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DS90UB947-Q1EVM: TFT panel shaking

Yao YunXuan
Prodigy 200 points
Part Number: DS90UB947-Q1EVM

Hi Team,

We built a new mainboard and the TFT panel will shaking.

1:Modify the temperature parameters of 948---NG;

2:Modify the output voltage of SOC---NG;

3:Modify the output current of SOC---NG;

4:Measure the Lock Pin of 948---Always Lock;

5:Measure the V1.1 and V1.8 of 948---no abnormal conditions;

Can you get me some suggestion about this issue?

 

Best Regards!

  • 0
    TI__Expert 4160 points

    Hi Yao,

    Thank you for providing your debug steps. You mentioned that you have a new mainboard. Have you integrated the 947 into your schematic or are you using the EVMs?

    Can you provide the topology that you are using? Is the 947 and 948 connected in Dual/Single FPD modes? If single, Port 0/port1? 

    What is the 947 input/ 948 output? Dual OLDI/Single OLDI?

    Do you have any bringup scripts that you are running on the 947? 

    Could you provide a register dump of the 947 and 948?

    Is this happening to every device? How often are you seeing this happening? If it is following the device, have you done a AB swap?

    Respectfully,

    William Y.

  • 0 in reply to William Yi
    Prodigy 200 points

    Hi William,

    Thank you for replying,we had integrated the 947 into schematic.

    The 947 and 948 connected in Dual FPD mode,and we use Dual OLDI.

    What do you mean of the bringup scripts? Is the code of 947's initialization?

    It does not happen to evevy device, we had done AB swap and it following the 947.

    This is the register map of 947 and 948:

    This is the topology:

    Best Regards!

  • 0 in reply to Yao YunXuan
    TI__Expert 4160 points

    Hi Yao,

    Thank you for providing the information.

    Yes, there is a bringup script for the 947 that will code the 947 and will help setup registers and workarounds.

    Here is TI's recommended bringup script. Let me know if this helps to resolve your issues.

    Fullscreen 3771.DS90Ux947-Q1 Init Code Example Rev 1p1.txt Download 
    """
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  YOU FURTHER ACKNOWLEDGE AND AGREE THAT THE SOFTWARE AND DOCUMENTATION ARE
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"""
############################
# DS90UB947-Q1 Init Code Example v1.1
# 947->948, Dual FPD-Link STP, 1920x1080@60Hz
############################

import time
import sys

# System dependant variables - adjust according to system 
UB947 = 0x18        # 947 I2C Address
UB948 = 0x68        # Remote 948 Address
StartAmbTemp = 25   # Example temperature measured by local sensor on PCB (Ambient temp around 947). In real system this should be read back from temp sensor during initialization 
Hres = 1920         # Expected horizontal active resolution
Vres = 1080         # Expected vertical active resolution 

def pollstate():
    count=0
    board.WriteI2C(UB947,0x23,0x80)
    board.WriteI2C(UB947,0x24,0x80)
    mask = int('11111',2)
    state = board.ReadI2C(UB947,0x24,1)
    while (state & mask) != 27:   #27 = 5'b11011
        time.sleep(0.01)  #10ms delay
        state = board.ReadI2C(UB947,0x24,1)
        count = count +1
        if count == 10:
            print "Error: Serializer is not in Normal state"
            return(1)
    
    board.WriteI2C(UB947,0x23,0x0)
    board.WriteI2C(UB947,0x24,0x0)

        

def initsequence():

    board.WriteI2C(UB947,0x03,0xDA) # Set I2C passthrough
    
    linked = 0
    retry = 0
    mask = int('10000000',2)
    while linked == 0:
        STS = board.ReadI2C(UB947,0x5A,1)
        if ((STS & mask) != 0):
            linked = 1
            print "Deserializer Detected"
        else:
            time.sleep(0.1)
            retry = retry + 1
            if retry == 10:
                print "Error: No Deserializer Detected"
                return()

    board.WriteI2C(UB948,0x4A,0x01) # Disable OLDI outputs on 948 to prevent screen glitches from appearing during the init process 

    ##### Init A Sequence

    # Errata #5 and 6
    board.WriteI2C(UB947,0x5B,0x03) # Force dual FPD-Link, disable reset on PLL frequency change 

    # Errata #10
    board.WriteI2C(UB947,0x16,0x02) # Adjust BCC watchdog timer to minimum

    # Errata #11
    board.WriteI2C(UB947,0x04,0x90) # Prevent AVMUTE for non-HDCP systems



    state_error = pollstate()  # Poll 947 state machine prior to applying init B errata

    if state_error == 1:
        return()

    ##### Init B Sequence 

    # # Errata #2 (only for older non-eFuse devices)
    # board.WriteI2C(UB947,0x40,0x10)
    # board.WriteI2C(UB947,0x41,0x4A)
    # board.WriteI2C(UB947,0x42,0x3F)
    # board.WriteI2C(UB947,0x41,0x4B)

    # if StartAmbTemp < 10:
    #     board.WriteI2C(UB947,0x42,0x88)
    # else:
    #     board.WriteI2C(UB947,0x42,0x89)
    # board.WriteI2C(UB947,0x41,0x49)
    # board.WriteI2C(UB947,0x42,0x10)
    # board.WriteI2C(UB947,0x42,0x00)
    # board.WriteI2C(UB947,0x40,0x14)
    # board.WriteI2C(UB947,0x41,0x4A)
    # board.WriteI2C(UB947,0x42,0x3F)
    # board.WriteI2C(UB947,0x41,0x4B)
    # if StartAmbTemp < 10:
    #     board.WriteI2C(UB947,0x42,0x88)
    # else:
    #     board.WriteI2C(UB947,0x42,0x89)
    # board.WriteI2C(UB947,0x41,0x49)
    # board.WriteI2C(UB947,0x42,0x10)
    # board.WriteI2C(UB947,0x42,0x00)

