• State TI Thinks Resolved
  • Locked Locked
  • Replies 6 replies
  • Answers 3 answers
  • Subscribers 33 subscribers
  • Views 429 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

DS90UB914A-Q1: DS90UB914A output frame-rate (V_Sync) abnormaly (working with DS90UB913)

Tommy Pang
Prodigy 60 points
Part Number: DS90UB914A-Q1

Hello, 

We are using the DS90UB914A with DS90UB913A which initiating the CMOS sensor by sending I2C commands from 914A to 913A and the CMOS sensor. Now we have encountered some problem as described as follows:

- Sensor init code (I2C command) couldn't be sent from 914A to 913A thru the LVDS cable. As a result that the CMOS sensor couldn't be initiated.

- We tried other method to initiate the CMOS directly from it's I2C port (no going thru from the UB914A--UB913A path), the CMOS was initiated successfully, also the image data (RAW12) send from CMOS sensor to 913 and 914 (thru LVDS cable). The framerate (V_sync) from sensor is ok and stable, but problem is that the framerate (V_sync) from the UB914A output pin we captured was unstable.

Is there any specific setting for the UB914A & UB913A?

We have the init codes for 914A and 913A as follows:

UB914A

w 03 f9 // VDDIO as 3.3v
w 07 b6 // ser ID as 5B
others are default
UB913A
w 01 30 // VDDIO as 3.3v
w 0D 99 // enable power to sensor
w 0e 31 // 
others are default

Thanks

Tommy

 

  • 0
    Prodigy 60 points

    Here are the CLK, H_Sync, V_sync characteristic FYI

  • 0 in reply to Tommy Pang
    TI__Mastermind 30515 points

    Tomy,

    it sounds the back channel has bit error, pls check reg. 0x0a, 0x0b in UB933 side for some times, if it has CRC error, it means the link between 933 and 934 is NOT good, which made the back channel transmission error.

    For this issue, please try to check whether the PoC design has issue? cable  is not good? etc.

    best regards,

    Steven

  • 0 in reply to Steven(Shenzhen) Shi
    Prodigy 60 points

    Hi Steven

    Thanks for the reply.

    The UB913 part is from the finished product (vehicle rearview camera), we made our UB914 board for the decoding purpose. 

    We have tested the LVDS cable and it was working fine. Btw, what is PoC design?

    Best Regards

    Tommy

  • 0 in reply to Tommy Pang
    TI__Mastermind 30515 points

    HI, Tommy

    It is on high speed serial link design, if the channel or receiver/transmitter has issue, the link would become weak and have bit error. so pls check the link error firstly to dig out the root cause. regarding the POC, it is added into the high speed link, please check below app. note on power over cable design and its request. You also can refer to UB934 d/s on this.

    http://www.ti.com/lit/an/snla224/snla224.pdf

    best regards,

    Steven

  • 0 in reply to Steven(Shenzhen) Shi
    Prodigy 60 points

    Hi Steven

    Thanks for your information! We have checked all the register values in UB914A and didn't find any error. Here is the UB914 register value (0x00 ~ 0xFF) FYI

