AWR1642: I have some questions for ADC CQ data.(16-bit, 12-bit and 14-bit mode)

Hello JuiYang,

Firstly, there is an independent control to define the data bit width of the CQ data that is stored in the CQ memory.
The fields is CQDATAWIDTH in CQCFG1 register.
This can be configured to store 12bit/14bit/16bit information.

As you rightly noted, as CQ data is inherently 16 bit information, it is recommended to store the CQ data as 16 bit using the above field (even if ADC data is 12bit). This is in case of consumption/processing within the device/DSP.

Now, if the CQ data has to be sent out over the high speed interface (LVDS) and the bit width of ADC data and CQ data has to be the same, then you would need to configure CQDATAWIDTH to be same as ADC data width.
In this case, the HW takes care of storing the 16 bit CQ information in 12 bit sample values in CQ memory.
3 16bit CQ data will get stored as 4 12bit samples in CQ memory. Further, each 12bit sample in CQ memory would be contained in a 16bit store like the ADC data.

You may refer to the AWR1xx_Radar_Interface_Control document in the DFP package (www.ti.com/.../MMWAVE-DFP) for further details on the CQ data, storage in memory and related APIs.

Best regards,
Naveen

Hello Naveen,
Thank for you answer!

I go to see www.ti.com/tool/mmwave-dfp. I don't find “AWR1XXX Radar Interface Control Document.pdf”. I see other pdf that say (For details on these APIs and the parameters, see the “AWR1XXX Radar Interface Control Document”)

These five PDFs, which one is what I need?
1.Introduction to the DSP Subsystem in the IWR16xx
2.System Performance Measurement With the mmWave Sensor
3.Introduction to the DSP Subsystem in the AWR16xx
4.AWR1642 Bootloader Flow
5.Programming Chirp Parameters in TI Radar Devices

Cheers,
JuiYang