TIDA-00002: Differences in TI949 register configuration data

Hui WANG

Part Number: TIDA-00002

Hi Texas Instruments team,

I have some questions I'd like to ask you. Below are two sets of TI949 register configurations, and you can see from the images that the configuration data for these two sets of registers differs.

We compared the two sets of configuration data, and the main change was in the display width information. The specific changes are as follows:

Total Horizontal Width
Total Vertical and Horizontal Widths
Total Vertical Width
Horizontal Back Porch Width
Vertical Back Porch Width
Horizontal Sync Width
Vertical Sync Width

I'd like to know if these different parameter configurations will affect the different video signals output by the deserializer. Looking forward to your reply, thank you!

Best regards!

1 day ago

0 Esther Chang 9 hours ago

TI__Genius 13890 points

Hi Hui,

The 949 is a serializer. Regardless, there is no need to change any register configurations between these two different resolutions. An example 949 init sequence is attached here.

This sequence is in Power-Up Requirements and PDB Pin on the datasheets.

Fullscreen DS90UH949-Q1 Init Code Example Rev 1p1 (2).py Download

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"""
############################
# DS90UH949-Q1 Init Code Example v1.0
# 949->948, Dual FPD-Link STP, 1920x1080@60Hz
############################

import time
import sys

# System dependant variables - adjust according to system 
UB949 = 0x18        # 949 I2C Address
UB948 = 0x68        # Remote 948 Address

def pollstate():
    count=0
    board.WriteI2C(UB949,0x23,0x80)
    board.WriteI2C(UB949,0x24,0x80)
    mask = int('11111',2)
    state = board.ReadI2C(UB949,0x24,1)
    while (state & mask) != 27:   #27 = 5'b11011
        time.sleep(0.01)  #10ms delay
        state = board.ReadI2C(UB949,0x24,1)
        count = count +1
        if count == 10:
            print "Error: Serializer is not in Normal state"
            return(1)
    
    board.WriteI2C(UB949,0x23,0x0)
    board.WriteI2C(UB949,0x24,0x0)

        

def initsequence():

    board.WriteI2C(UB949,0x03,0xDA) # Set I2C passthrough
    
    linked = 0
    retry = 0
    mask = int('10000000',2)
    while linked == 0:
        STS = board.ReadI2C(UB949,0x5A,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 #2, 3, 4
    board.WriteI2C(UB949,0x5B,0x03) # Force dual FPD-Link, disable reset on PLL frequency change 

    # Errata #7
    board.WriteI2C(UB949,0x16,0x02) # Adjust BCC watchdog timer to minimum

    state_error = pollstate()  # Poll 949 state machine prior to applying init B errata

    if state_error == 1:
        return()

    ##### Init B Sequence

    # Reset HDMI PLL after TMDS clock has stabilized 
    board.WriteI2C(UB949,0x40,0x10)
    board.WriteI2C(UB949,0x41,0x49)
    board.WriteI2C(UB949,0x42,0x10)
    board.WriteI2C(UB949,0x42,0x00)

    # Reset FPD PLL 
    board.WriteI2C(UB949,0x40,0x14)
    board.WriteI2C(UB949,0x41,0x49)
    board.WriteI2C(UB949,0x42,0x10)
    board.WriteI2C(UB949,0x42,0x00)

    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

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TIDA-00002: Differences in TI949 register configuration data