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DS90UB929-Q1: How to configure to achieve HDMI video transmission?

hui xu
Prodigy 30 points
Part Number: DS90UB929-Q1

Tool/software:

The HDMI input is connected to the DS90UB929 chip, and then transmitted via FPD-LINK to the DS90UB928 chip for LVDS output display. However, the displayed image is very blurry. How should I initialize and configure the DS90UB929 chip? Which registers need to be configured?

  • 0
    TI__Mastermind 33965 points

    Hello,

    Do you have a photo showing the blurry image output and what is the target video resolution?

    Best,

    Jack

  • 0 in reply to Jack Scherlag
    Prodigy 30 points

    blurry imagenormally projected image

    The resolution of the image is 960*480.

    The first picture shows a blurry image.(The HDMI input is connected to the DS90UB929 chip, and then transmitted via FPD-LINK to the DS90UB928 chip for LVDS output display.)

    The second picture shows a normal one.(The HDMI signal is directly connected to the projection device without going through SerDes).

    Is it because of the register configuration?Which registers of SerDes need to be configured?Thanks.

  • 0 in reply to hui xu
    TI__Mastermind 33965 points

    Hi,

    I have attached an example register configuration of the DS90UB929 that includes the recommended register settings outlined in DS90UB929 Datasheet Section 9.1.

    If you are still encountering issues with the blurry screen after adding these configurations, can you send over a copy of the DS90UB929 MainPage registers for a blurry screen and a normal screen so we can observe if there is any difference?

    For the EDID, are you manually programming the internal SRAM or using an external EEPROM?

    Fullscreen DS90Ux929-Q1 Init Code Example.py Download 
    """
  
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"""

import time

# System dependant variables - adjust according to system 
UB929 = 0x18 # 949 I2C Address

##### Init A Sequence

board.WriteI2C(UB929,0x5B,0x03) # Disable Reset on Frequency Change

board.WriteI2C(UB929,0x16,0x02) # Adjust BCC watchdog timer to minimum
board.WriteI2C(UB929,0x4,0x90) # Gate video being sent during blanking interval

##### Read State Machine Status

count = 0
board.WriteI2C(UB929,0x23,0x80)
board.WriteI2C(UB929,0x24,0x80)
mask = int('11111',2)
state = board.ReadI2C(UB929,0x24,1)
while (state & mask) != 27:   #27 = 5'b11011
    time.sleep(0.01)  #10ms delay
    state = board.ReadI2C(UB929,0x24,1)
    count = count +1
    if count == 10:
        print("Error: Serializer is not in expected state. TMDS clock may not be stabilized")
        break

board.WriteI2C(UB929,0x23,0x0)
board.WriteI2C(UB929,0x24,0x0)

##### Init B Sequence

# Reset HDMI PLL after TMDS clock has stabilized 
board.WriteI2C(UB929,0x40,0x10)
board.WriteI2C(UB929,0x41,0x49)
board.WriteI2C(UB929,0x42,0x10)
board.WriteI2C(UB929,0x42,0x00)

# Reset FPD PLL 
board.WriteI2C(UB929,0x40,0x14)
board.WriteI2C(UB929,0x41,0x49)
board.WriteI2C(UB929,0x42,0x10)
board.WriteI2C(UB929,0x42,0x00)

    Best,

    Jack

  • 0 in reply to Jack Scherlag
    Prodigy 30 points

    Thank you. I have already solved this problem.

  • +1 in reply to hui xu
    TI__Mastermind 33965 points

    I will go ahead and close this thread since the issue has been resolved.

    Thank you!