DS90UB947-Q1: CRC error

Betty Guo

Part Number: DS90UB947-Q1

Hi team,

customer use 947+948, the back channel frequency is 20Mbps. they found that the 947+948 unlock when work in 20Mbps, and no display. If they pull down PDB then pull up, it also can lock and display normal.

Then, they set to 5Mbps of back channel in 948 side, the 947+948 can lock and display normally.

1. we would like to know why the 5Mbps can work while 20M not? which register can be used to monitor? my understanding is that, for 5Mbps and 20Mbps, the difference is CRC error. how many CRC error will cause lost lock? The CRC error of 5M should be less than 20Mbps.

2. In additional, in old 947 d/s, the 0x01 bit 7 is the auto sleep enable or disable. in the new d/s, the 0x01 bit 7 is reserved. We want to know that for 0x01 bit 7, it is still work for disable auto sleep AND just not open to customer or the 947 don't have auto sleep function? I ask this because in another project, also with 20Mbps back channel frequency, they enable the auto sleep, found 20Mbps can't lock. if they disable auto sleep, 20Mbps can work and display normal. but in this project, they set 0x01=00, it still unlock, only change to 5M or reset PDB.

thank you.

over 4 years ago

0 Charley Cai over 4 years ago

TI__Genius 12866 points

Hi Betty,

Please try to follow this 947-948 example init script and let me know if this helps with the issue.

Fullscreen DS90Ux947-Q1 Init Code Example Rev 1p0.txt Download

"""
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"""
############################
# DS90UB947-Q1 Init Code Example v1.0
# 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 
    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()

Best Regards,

Charley Cai

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DS90UB947-Q1: CRC error