• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 32 subscribers
  • Views 152 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

TSER953: CSI-2 Errors

TSER953: CSI-2 Errors (0x5E, 0x5F)

Luis Villaran
Prodigy 80 points
Part Number: TSER953
Other Parts Discussed in Thread: TDES954

We have a TSER953/TDES954 link and some times we are able to get some number of frames over the link.  However, more often than not, on initialization we are getting the following CSI errors.

FPD 953 Reg 0x5C - CSI Err Count : 02
FPD 953 Reg 0x5D - CHKSUM / ECC Err : 00
FPD 953 Reg 0x5E - LANE01 Err : 46
FPD 953 Reg 0x5F - LANE23 Err: 64

Several questions:
1. Those errors correspond to "Multi-bit error in SYNC sequence - Uncorrectable" and "Control Error in HS Request Mode". What do those mean? Can we do anything about them?
2. Those errors are making it so the LOCK/PASS link gets dropped and then no further frames can be obtained.  Is there a way to make it so that errors don't cause a drop in the link?

Thanks,
luis
  • 0
    TI__Guru* 83860 points

    Hello Luis,

    1) these errors may indicate signal integrity issue on your board/layout between SER and Image sensor. 

    2) This depends on why no more frames can be obtained? may be your SoC stops processing after a certain number of errors!

    Also, you need to check the 954 reg 0x7C[5:3] and set those bits to not truncate frames in case of errors.

  • 0 in reply to Hamzeh Jaradat
    Prodigy 80 points

    Hi Hamzeh,

    The SER deasserts its GPIOs whenever the LOCK/PASS drops, and because GPIO0 is controlling the SHUTDOWN pin of our imager this results in a reset of the imager and frames stopping. So our follow-up questions are:

    1.  Is it expected behavior that CSI errors should cause the LOCK/PASS to drop out?  If so, is there a way to bypass this behavior?

    2.  We are familiar with the SOT errors but what does  "Control Error in HS Request Mode" mean?

    And thanks for the 0x7C note -- we already had those bits cleared (so as to not truncate).

    luis

  • 0 in reply to Luis Villaran
    TI__Guru* 83860 points

    Hello Luis,

    1) No, CSI errors do not lead to LOCK/PASS drop. These will drop only if your FPD-Link Signal /Link quality is poor, or your CSI CLK/ REFCLK coming into the SER is jittery.

    2) All these CSI specific errors are either generated du to corrupted CSI signal coming from the Image sensor, or du to SI issue due to, e.g. bad layout between SER and image sensor.