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DS90UB926QSEVB: connected to DS90UB925QSEVB does not lock

Patrick Brunner
Prodigy 60 points
Part Number: DS90UB926QSEVB
Other Parts Discussed in Thread: ALP, DS90UB925Q-Q1

Hi Team

I have the problem, that the lock-pin is toggling when i connect the EVAL boards DS90UB925QSEVB and DS90UB926QSEVB together and therefore no info is visible on the connected screen. The toggling of the Lock pin is clearly visible on the Lock LED.

The micro USB-Cable is connected to the serializer. Sometimes the ALP software can recognize the partner information in the info tab and sometimes the partner info is blanked or not found as you can see in the screenshots below.

The two EVAL board are operating in LF-Mode. That's necessary because the display allows a maximum PCLK of 10MHz. The EVAL boards are set to LF-Mode by choosing the correct resistor devider on the Mode_sel pin. When i connect the parallel input on the DS90UB925QSEVB directly to the parallel output without any EVAL board in between, then the display works.

Below you'll find some pictures of the EVAL board setup.

Does anyone know, why the Lock-Pin ist toggling? 

Thanks for your help

  • 0
    TI__Mastermind 37310 points

    Hi Patrick,

    Sorry that you encountered this issue. Can you provide me the ALP and Patch revision? Did you download the latest software from the web? If this is the first-time running the ALP, I would suggest to run the ALP under "administrator mode".

    Let me know if you still have the same issue.

    Aaron

  • 0 in reply to Aaron Heng
    Prodigy 60 points

    Hi Aaron

    Thanks for your feedback.

    I tried to run the ALP software as administrator but the same problem still exists. And yes, it's the first time I'm using this software. The ALP release 1.57.001 is running on my Windows 10 x64 computer.

    Below you can find the register readout of the serializer and deserializer using the ALP software. This might help in resolving the problem.

    [REGISTERS]
    Device = ALP Nano USB 1 - DS90UB925, Connector 1
    Comments = "For support"
    Date = 08/05/2020
    Time = 13:41:00
    Reg = 0,0x0000,0x18
    Reg = 0,0x0001,0x00
    Reg = 0,0x0003,0xDA
    Reg = 0,0x0004,0x80
    Reg = 0,0x0005,0x00
    Reg = 0,0x0006,0x5A
    Reg = 0,0x0007,0x00
    Reg = 0,0x0008,0x00
    Reg = 0,0x000A,0x00
    Reg = 0,0x000B,0x00
    Reg = 0,0x000C,0x05
    Reg = 0,0x000D,0xA0
    Reg = 0,0x000E,0x00
    Reg = 0,0x000F,0x00
    Reg = 0,0x0010,0x00
    Reg = 0,0x0011,0x00
    Reg = 0,0x0012,0x00
    Reg = 0,0x0013,0x18
    Reg = 0,0x0014,0x00
    Reg = 0,0x0015,0x00
    Reg = 0,0x0016,0xFE
    Reg = 0,0x0017,0x5E
    Reg = 0,0x0018,0xA1
    Reg = 0,0x0019,0xA5
    Reg = 0,0x0022,0x25
    Reg = 0,0x0023,0x00
    Reg = 0,0x0024,0x00
    Reg = 0,0x0025,0x00
    Reg = 0,0x0026,0x00
    Reg = 0,0x0027,0x00
    Reg = 0,0x0028,0x00
    Reg = 0,0x0029,0x24
    Reg = 0,0x002A,0x00
    Reg = 0,0x002B,0xB0
    Reg = 0,0x002C,0x00
    Reg = 0,0x0030,0x03
    Reg = 0,0x0031,0x10
    Reg = 0,0x0032,0x00
    Reg = 0,0x0033,0x00
    Reg = 0,0x0034,0x00
    Reg = 0,0x0035,0x00
    Reg = 0,0x0036,0x08
    Reg = 0,0x0037,0x34
    Reg = 0,0x0038,0x00
    Reg = 0,0x0039,0x0A
    Reg = 0,0x003A,0x20
    Reg = 0,0x003B,0x21
    Reg = 0,0x003C,0x00
    Reg = 0,0x003D,0x00
    Reg = 0,0x003E,0xF0
    Reg = 0,0x003F,0x00
    Reg = 0,0x0040,0x00
    Reg = 0,0x0041,0x00
    Reg = 0,0x0042,0x00
    Reg = 0,0x0050,0x27
    Reg = 0,0x0064,0x10
    Reg = 0,0x0065,0x00
    Reg = 0,0x0066,0x0B
    Reg = 0,0x0067,0x05
    Reg = 0,0x0068,0x30
    Reg = 0,0x0069,0x00
    Reg = 0,0x0080,0x00
    Reg = 0,0x0081,0x00
    Reg = 0,0x0082,0x00
    Reg = 0,0x0083,0x00
    Reg = 0,0x0084,0x00
    Reg = 0,0x0090,0x00
    Reg = 0,0x0091,0x00
    Reg = 0,0x0092,0x00
    Reg = 0,0x0093,0x00
    Reg = 0,0x0094,0x00
    Reg = 0,0x0098,0x00
    Reg = 0,0x0099,0x00
    Reg = 0,0x009A,0x00
    Reg = 0,0x009B,0x00
    Reg = 0,0x009C,0x00
    Reg = 0,0x009D,0x00
    Reg = 0,0x009E,0x00
    Reg = 0,0x009F,0x00
    Reg = 0,0x00A0,0x00
    Reg = 0,0x00A1,0x00
    Reg = 0,0x00A2,0x00
    Reg = 0,0x00A3,0x00
    Reg = 0,0x00C0,0x00
    Reg = 0,0x00C1,0x00
    Reg = 0,0x00C2,0x80
    Reg = 0,0x00C3,0x00
    Reg = 0,0x00C4,0x08
    Reg = 0,0x00C5,0x08
    Reg = 0,0x00C6,0x00
    Reg = 0,0x00C7,0x00
    Reg = 0,0x00C8,0x40
    Reg = 0,0x00C9,0x00
    Reg = 0,0x00CA,0x00
    Reg = 0,0x00CB,0x00
    Reg = 0,0x00CC,0x00
    Reg = 0,0x00D0,0x00
    Reg = 0,0x00D1,0x00
    Reg = 0,0x00D2,0x00
    Reg = 0,0x00D3,0x00
    Reg = 0,0x00F0,0x5F
    Reg = 0,0x00F1,0x55
    Reg = 0,0x00F2,0x42
    Reg = 0,0x00F3,0x39
    Reg = 0,0x00F4,0x32
    Reg = 0,0x00F5,0x35
    Reg = 0,0x00F6,0x00
    Reg = 0,0x00F8,0x00
    Reg = 0,0x00F9,0x00

