Products / NTDS/ATDS


VMEBUS systems

The most efficient multi-channel solution for NTDS applications available today

The NTDS VME PAK brings the power and performance of IXI Technology’s state-ofthe- art PCI Mezzanine Card (PMC) technology to VMEbus systems. The NTDS VME PAK allows two independent MIL-STD-1397C NTDS channels to reside in the space of a single 6U VME slot. It can be configured with any combination of parallel or serial NTDS types A, B, C, D, E or H. With the ability to address up to 16 NTDS ABCH VMEs on the same VMEbus, as many as 32 NTDS I/O channels can be addressed while occupying half the space required for single board NTDS channels. Whether designing a new system or looking for ways to upgrade an existing system, NTDS VME PAK is the right solution for reducing space requirements while maintaining or increasing the number of NTDS channels, especially where numerous channels are needed. The NTDS VME PAK is easy to program and offers a variety of input and output modes to support any NTDS protocol. The included software device driver and application programming interface (API) library ensure smooth integration of your application with the NTDS ABCH VME’s PMC channels in VMEbus address space. Hardware-independent input and output channels allow the NTDS VME PAK to perform simultaneous input and output (full duplex) operations. On parallel channels, the NTDS type is software-selectable allowing quick reconfiguration without the use of hardware jumpers or switch settings. The NTDS VME PAK can be used for passive tap applications as well as normal NTDS I/O. An on-board time stamp generator tags individual input words with 125 ns resolution. Time stamping is software-selectable and can be used with active or passive communications. For maintenance and reliability, NTDS VME PAK parallel channels use short-circuit protected outputs to prevent failures due to improper cabling or NTDS type mismatch. An internal loopback path allows the NTDS VME PAK to be tested without disconnecting cables. The NTDS VME PAK can be updated in the field by reconfiguring its Field Programmable Gate Array (FPGA) logic to add features or compensate for non-compliant interfaces. Using FPGA technology reduces component obsolescence, enabling the NTDS VME PAK to be deployed and supported for years to come.

Product Overview

• Single or dual NTDS I/O channels
• Interrupt, PIO & DMA operation
• Independent, full duplex NTDS input and output channels
• VME A32/A24/A16 master and slave addressing
• Field Programmable Gate Array (FPGA) technology
• Separate word counters and time-outs for EI, EF, ID
and OD
• PCI master and slave operation
• Internal loopback test without disconnecting NTDS cables
• Software enabled time stamp on input words with 125ns
• Time stamps can be synchronized across multiple
• Supports receipt of multiple forced EFs

NTDS Parallel Type A/B/C/H

• 8-, 16- or 32-bit NTDS transfers
• Software-selectable NTDS type
• Short circuit protected, tri-state NTDS drivers

General Product Features

Input Mode Features

• Separate or combined data and command word buffers
• Input command words, stop on data word
• Input data words, stop on command word
• Passive tap mode
• Single word or burst mode (Type E)

Output Mode Features

• Concurrent data and command buffer operation
• Single word or burst mode (Type E)

Time-out Mode Features

• Time-out values in 10μs or 1ms increments
• Time-out between words and/or total transfer times
• Start time-out at beginning of operation or upon transfer of the first word

Software Drivers Available*

• Choice of driver included with board purchase: VxWorks®, LynxOS®
*Contact factory for new OS support

Options and Accessories

• Adapter Modules
• Cable Assemblies
• Tap Accessories

VME General Technical Specs

VMEbus interface

VME Revision C.1 (IEEE P1014)

Form factor

6U VME Eurocard


Dual Channel: 15.2 oz.

Power consumption

Configuration dependent – contact factory

Relative humidity

0% to 90% (non-condensing)

Operating temperature

0°C to +55°C

NTDS Parallel Technical Specs

NTDS interface

MIL-STD-1397C type A, B, C & H

Input buffer

64K x 32-bit FIFO

NTDS I/O connector

120 pin docking connector (Molex 52755-1200)

Power consumption

Average +5V Current Draw: .85A
Average +VI/O Current Draw: 5mA
Average Power Dissipated: 4.25W

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