Curtiss-Wright / VMETRO / Micro Memory MM-6326AD/32M High Speed VME / VSB Memory Module

The Curtiss-Wright MM-6326AD/32M is a high-speed dual-port memory module for VMEbus Rev C1 and VSBbus Rev C systems, delivering up to 32 MB of DRAM capacity with data transfer rates exceeding 30 MB/sec. Engineered for data acquisition, signal processing, and computing tasks, this single-slot VME module supports flexible address configurations and block transfer operations across both bus architectures.

Technical Specifications Memory capacity options include 8 MB, 16 MB, and 32 MB. The module supports VMEbus data paths of 8, 16, and 32 bits via User Address/Data (UAT), with VSBbus fixed at 32 bits. Address paths accommodate A32 and A24 on VMEbus and A32 on VSBbus. Data transfer performance leverages Bank-Interleave, Page Mode, and Block Transfer (BLT) techniques. Sequential access reaches 256 bytes per BLT on VMEbus and 64 Kbytes per BLT on VSBbus. Read cycle times achieve 125 nsec (BLT/Page Mode/Bank-Interleave) or 200 nsec (Bank-Interleave only). Write cycles reach 125 nsec (BLT/Page Mode/Bank-Interleave) or 200 nsec (Bank-Interleave). Access times are 75 nsec read and 50 nsec write with optimized modes, or 150 nsec read and 90 nsec write with Bank-Interleave. Module selection is jumper-configurable on 1 Mbyte boundaries within the 4 GB A32 address space or 16 MB A24 space. Address modifiers decode through a socketed IFL, supporting A24 codes 39, 3A, 3D, and 3E for long word, word, and byte transfers.

Key Features

Byte-wide parity generation and checking with BERR* status reporting

Control Status Register (CSR) in short I/O space for parity control and VSB cache configuration

Write-Wrong Parity mode for diagnostic testing

Operating temperature: 0 to +60°C

Operating humidity: up to 95% without condensation

Typical Applications Data acquisition systems, real-time signal processing, embedded computing platforms requiring sustained high-bandwidth memory access.

Compatibility & Integration Compatible with MVME130/131, MVME135/136, MVME141, and Delta Series systems supporting VMEbus Rev C1 and VSBbus Rev C standards.