    [REGISTERS]
    Device = ALP Nano USB 1 - DS90UB926, Connector 1
    Comments = "for support"
    Date = 08/05/2020
    Time = 14:05:24
    Reg = 0,0x0000,0x5A
    Reg = 0,0x0001,0x04
    Reg = 0,0x0002,0x00
    Reg = 0,0x0003,0xF8
    Reg = 0,0x0004,0xFE
    Reg = 0,0x0005,0x1E
    Reg = 0,0x0006,0x00
    Reg = 0,0x0007,0x18
    Reg = 0,0x0008,0x00
    Reg = 0,0x0009,0x00
    Reg = 0,0x000A,0x00
    Reg = 0,0x000B,0x00
    Reg = 0,0x000C,0x00
    Reg = 0,0x000D,0x00
    Reg = 0,0x000E,0x00
    Reg = 0,0x000F,0x00
    Reg = 0,0x0010,0x00
    Reg = 0,0x0011,0x00
    Reg = 0,0x0012,0x00
    Reg = 0,0x0013,0x00
    Reg = 0,0x0014,0x00
    Reg = 0,0x0015,0x00
    Reg = 0,0x0016,0x00
    Reg = 0,0x0017,0x00
    Reg = 0,0x0018,0x00
    Reg = 0,0x0019,0x01
    Reg = 0,0x001A,0x00
    Reg = 0,0x001B,0x00
    Reg = 0,0x001C,0x02
    Reg = 0,0x001D,0xA0
    Reg = 0,0x001E,0x00
    Reg = 0,0x001F,0x00
    Reg = 0,0x0020,0x00
    Reg = 0,0x0021,0x00
    Reg = 0,0x0022,0x42
    Reg = 0,0x0023,0x18
    Reg = 0,0x0024,0x08
    Reg = 0,0x0025,0x00
    Reg = 0,0x0026,0x83
    Reg = 0,0x0027,0x84
    Reg = 0,0x0028,0x00
    Reg = 0,0x0029,0x00
    Reg = 0,0x002A,0x00
    Reg = 0,0x002B,0x00
    Reg = 0,0x002C,0x00
    Reg = 0,0x002D,0x00
    Reg = 0,0x002E,0x00
    Reg = 0,0x002F,0x00
    Reg = 0,0x0030,0x00
    Reg = 0,0x0031,0x00
    Reg = 0,0x0032,0x10
    Reg = 0,0x0033,0x25
    Reg = 0,0x0034,0xFA
    Reg = 0,0x0035,0x00
    Reg = 0,0x0036,0x00
    Reg = 0,0x0037,0x00
    Reg = 0,0x0038,0x00
    Reg = 0,0x0039,0x00
    Reg = 0,0x003A,0x00
    Reg = 0,0x003B,0x3F
    Reg = 0,0x003C,0x00
    Reg = 0,0x003D,0xA0
    Reg = 0,0x003E,0x00
    Reg = 0,0x003F,0x10
    Reg = 0,0x0040,0x43
    Reg = 0,0x0041,0x03
    Reg = 0,0x0042,0x03
    Reg = 0,0x0043,0x00
    Reg = 0,0x0044,0x30
    Reg = 0,0x0045,0x70
    Reg = 0,0x0046,0x00
    Reg = 0,0x0047,0x00
    Reg = 0,0x0048,0x0F
    Reg = 0,0x0050,0x03
    Reg = 0,0x0051,0x10
    Reg = 0,0x0052,0x00
    Reg = 0,0x0053,0x01
    Reg = 0,0x0054,0x80
    Reg = 0,0x0055,0x00
    Reg = 0,0x0056,0x08
    Reg = 0,0x0057,0x00
    Reg = 0,0x0058,0x00
    Reg = 0,0x0059,0x3F
    Reg = 0,0x005A,0x20
    Reg = 0,0x005B,0x20
    Reg = 0,0x005C,0x00
    Reg = 0,0x005D,0x00
    Reg = 0,0x005E,0x00
    Reg = 0,0x005F,0x00
    Reg = 0,0x0060,0x00
    Reg = 0,0x0061,0x00
    Reg = 0,0x0062,0x00
    Reg = 0,0x0063,0x00
    Reg = 0,0x0064,0x10
    Reg = 0,0x0065,0x00
