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

5.4 Example Usage

The important parameters that are configured to AWR2243 devices in a two chip cascade system are tabulated here, to illustrate usage possibilities. Although only two devices are shown here, the example can be expanded to more devices (one of them being a master and others being slaves).

Table 3. Channel Configuration Message

Parameter Device 1 Device 2
Cascade Configuration MULTICHIP_MASTER MULTICHIP_SLAVE

Table 4. Profile Configuration Message

Parameter Device 1 Device 2
Profile 1 Start Frequency 77 GHz 77 GHz
Profile 1 FMCW Slope 30 MHz/µs 30 MHz/µs
Profile 1 Idle Time 10 µs 10 µs
Profile 1 Ramp End Time 30 µs 30 µs
Profile 1 Sampling Rate, no. of samples 5 MSPS, 128 5 MSPS, 128
Profile 1 TX power (backoff) 0 dB 2 dB
Profile 2 Start Frequency 78 GHz 78 GHz
Profile 2 FMCWC Slope 60 MHz/µs 60 MHz/µs
Profile 2 Idle Time 15 µs 15 µs
Profile 2 Ramp End Time 60 µs 60 µs
Profile 2 Sampling Rate, no. of samples 5 MSPS, 256 5 MSPS, 256
Profile 2 TX power (backoff) 0 dB 2 dB

Table 5. Chirp Configuration Message

Profile Index TX_ENABLE (TX1,2,3) TX (1,2,3) BPM (Degrees) Idle Time Dither
Chirp Index Device 1 Device 2 Device 1 Device 2 Device 1 Device 2 Device 1 Device 2
0 1 1 1,0,0 0,0,0 0,0,0 0,0,0 0 µs 0 µs
1 1 1 0,1,0 0,0,0 0,0,0 0,0,0 2 µs 2 µs
2 1 1 0,0,1 0,0,0 0,0,0 0,0,0 0.5 µs 0.5 µs
3 1 1 0,0,0 1,0,0 0,0,0 0,0,0 1 µs 1 µs
4 1 1 0,0,0 0,1,0 0,0,0 0,0,0 1.5 µs 1.5 µs
5 1 1 0,0,0 0,0,1 0,0,0 0,0,0 0 µs 0 µs
6 1 1 1,0,0 0,0,0 180,0,0 0,0,0 0 µs 0 µs
7 1 1 0,1,0 0,0,0 0,180,0 0,0,0 2 µs 2 µs
8 1 1 0,0,1 0,0,0 0,0,180 0,0,0 0.5 µs 0.5 µs
9 1 1 0,0,0 1,0,0 0,0,0 180,0,0 1 µs 1 µs
10 1 1 0,0,0 0,1,0 0,0,0 0,180,0 1.5 µs 1.5 µs
11 1 1 0,0,0 0,0,1 0,0,0 0,0,180 0 µs 0 µs
12 2 2 1,0,0 0,0,0 0,0,0 0,0,0 0 µs 0 µs
13 2 2 0,1,0 0,0,0 0,0,0 0,0,0 2 µs 2 µs
14 2 2 0,0,1 0,0,0 0,0,0 0,0,0 0.5 µs 0.5 µs
15 2 2 0,0,0 1,0,0 0,0,0 0,0,0 1 µs 1 µs
16 2 2 0,0,0 0,1,0 0,0,0 0,0,0 1.5 µs 1.5 µs
17 2 2 0,0,0 0,0,1 0,0,0 0,0,0 0 µs 0 µs
18 2 2 1,0,0 0,0,0 180,0,0 0,0,0 0 µs 0 µs
19 2 2 0,1,0 0,0,0 0,180,0 0,0,0 2 µs 2 µs
20 2 2 0,0,1 0,0,0 0,0,180 0,0,0 0.5 µs 0.5 µs
21 2 2 0,0,0 1,0,0 0,0,0 180,0,0 1 µs 1 µs
22 2 2 0,0,0 0,1,0 0,0,0 0,180,0 1.5 µs 1.5 µs
23 2 2 0,0,0 0,0,1 0,0,0 0,0,180 0 µs 0 µs

NOTE

The timing dither parameters are different chirp to chirp but similar for both devices.

Table 6. Frame Configuration Message

Parameter Device 1 Device 2
Start Chirp Index 0 0
End Chirp Index 23 23
Number of loops 8 8
Frame Periodicity 50 ms 50 ms
Number of Frames 100 100
Trigger Mode SWTRIG HWTRIG

The frame trigger messages are given in this order:

  1. Issue frame trigger message to device 2 (and to other slave devices if more are present)
  2. Receive acknowledgment from device 2 (and other slave devices)
  3. Issue frame trigger message to device 1 (master)

With this, the desired number of frames gets generated from all AWR2243 devices in the cascaded system in tandem.