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AIF2 RM sync problem

Lin Feng1
Intellectual 625 points

hello,

        I connet the DSP1's aif2 with DSP2's aif2 interface, and data is sent from DSP1 to DSP2 by AIF2. I have seen the AIF2 datasheet, it says the DSP1 TM module will always send K28.5 in IDLE stage(CPRI mode) when TM is enabled. and DSP2 RM will receive K28.5 many times and step into ST3 finally. so, receiver AIF2 will stay in frame sync stage even though the DSP1 do not send any AxC data, just enabled the DSP1's TM?

  • 0
    TI__Expert 4740 points

    Yes. AIF2 egress generates empty frame and K28.5 continuously even though there is no traffic from PE, once the phy link is established to ST3

     

    Regards,

    Albert 

  • 0 in reply to Albert Bae
    Intellectual 625 points

    for TM(CPRI mode), what is the difference between IDLE and RE_SYNC stage? datasheet says the K characters are sent in IDLE once the TM is enabled. here "K characters" means K28.5? and whether the other control data, for example the HFN, is sent in IDLE stage.

    for RM(CPRI mode), it just check the K28.5 to determine if the next stage is entered? for example, RM is in ST1 once receive one K28.5. and it will enter ST2 if N K28.5 are received, then M k28.5 are received and RM enter into ST3. in this procedure, just K28.5 is checked? if  KFN is not existed in the line, it will enter into ST3 finally,also?