    Reg = 0,0x0066,0x00
    Reg = 0,0x0067,0x00
    Reg = 0,0x0068,0x00
    Reg = 0,0x0069,0x00
    Reg = 0,0x0070,0x00
    Reg = 0,0x0071,0x00
    Reg = 0,0x0072,0x00
    Reg = 0,0x0073,0x07
    Reg = 0,0x0074,0x07
    Reg = 0,0x0075,0x08
    Reg = 0,0x0076,0x00
    Reg = 0,0x0077,0x00
    Reg = 0,0x0078,0x00
    Reg = 0,0x0079,0x00
    Reg = 0,0x007A,0x00
    Reg = 0,0x007B,0x00
    Reg = 0,0x007C,0x02
    Reg = 0,0x0080,0x00
    Reg = 0,0x0081,0x00
    Reg = 0,0x0082,0x00
    Reg = 0,0x0083,0x00
    Reg = 0,0x0084,0x00
    Reg = 0,0x0090,0x00
    Reg = 0,0x0091,0x00
    Reg = 0,0x0092,0x00
    Reg = 0,0x0093,0x00
    Reg = 0,0x0094,0x00
    Reg = 0,0x0098,0x00
    Reg = 0,0x0099,0x00
    Reg = 0,0x009A,0x00
    Reg = 0,0x009B,0x00
    Reg = 0,0x009C,0x00
    Reg = 0,0x009D,0x00
    Reg = 0,0x009E,0x00
    Reg = 0,0x009F,0x00
    Reg = 0,0x00C0,0x00
    Reg = 0,0x00C1,0x00
    Reg = 0,0x00C4,0x00
    Reg = 0,0x00C5,0x00
    Reg = 0,0x00C8,0x40
    Reg = 0,0x00C9,0x00
    Reg = 0,0x00CA,0x00
    Reg = 0,0x00CB,0x00
    Reg = 0,0x00CC,0x00
    Reg = 0,0x00E0,0x00
    Reg = 0,0x00E1,0x00
    Reg = 0,0x00E2,0x00
    Reg = 0,0x00E3,0x00
    Reg = 0,0x00F0,0x5F
    Reg = 0,0x00F1,0x55
    Reg = 0,0x00F2,0x42
    Reg = 0,0x00F3,0x39
    Reg = 0,0x00F4,0x32
    Reg = 0,0x00F5,0x36
    Reg = 0,0x00F6,0x00
    Reg = 0,0x00F8,0x00
    Reg = 0,0x00F9,0x00

    Patrick

  • 0 in reply to Patrick Brunner
    TI__Mastermind 37310 points

    Hi Patrick,

    Thanks for sharing the register dump. I will review it, and back with you.

    Aaron

  • 0 in reply to Aaron Heng
    TI__Mastermind 37310 points

    Hi Patrick,

    Can you set the following register 0x2-Configuration[0] = 1 on the 926? Thanks.

    Aaron

  • 0 in reply to Aaron Heng
    Prodigy 60 points

    Hi Aaron

    Sorry for my late reply.

    I tested your suggestion but it did not help to solve the problem.

    I then tried to connect the deserializer eval board DS90UB926QSEVB directly to the serializer DS90UB925Q-Q1 built in our system. This worked fine. I could not find any differences in the registers of the chip in our system and the one on the serializer eval board. So I guess, that the serializer eval board has some problems / is not working correctly.

    We could solve our problem by just connecting the deserializer eval board and we have now implemented both chips successfully into our device.

    Patrick