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AIS Baseband Processor ICs (with and without RF Synthesisers)

CMX7032 and CMX7042


Features:
  • Half-duplex GMSK and FSK Modem
  • Marine AIS and DSC Data Formats
  • Supports CSTDMA Operation
  • Configurable by Function Image
  • Optimum Co-channel Performance
  • Flexible Signal Channels:
    • Two Simultaneous Rx
    • One Tx
  • Two Flexible Integer-N Synthesisers *CMX7032 only
  • Two Synthesised Auxiliary System Clocks
  • Limiter-discriminator Rx Interface
  • Flexible Tx Interface
    • I and Q
    • Two Point Modulation
  • Auxilary ADC and DAC Functions
    • Four x 10-bit DACs
    • Two x 10-bit ADCs
Applications:
  • Marine AIS Safety Systems
  • Marine AIS Rx-only Modules
  • AIDS to Navigation (AtoN)
  • Marine AIS Search and Rescue Transponder (SART)
Supply Requirement:
  • 3.3V power supply

As a CML product built on FirmASIC® technology, these highly integrated ICs can be configured, by Function Image file to one of two separate AIS functions:

  • Marine AIS Transceiver - Class B (CSTDMA/SOTDMA) and Class A

  • Marine AIS dual channel Rx-only

Marine AIS Class B Implementation - Function Image 7032/7042FI-1.x
The 7032/7042FI-1.x provides a half-duplex, marine AIS baseband signalling processor IC with two on-chip RF synthesisers additionally available on the CMX7032.

Comprising two parallel limiter-discriminator Rx paths and one I and Q or two-point modulation Tx output path, the CMX7032 and the CMX7042 fulfil the requirements of the Class A/B marine AIS system.
Each of these paths is configurable for marine AIS or DSC operation.

Marine AIS Rx-only Implementation - Function Image 7032FI-2.x
A marine AIS baseband signalling processor IC, the CMX7032FI-2.x fulfils the requirements of the Rx-only marine AIS receiver market.

The 7032FI-2.x comprises two parallel Limiter-Discriminator Rx paths and an RS232 style/NMEA 0183-HS compatible output (38400 baud). The device performs signal demodulation with associated marine AIS functions, such as training sequence detection, NRZI conversion and HDLC processing (flags, bit de-stuffing, CRC check).

Integrated Rx data buffers are also provided which removes the need for a host IC.

Provision of a number of user-programmable areas within the FI allows the RF synthesisers of the CMX7032 to be programmed directly, which simplifies the system hardware design, reducing the overall equipment cost and size.

Allowance is made in the RS232 interface for an external GPS device to be connected to reduce the proliferation of interface connections in the final product design.

Design Support Information

 

CMX7032 and CMX7042 FAQ
 

Function Image Loading Options
Q. I am about to start a design using one of your FirmASIC® based products, what is the most suitable method of storing the associated Function Image™ in my project?

A. Our FirmASIC® based devices require a Function Image to configure their On-chip sub-systems. 
This data file is uploaded during device initialisation and defines the device's function and feature set.

The Function Image can be loaded automatically from external serial memory or from a host µController over the C-BUS/SPI port. The serial memory can be programmed using a dedicated programmer.The serial memory can also be programmed using the target CMX7xxx device and the host processor. This facility makes programming the serial memory possible during factory test or through field upgrade.
    -The method for loading an FI over C-Bus/SPI is detailed in the device's data sheet.
    -The method for programming the serial memory is described in this Application Note.

For FI-2.x only. Directions for loading an FI over the RS-232 port can be found here.


For CMX7032 FI-2.x
Q. The CMX7032 FI-2.x includes a NRESET pin, I understand that this allows the device to be fully reset following a temporary loss of power (e.g. Brown Out Condition).
Is there a particular way to use this pin if I am using an external Serial memory to store the Function Image?

A. The hyperlinked pdf document [CMX7032 Power-up and Reset] provides an illustration of how the NRESET can be used during a Brown Out Condition.
It can be used at any time following an initial [power up sequence and Function Image load).
CML recommends the use of an external voltage supervisor IC if it is exposed to variable supplies such as those found in automobile applications.


For 7032FI-1.x

Q. I am about to evaluate the AIS Baseband Processor what Evaluation Kit is recommended?

A. For evaluation at baseband, either the PE0201 or PE0401 kits are the best option. These kits can be used with RF test sets or vector generators and signal analysers. The tx and rx channels require a relatively flat frequency response that extends near to dc.

For 7032FI-1.x use the PE0201 kit with the following changes:

  • C21 and C22 on the Mod1 and Mod2 paths should be removed
  • C11 at the discriminator input must be replaced by a zero ohm link
  • The removal of C17 may also benefit performance
  • All other components may remain the same

For 7042FI-1.x use a PE0402 kit where solder pads are provided to allow a solder bridge to be made in series with each input decoupling capacitor. The outputs are already dc coupled so no further changes are required. See the PE0402 User Manual and schematic.

For RF evaluation, the DE70321 provides a complete solution and is offered as a demonstration kit that can form the basis of a reference design.

  • The DE70321 for evaluation using FI-2.x as a standalone AIS receiver.
  • The DE70321 with the PE0003 for evaluation using FI-1.x in AIS receivers.
  • The DE70321T with the PE0002 for evaluation using FI-1.x in AIS transceiver designs.

Note: If evaluating the 7042FI-1.x with a PE0401 kit the same modifications should be made.


 
 
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