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Original question:

DS90UB953-Q1: DS90UB953 is there a clock mode "from CSI"?

DS90UB953-Q1: DS90UB953 is there a clock mode "from CSI"?

Lin Sen
Intellectual 260 points
Part Number: DS90UB953-Q1

Hi,

Per feedback of the original topic, 'CSI-2 async clock mode' is not supported. It really make me cofuse per table 1 and table 116 of ub954. 

1. Table1, there are 4 modes for STP, 'CSI-2 async', RAW12 LF, RAW12 HF, RAW10:

2. Table 116, 'FPD3_MODE', '00': CSI-MODE (DS90UB953 compatible), '01', '10', '11', these 3 modes are 'UB913A/933 compatible).

Could somebody please help to confirm how to connect UB953/954 in STP and which mode we should follow?

Thank you and look forward to hearing from you as soon as possible.

Rgs/Sen

  • 0
    TI__Mastermind 30515 points
    Sen,
    can you check UB953 d/s on clocking modes in page21? this is used to set the UB953 serializer's sync and async mode.
    for UB954, the table1 is used to set the CSI2/RAW12H/RAW12L/RAW10@STP or Coax, the async. or sync. back channel can be configured by above UB953.
    for you case, you just need set the Rhigh open (mode no.0).


    regards,
    Steven
  • 0 in reply to Steven(Shenzhen) Shi
    TI__Mastermind 30515 points
    Also, based on your back channel freq., you can set the reg 0x58[2:0] to select the correct bc-freq. in datasheet page92.

    Steven
  • 0 in reply to Steven(Shenzhen) Shi
    Intellectual 260 points
    Hi Steven,
    Thank you for the quick feedback. I still have some questions per your feedback.
    1. In our design, we set 953 as sync.mode, which means clock is coming from 954, is it conflict with mode0 of 954, 'CSI-2 async'?
    2. And our design is using STP cable, can it work with above setting?
    3. Besides, I believe CSI-2 signal is coming from 953 to 954, which should be defined as a 'forward channel', why it is called 'CSI-2 back channel' in 954's spec?

    Rgs/Sen
  • 0 in reply to Lin Sen
    TI__Mastermind 30515 points
    Sen,
    please follow up:
    1. set mode No.0 to select STP & async. back channel
    2. set reg. 0x58 to select the 50Mbps back channel data rate
    3. set the ub953 in sync. mode

    the CSI2 and back channel are independent, please don't mix them together though they are put together in table 1.

    best regards,
    Steven