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DS90UB947-Q1: DS90UB947 and DS90UB940

ALPER TOPCU
Prodigy 10 points
Part Number: DS90UB947-Q1

Tool/software:

I have connected the DS90UB947 and DS90UB940 chips according to their respective datasheets. I want to connect the LVDS camera to the input and link the output to the Jetson Orin processor via CSI-2.

  1. Do I need to perform any programming in order to transfer the image?
  2. If programming is required, how can I access the drivers for the chips (DS90UB947 and DS90UB940)? My board has test points pulled up on the I2C lines of the chips.
  3. Additionally, do I need to connect the DS90UB947 to the Jetson processor via I2C?
  • 0
    TI__Genius 11560 points

    Hi,

    1) The 940 doesn't require programming but here is an example of the 947 init code. 

    2) We do not provide drivers but we provide flat I2C logs. Please refer to the init file provided.

    3) Yes. 

    Fullscreen 8838.DS90Ux947-Q1 Init Code Example Rev 1p1.py Download 
    """
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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()

    BR,

    Esther