bank Interleave)

Data Rate: >30 MB/s Error Detection & Control

Byte-wide parity generation and checking

VMEbus Control Status Register (CSR) for parity reporting and error control

Write-Wrong parity mode for diagnostics

BERR* signal transmission on parity error detection Module Configuration

Jumper-selectable address assignment on 1MB boundaries

Independent memory banks for VME and VSB ports

CSR located in short I/O address space

VSB CACHEability control via CSR Environmental

Operating Temperature: 0 to +60°C

Relative Humidity: Up to 95% (non-condensing) Qualification

Burn-in and 48-hour diagnostics with temperature cycling (0–60°C)

Key Features

Dual independent bus ports eliminate contention between VME and VSB masters

Multiple address/data path widths support legacy and contemporary system architectures

Bank interleaving and page mode reduce access latency for sequential operations

Byte-level parity with CSR-accessible error tracking and write-wrong diagnostics

Jumper flexibility allows deployment across address ranges without board rework

Typical Applications Real-time signal processing, high-speed data acquisition, embedded military avionics systems, and industrial control platforms requiring low-latency memory with integrated error detection.

Compatibility & Integration Fully compatible with VMEbus Revision C1 and VSBbus Revision C systems including MVME130/131, MVME135/136, MVME141, and Delta Series platforms.