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Reg : GC5330 Sync signals

naresh kumar2
Prodigy 200 points
Other Parts Discussed in Thread: OMAPL138, DAC3482

HI,

  We are using GC5330 in our design (LTE-Remote radio heads for 2x2 MIMO), We have some confusion with the I/O sync signals  of GC.

1. In the datasheet regarding SYNCA signal which is used to initalize the GC needs to be active for  minimum of 4 DPD clock cycles , Does this needs to be periodic with 4 DPD clock cycles active high & low  ??

Since we have only one GC5330 chip used in the design .. do we need to program SYNCB also ?

2. We have the GC5330 configuration from TI (for 2x2 mimo,20MHZ) and is been programmed from OMAPL138  and GC is interfaced to DAC3482  in word mode . (Is the configuration provided is in word/Byte mode ?)

    when GC is configured ..there should be sync out (TXA0 ,pin C18,B19) to DAC along with the 16 data signals but in our design we could see GC giving out only 16 data and frame clock output to DAC but not  SYNC.

But in word mode Frame clock is optinal and SYNC(TXA0 of GC) is necessary ..kindly clarify ??

  • 0
    TI__Mastermind 37500 points

    Hello

    SyncA can have a minimum of 4 DPD clocks, it is used throughout the initialization of the device.  SyncA can be a pulse stretched version of the BBFrame signal, in that it comes for the first BBFrame of the 10ms radio frame.  Most customers stretch this to be at least 8 DPD clocks.  It must meet the Tsu and Thold sampled by the DPD clock.

    SyncB is for advanced APIs that require an additional synchronization point.  It is not needed for the base LTE configurations.

    The standard GC5337 application is for the DAC3482 in word mode.

    The Sync output from the DAC signals is not needed in word mode, as the DAC clock identifies the I and Q components in a cycle.

    The DAC transfer clock, and 16bit LVDS data are used, the other signals are not required.

    Regards,

    Radio Joe