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CM5

Combination Module: 2 Ch. Dual-Redundant MIL-STD-1553 & 8 Ch. ARINC 429/575 Communications Interfaces

The CM5 provides a combined function alternative which mitigates SWaP-C system integration and configuration challenges. The CM5 function essentially combines two of NAI’s popular functions on a single-slot function module:

MIL-STD-1553 Communications Interface : The CM5 smart function provides a MIL-STD-1553 interface Bus Controller (BC), Remote Terminal (RT) or Bus Monitor (BM) function (programmable per channel). The IP/Core MIL-STD-1553 firmware supports NAI software/API Assisted Mode Capability (AMC).

ARINC 429/575 Communications Interface : The CM5 smart function provides a fully programmable ARINC 429/575 communications interface. ARINC 429 (and legacy ARINC 575) is a data transfer standard for aircraft avionics. It uses a self-clocking, self-synchronizing data bus protocol. The physical connection wires are twisted pairs carrying balanced differential signaling. Data words are 32 bits in length and most messages consist of a single data word. Messages are transmitted at either 12.5 or 100 kbps to other system elements that monitor the bus messages. The transmitter constantly transmits either 32-bit data words or the NULL state. A single-wire pair is limited to one transmitter and no more than 20 receivers. The protocol allows for self-clocking at the receiver end, thus eliminating the need to transmit clocking data.

Features
  • Independent (dual-redundant) MIL-STD-1553 interface channels: Bus Controller (BC), Remote Terminal (RT), and Bus Monitor (BM) or RT/BM combined mode operation
  • Assisted Mode (AM)
  • 64KB onboard memory per channel
  • IP-core register-compatible with DDC™ family of devices
  • Ability to set message retry policy
  • Message scheduling capability
  • Asynchronous message capability
  • Message FIFO capability

Specifications
  • Number of Channels: 2 Dual-Redundant (Transformer-Coupled)
  • IP Core: IP-core compatible with DDC™ family of devices. 64KB onboard memory per channel.
  • User Interface: NAI Assisted Mode Capable (AMC) interface for rapid setup, transmission and/or reception of packets.
  • UI Onboard RAM: Three 1K words FIFOs per channel
  • Operational Modes: Programmable as Bus Controller (BC), Remote Terminal (RT), Bus Monitor (BM), or BM/RT
  • Output Signal: ~24 Vp-p, as per MIL-STD-1553
  • ARINC 429/575 Input/Output Format: Eight channels, programmed for either Rx or Tx per channel
  • ARINC 429/575 Frequency: 100 kHz or 12.5 kHz operation (programmable)
  • ARINC 429/575 Buffers: 255 message FIFO Rx or Tx FIFO buffering or scheduled transmits; SDI/Label Filtering
  • ARINC 429/575 Self-Test: Loopback test
  • ARINC 429/575 Format: AR429 or 575 programmable/channel ARINC 429 reserves bit 32 for parity, while ARINC 575 can use bit 32 for either parity (when BNR) or data (when BCD).
  • Mode of Operation: Differential
  • Data Rate (ARINC 429): 100 kHz
  • Date Rate (ARINC 575): 12.5 kHz
  • Driver Output Signal Level (Min Loaded): ±10.0 V
  • Receiver Input Voltage Range: -17 V to +17 V
  • Receiver Input Resistance (Ohms): 15 K
  • Power: 5 VDC @ 1150 mA +/-12V @ 0.15 A MIL-STD-1553, estimated at 100% duty cycle (1-channel)
  • Weight: 1.75 oz. (50 g)
Block Diagram

(Click diagram to enlarge)

Documentation
2/2/2021 3:04:42 PM
2/2/2021 3:05:22 PM
Accelerate Your Time-to-Mission™ With COSA®

NAI’s Configurable Open Systems Architecture™ (COSA®) offers a choice of over 70 smart I/O, communication, and Ethernet switch functions, providing the highest packaging density and greatest flexibility of any multifunction I/O board in the industry. Preexisting, fully-tested functions can be combined quickly and easily in an unlimited number of ways. Each I/O function has dedicated processing, unburdening the system Single Board Computer (SBC) from unnecessary data management overhead.

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