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AWR1243: Cascading Configuration and High-Speed Data for AWR1243

Antonio Puglielli
Expert 1025 points
Part Number: AWR1243

Hello,

I am using a custom two-chip AWR1243 cascade board. I have ES2.0 AWR1243 devices running DFP 1.0.

When attempting to enable the cascade operation of the devices, I see that the CSI2 clock starts up, but no data is sent over the CSI2 interface.

This behavior seems to be only affected by the cascading_cfg field of AWR_CHAN_CONF_SET_SB. Keeping all other configuration the same,
- If I set that field to 0x0001 (cascade master), I get no data over the high-speed interface.
- If I set that field to 0x0000 (single chip), then everything else operates as expected.

What sort of issue could cause this behavior? Could it be an LO generation/distribution problem? On our board, the master connects FMCW_SYNCOUT to the slave's FMCW_SYNCIN2, and master's FMCW_CLKOUT to its own FMCW_SYNCIN2.

Thanks for your help.

Best,
Antonio

  • 0
    TI__Guru*** 148974 points
    Hi

    We will get back to you early next week.


    Thank you
    Cesar
  • 0 in reply to Cesar
    TI__Mastermind 18500 points
    Hi Antonio,

    Looking through the release notes included with the DFP packages, I do not believe the DFP 1.0 package supports cascade operation. Release notes first indicate cascade support in DFP 1.1. Can you look at this issue with the latest released DFP 1.2 package here: www.ti.com/.../mmwave-dfp

    Thank you,
    -Randy
  • 0 in reply to Randy Rosales
    Expert 1025 points
    Hi Randy,

    DFP 1.2 is for ES3.0 silicon, correct? If I have ES 2.0 silicon on my board then I am inferring that this chip version does NOT support cascading? It also seems like DFP 1.1 has disappeared from the TI website. And if I am using ES3.0 version, then I suppose it must be the P variant.

    I am confused because it seems that other posts on E2E imply that ES2.0 silicon should be able to support cascade mode. Anyhow, based on your answer this is my current understanding:
    - ES2.0: does not support cascade
    - AWR1243 ES3.0: production release, does not support cascade
    - AWR1243P ES3.0: still pre-production, only device version which can use cascade.

    Can you confirm that this is correct?

    Best,
    Antonio
  • 0 in reply to Antonio Puglielli
    Expert 1025 points
    As discussed offline, it's only worth using cascade functionality with AWR1243P ES3.0 chip, and DFP 1.2.