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DS90UB935-Q1: TI954-TI935 with 935 AON mode

John Will
Prodigy 10 points
Part Number: DS90UB935-Q1

Tool/software:

This is the first time we have used 935 internal AON clock  mode.We designed 3 different modules  with 935's AON mode.Both of them 935's GPIO0 output  frame-sync signal for sensor.

The camera displayed only 6 frame.So we tested the 935's GPIO0 and 954's GPIO0,both of them are 6Hz PWM signals.We controled GPIO0 of 954 disable input,after that,enable 954 GPIO0 output.

However, at CSI-2 Synchronous mode, we can config 935's GPIO0 and 954's GPIO0 as 30Hz PWM pulse .

So internal AON clock affects the configuration of GPIO0? PLZ change GPIO0 to output 30Hz PWM signal.

The following are our configurations.We need your help.THANKS

[ParaList]
//***********configure 954 **************
0xffff,0xFF,//delay 255mS
0xfff8,0x60, // switch device address to 0x60 to configure 954
0xffff,0xFF,//delay 255mS
0x4c,0x01, // Port 0 Writes enabled//
0x5c,0x30, //set 935 Slave Device ID
0x5d,0x44, //set sensor Slave Device ID
0x5e,0xa0,
0x5f,0xb0,
0x65,0x44,
0x66,0xA0,
0x67,0xB0,
0x6d,0x7c, //Configure port to coax mode and FPD III to CSI mode
0x7d,0x01,
0x0F,0x7E, //disable GPIO0 input
0x10,0x91,
0x32,0x01, // csi port0 config enable
0x33,0x03, // 4 lane enable csi for csi port0
0x1f,0x02, // csi speed
0x20,0xE0, //forwarding of RX0 to CSI0
//RX
0x4C,0x01,
0x6E,0xAA,
0x10,0x91,
0x19,0x20,
0x1A,0x8D,
0x1B,0xB8,
0x1C,0x77,
0x18,0x01,
0xffff,0xFF,
0xfff8,0x60,// device address to 0x60 to configure 954
0x58,0x7a, //assert AUTO_ACK_ALL for remote I2C writes to 935
0x5C,0x31, //assert SER_AUTO_ACK for remote I2C writes to 935

//*********** configure TI935 **************
0xffff,0xFF,//delay 255mS
0xfff8,0x30, //// switch device address to 0x30 to configure 935
0xffff,0xFF,
0x05,0x0B //Open internal AON CLK
0x03,0x13 //add
0x01,0x01 //add
0x01,0x03, //RST
0x02,0x73, //Continuous Clock 4-line I2C 1.8V
//0x03,0x10, //CSI-2 Non-synchronous external clock Mode
0x32,0x89, //I2C Pass-Through All
0x06,0x6a,
0x07,0xf2,
0x0E,0x3c, //GPIO HIGH
0x0D,0xd0, //GPIO HIGH
0x05,0x38, //Internally generated OSC clock

//***********configure 954 **************
0xffff,0xFF,//delay 255mS
0xfff8,0x60, //switch device address to 0x60 to configure 954
0xffff,0xFF,//delay 255mS
0x58,0x5A, //deassert AUTO_ACK_ALL now that 935 AON config is complete
0x5C,0x30, //deassert SER_AUTO_ACK now that 935 AON config is complete

//*********** configure TI935 **************
0xffff,0xFF,
0xfff8,0x30, //Ser SlaveID 0x30
0xffff,0xFF,
0x0e,0x30,
0x02,0x73
0xffff,0xff
0x0d,0xd0,

  • 0
    TI__Guru 66810 points

    Hello, 

    Due to US public holiday, support will resume on Tuesday, September 2nd. Thank you for your patience. 

    Regards, 

    Logan

  • +1 in reply to Logan Cummins
    TI__Mastermind 24711 points

    Hi John,

    Thanks for reaching out with this question. In this case the difference could be that the back-channel rate in AON / non sync mode is 10Mbps rather than 50Mbps in sync mode (defined in register 0x58). Frame sync is dependent on the back channel clock, so if the back channel rate has changed the FS low and FS high times also will need to be changed.

    Have you tried to update the FS_LOW and FS_HIGH registers for the two different back channel rates?

    Best,

    Thomas

  • 0 in reply to Thomas Bejin
    Prodigy 10 points

    Hi Thomas,

    Thank you very much for your technical support，I change 954's register 0x58=0x5A to 0x58=0x5E,the FSYNC becomed 30HZ. and the camera displayed 30fps.However, the camera is not working stably. It stops generating images after displaying for several minutes. How should I solve this problem?

    Now we use  935 AON  mode(CS1-2 Non-synchronous-FPD-Link lllClock reference derived from internalAON clock.),howerver,954 0x58=0x5E[2~0=110] is for  50 Mbps (default for DS90UB953 CSl Synchronous backchannel compatibility),Are they compatible?

  • 0 in reply to John Will
    TI__Mastermind 24711 points

    Hi John,

    In this case the 0x58 register should still be left at 0x5A, but the FS low and high times should be adjusted accordingly to match 30Hz. 

    Have you read back any diagnostics when the video issue is observed? 0x4d,0x4E,0x55,0x56,0x7A, and 0x7B are a good place to start. Please read these registers back twice when the error occurs (once to read any sticky flags & second time to see if they're still asserted).

    Best,

    Thomas