SWRA574B October   2017  – February 2020 AWR1243 , AWR2243

 

  1.   AWR2243 Cascade
    1.     Trademarks
    2. 1 Cascaded AWR2243 System
    3. 2 Synchronization of AWR2243 Chips
      1. 2.1 20 GHz (FMCW) RF LO Sync
      2. 2.2 Digital Frame Sync
        1. 2.2.1 Frame (Burst) and Chirp Timing in AWR2243
        2. 2.2.2 Frame (Burst) and Chirp Timing in a Cascaded System
        3. 2.2.3 Inter Chip Imbalance of Digital Sync Timing
      3. 2.3 40 MHz (System) Reference Clock Synchronization
    4. 3 Connectivity
      1. 3.1 20 GHz LO Sync Pins Connectivity
      2. 3.2 DIG_SYNC Connectivity
      3. 3.3 40 MHz (System) Reference Clock Connectivity
    5. 4 20 GHz LO Sync Link Budget
    6. 5 Software Messaging
      1. 5.1 Configuration of Devices
      2. 5.2 Configuration of Frames
        1. 5.2.1 Similar Configuration Across AWR2243 Devices
        2. 5.2.2 Dissimilar Configuration Across AWR2243 Devices
      3. 5.3 Triggering of Frames
      4. 5.4 Example Usage
      5. 5.5 Other Usages
    7. 6 Advantages of AWR2243 Cascading System
    8. 7 References
  2.   Revision History

5.2.1 Similar Configuration Across AWR2243 Devices

All the timing and frequency parameters are expected to be configured exactly similarly to all AWR2243 devices in the cascaded chip system through the profile configuration message. The timing parameters refer to: Idle Time, Ramp End Time, RX ADC sampling rate, sampling start time and number of ADC samples per chirp. The frequency parameters refer to: Start Frequency and FMCW slope. Further, the timing parameters conveyed through the frame configuration message also need to match across the devices. These include the frame periodicity and number of frames to be generated.

Typically, the incremental dithering of the timing parameters configured through chirp configuration messages are also expected to be similar across the AWR2243 devices. Further, note that the frequency dithering parameters have no meaning in the slave devices as it is only the master which generates the LO signal based on the frequency parameters.

The similarity of timing parameters across AWR2243 devices ensures that the MULTICHIP_SLAVES get ready for each frame in time after completing fully or partially any calibration or monitoring that they may be engaged in during the inter frame times. The similarity of frequency parameters across AWR2243 devices ensures validity of calibration results during actual chirps, given that there may be RF subsystems may have RF frequency dependent performance.