    # Errata #3 
    board.WriteI2C(UB947,0x40,0x10)
    board.WriteI2C(UB947,0x41,0x49)
    board.WriteI2C(UB947,0x42,0x16)
    board.WriteI2C(UB947,0x41,0x47)
    board.WriteI2C(UB947,0x42,0x20)
    board.WriteI2C(UB947,0x42,0xA0)
    board.WriteI2C(UB947,0x42,0x20)
    board.WriteI2C(UB947,0x42,0x00)
    board.WriteI2C(UB947,0x41,0x49)
    board.WriteI2C(UB947,0x42,0x00)

    time.sleep(0.01)

    ##### Timing Confirmation 

    retry = 0
    Hconfirm = 0
    Vconfirm = 0
    while (retry < 3):
        board.WriteI2C(UB948,0x68,0x08) # Enable PATGEN BIST
        time.sleep(0.1) # Critical time delay - do not adjust to a shorter value 
        board.WriteI2C(UB948,0x68,0x19) # H active High monitor
        Hhigh = board.ReadI2C(UB948, 0x69, 1)
        board.WriteI2C(UB948,0x68,0x09) # H active Low monitor
        Hlow = board.ReadI2C(UB948, 0x69, 1)
        board.WriteI2C(UB948,0x68,0x39) # V active High monitor
        Vhigh = board.ReadI2C(UB948, 0x69, 1)
        board.WriteI2C(UB948,0x68,0x29) # V active Low monitor
        Vlow = board.ReadI2C(UB948, 0x69, 1)
        board.WriteI2C(UB948,0x68,0x00) # Disable PATGEN BIST

        mask = int('00111111',2)

        hlowmask = Hlow & mask
        hhighmask = Hhigh & mask
        vlowmask = Vlow & mask
        vhighmask = Vhigh & mask


        hhighmask = hhighmask << 6
        vhighmask = vhighmask << 6

        Hactive = hhighmask | hlowmask
        Vactive = vhighmask | vlowmask

        if Hactive != Hres:
            retry  = retry + 1
            board.WriteI2C(UB947,0x40,0x10) # Reset OLDI PLL
            board.WriteI2C(UB947,0x41,0x49)
            board.WriteI2C(UB947,0x42,0x16)
            board.WriteI2C(UB947,0x41,0x47)
            board.WriteI2C(UB947,0x42,0x20)
            board.WriteI2C(UB947,0x42,0xA0)
            board.WriteI2C(UB947,0x42,0x20)
            board.WriteI2C(UB947,0x42,0x00)
            board.WriteI2C(UB947,0x41,0x49)
            board.WriteI2C(UB947,0x42,0x00)
            time.sleep(0.1)
        else:
            Hconfirm = 1
        if Vactive != Vres:
            retry  = retry + 1
            board.WriteI2C(UB947,0x40,0x10) # Reset OLDI PLL
            board.WriteI2C(UB947,0x41,0x49)
            board.WriteI2C(UB947,0x42,0x16)
            board.WriteI2C(UB947,0x41,0x47)
            board.WriteI2C(UB947,0x42,0x20)
            board.WriteI2C(UB947,0x42,0xA0)
            board.WriteI2C(UB947,0x42,0x20)
            board.WriteI2C(UB947,0x42,0x00)
            board.WriteI2C(UB947,0x41,0x49)
            board.WriteI2C(UB947,0x42,0x00)
            time.sleep(0.1)
        else:
            Vconfirm = 1
        if (Hconfirm == 1) and (Vconfirm == 1):
            break

    if (retry > 2):
        print "Error: Timing confirmation failed. Double check expected video resolution and OLDI video input"  
        return()
    else:
        print "Initialization Complete"
        board.WriteI2C(UB948,0x01,0x01) # Digital reset to restart AEQ 
        time.sleep(0.1) # Allow time for 948 to relock 
        board.WriteI2C(UB948,0x4A,0x00) # Enable OLDI outputs on 948

initsequence()

    Additionally, are you seeing this screen shaking upon startup? How often does this particular 947 do this screen shaking? Under what conditions is it performing the screen shacking?

    Respectfully,

    William Y.

  • 0 in reply to William Yi
    Prodigy 200 points

    Hi William,

    Thank you for replying,the script does not fix our issue.We see the screen shaking since it startup, the shaking frequency of this particular 947 is almost 500ms once.

    Wether we can use the intertal clock of 947 in normal operating mode?

    Best Regards!

  • +1 in reply to Yao YunXuan
    TI__Expert 4160 points

    Hi Yunxuan,

    Thank you for your verification!

    Do you have the driver code that you implemented this code with? Could you attach it so that I can see the code?

    Can you take a video of the flickering screen so that we can see what kind of issue we may be seeing?

    Can you run local patgen on the 948 and see if the issue still persists?

    Can you run 947 patgen and see if the issue still persists?

    No, the internal clock on the 947 is used for BIST only and is used in the absence of OpenLDI clock.

    Respectfully,

    William Y.

  • 0 in reply to William Yi
    Prodigy 200 points

    Hi William,

    We had fixed this issue,the video IC causing this bug, thanks for you reply.

    Best Regards.