    Best Regards

    Tommy

    Register Address Register value
    0x00 C0
    0x01 4
    0x02 0
    0x03 F9
    0x04 0
    0x05 0
    0x06 B4
    0x07 B6
    0x08 20
    0x09 0
    0x0A 0
    0x0B 0
    0x0C 0
    0x0D 0
    0x0E 0
    0x0F 0
    0x10 22
    0x11 0
    0x12 0
    0x13 0
    0x14 0
    0x15 0
    0x16 0
    0x17 0
    0x18 0
    0x19 1
    0x1A 0
    0x1B 0
    0x1C 3
    0x1D 33
    0x1E 33
    0x1F 8
    0x20 FE
    0x21 17
    0x22 0
    0x23 0
    0x24 8
    0x25 0
    0x26 0
    0x27 0
    0x28 0
    0x29 20
    0x2A 0
    0x2B 0
    0x2C 0
    0x2D 8
    0x2E 0
    0x2F 0
    0x30 0
    0x31 0
    0x32 0
    0x33 25
    0x34 FA
    0x35 0
    0x36 0
    0x37 0
    0x38 0
    0x39 0
    0x3A 18
    0x3B 60
    0x3C 0
    0x3D 0
    0x3E 0
    0x3F 10
    0x40 82
    0x41 82
    0x42 0
    0x43 35
    0x44 0
    0x45 0
    0x46 0
    0x47 0
    0x48 0
    0x49 8
    0x4A 0
    0x4B 0
    0x4C 0
    0x4D 20
    0x4E 0
    0x4F 0
    0x50 FE
    0x51 80
    0x52 FC
    0x53 0
    0x54 0
    0x55 0
    0x56 0
    0x57 0
    0x58 0
    0x59 0
    0x5A 0
    0x5B 0
    0x5C 0
    0x5D 0
    0x5E 0
    0x5F 0
    0x60 0
    0x61 0
    0x62 0
    0x63 0
    0x64 0
    0x65 0
    0x66 0
    0x67 0
    0x68 0
    0x69 0
    0x6A 0
    0x6B 0
    0x6C 0
    0x6D 0
    0x6E 0
    0x6F 0
    0x70 0
    0x71 0
    0x72 0
    0x73 0
    0x74 0
    0x75 0
    0x76 0
    0x77 0
    0x78 0
    0x79 0
    0x7A 0
    0x7B 0
    0x7C 0
    0x7D 0
    0x7E 0
    0x7F 0
    0x80 0
    0x81 0
    0x82 0
    0x83 0
    0x84 0
    0x85 0
    0x86 0
    0x87 0
    0x88 0
    0x89 0
    0x8A 0
    0x8B 0
    0x8C 0
    0x8D 0
    0x8E 0
    0x8F 0
    0x90 0
    0x91 0
    0x92 0
    0x93 0
    0x94 0
    0x95 0
    0x96 0
    0x97 0
    0x98 0
    0x99 0
    0x9A 0
    0x9B 0
    0x9C 0
    0x9D 0
    0x9E 0
    0x9F 0
    0xA0 0
    0xA1 0
    0xA2 0
    0xA3 0
    0xA4 0
    0xA5 0
    0xA6 0
    0xA7 0
    0xA8 0
    0xA9 0
    0xAA 0
    0xAB 0
    0xAC 0
    0xAD 0
    0xAE 0
    0xAF 0
    0xB0 0
    0xB1 0
    0xB2 0
    0xB3 0
    0xB4 0
    0xB5 0
    0xB6 0
    0xB7 0
    0xB8 0
    0xB9 0
    0xBA 0
    0xBB 0
    0xBC 0
    0xBD 0
    0xBE 0
    0xBF 0
    0xC0 0
    0xC1 0
    0xC2 0
    0xC3 0
    0xC4 0
    0xC5 0
    0xC6 0
    0xC7 0
    0xC8 0
    0xC9 0
    0xCA 0
    0xCB 0
    0xCC 0
    0xCD 0
    0xCE 0
    0xCF 0
    0xD0 0
    0xD1 0
    0xD2 0
    0xD3 0
    0xD4 0
    0xD5 0
    0xD6 0
    0xD7 0
    0xD8 0
    0xD9 0
    0xDA 0
    0xDB 0
    0xDC 0
    0xDD 0
    0xDE 0
    0xDF 0
    0xE0 0
    0xE1 0
    0xE2 0
    0xE3 0
    0xE4 0
    0xE5 0
    0xE6 0
    0xE7 0
    0xE8 0
    0xE9 0
    0xEA 0
    0xEB 0
    0xEC 0
    0xED 0
    0xEE 0
    0xEF 0
    0xF0 0
    0xF1 0
    0xF2 0
    0xF3 0
    0xF4 0
    0xF5 0
    0xF6 0
    0xF7 0
    0xF8 0
    0xF9 0
    0xFA 0
    0xFB 0
    0xFC 0
    0xFD 0
    0xFE 0
    0xFF 0
  • 0 in reply to Tommy Pang
    TI__Mastermind 30515 points

    Hi, Yes, the reg. 0x1a/1b/1c doesn't indicate the bit error. So pls:

    1. measure the VS pin of UB913a and VS pin of UB914a in the same plot (you need use 2probes to measure these two signals), and observe whether the VS in UB914a is lost?

    2. if Vs is lost in UB914a, pls read the reg. 0x1a/1b/1c again.

    regards,

    Steven