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DP83TC813R-Q1: The values of peak_sign and peak_loc_in_ meters are unstable

li quan
Intellectual 935 points
Part Number: DP83TC813R-Q1

Tool/software:

The process we handle is:

1. Read CDCR register (address 0x1Eh)
2. Set the 15th bit of the CDCR register to 1, i.e. tdr_start=1
3. Wait for 100ms
4.If the first digit is 1, i.e. tdr_done=1, then proceed to step 5; otherwise, return to step 3
5.If the 8th bit of the TDR_TC1 register (address 0x310h) is 1, then half open; If the 8th bit of the TDR_TC1 register (address 0x310h) is 0, proceed to step 6
6.If the 7th bit of the TDR_TC1 register (address 0x310h) is 0, then nominal; If the 7th bit of the TDR_TC1 register (address 0x310h) is 1, proceed to step 7
7.If the 6th bit of the TDR_TC1 register (address 0x310h) is 1, then short; If the 6th bit of the TDR_TC1 register (address 0x310h) is 0, then open
At present, we have found that when the PHY connection is disconnected, we are constantly monitoring the existence of this register, which is sometimes open and sometimes normal

  • 0
    Intellectual 935 points
    Revise the information:
    At present, we have found that when the PHY connection is disconnected, we continuously monitor the existence of this register, which is sometimes OPEN and sometimes SHORT
  • 0 in reply to li quan
    Intellectual 935 points

    When OPEN or SHORT, the value of peak_loc_in_sters is also unstable, ranging from 1 to 7m

  • 0 in reply to li quan
    TI__Prodigy 90 points

    Hello Li,

    I will test this and get back to you as soon as possible.

    Regards,

    Anagha

  • 0 in reply to Anagha Jagannath
    Intellectual 935 points

    Excuse me, is there any progress on the issue

  • 0 in reply to li quan
    TI__Prodigy 90 points

    Hello Li,

    I tested this issue internally as well as by following the steps you listed above, and was unable to recreate it. I am using the DP83TC813R-Q1 with the DP83TC812 as a link partner. 

    Would you mind sharing what your current setup is? 

    Regards,

    Anagha

  • 0 in reply to Anagha Jagannath
    Intellectual 935 points

    0x834 = 0xc001

    0x523 = 0x0001
    0x81C = 0x0fe2
    0x872 = 0x0300
    0x879 = 0x0f00
    0x806 = 0x2952
    0x807 = 0x3361
    0x808 = 0x3D7B
    0x83E = 0x045F
    0x834 = 0x8000
    0x862 = 0x00E8
    0x896 = 0x32CB
    0x03E = 0x0009
    0x01f = 0x4000
    0x523 = 0x0000

    Would you mind sharing what your current setup is? 

  • 0 in reply to li quan
    Intellectual 935 points

    Could you please provide the values of all registers in your testing environment

  • 0 in reply to li quan
    Intellectual 935 points

    All register values in our testing environment：

    reg:0x0 value:0x2100
    reg:0x1 value:0x61
    reg:0x2 value:0x2000
    reg:0x3 value:0xa211
    reg:0x10 value:0x4
    reg:0x11 value:0x10b
    reg:0x12 value:0x4000
    reg:0x13 value:0x0
    reg:0x15 value:0x0
    reg:0x16 value:0x100
    reg:0x17 value:0x0
    reg:0x18 value:0x5a25
    reg:0x19 value:0x808
    reg:0x1B value:0x0
    reg:0x1E value:0x0
    reg:0x1F value:0x0
    reg:0x41 value:0x88f7
    reg:0x133 value:0x5e0
    reg:0x17F value:0x4028
    reg:0x180 value:0x0
    reg:0x181 value:0x0
    reg:0x182 value:0x0
    reg:0x183 value:0x0
    reg:0x184 value:0x203
    reg:0x185 value:0xa
    reg:0x187 value:0x100
    reg:0x188 value:0x80
    reg:0x189 value:0x40
    reg:0x18A value:0x40
    reg:0x18C value:0x0
    reg:0x18E value:0x8004
    reg:0x300 value:0x2710
    reg:0x301 value:0x1703
    reg:0x302 value:0x45
    reg:0x303 value:0x419
    reg:0x304 value:0x30
    reg:0x305 value:0x4
    reg:0x306 value:0xa
    reg:0x310 value:0x0
    reg:0x430 value:0x770
    reg:0x450 value:0x2600
    reg:0x451 value:0x1
    reg:0x452 value:0x100
    reg:0x453 value:0x6
    reg:0x456 value:0x0
    reg:0x457 value:0x6483
    reg:0x458 value:0x1
    reg:0x45D value:0x31c8
    reg:0x45F value:0x3
    reg:0x485 value:0x1078
    reg:0x486 value:0xa05
    reg:0x489 value:0x1
    reg:0x496 value:0x44c
    reg:0x497 value:0x1c0
    reg:0x4A0 value:0x1000
    reg:0x553 value:0x0
    reg:0x560 value:0x7e4
    reg:0x561 value:0x0
    reg:0x562 value:0xfb
    reg:0x600 value:0x38
    reg:0x601 value:0x0
    reg:0x602 value:0x3
    reg:0x603 value:0x0
    reg:0x608 value:0x7b
    reg:0x609 value:0x0
    reg:0x60A value:0x323
    reg:0x60B value:0x5
    reg:0x60C value:0x24
    reg:0x60D value:0x0
    reg:0x618 value:0x0
    reg:0x619 value:0x574
    reg:0x61A value:0x5dc
    reg:0x61B value:0x7d
    reg:0x61C value:0x0
    reg:0x61D value:0x0
    reg:0x61E value:0x0
    reg:0x620 value:0x0
    reg:0x622 value:0x0
    reg:0x623 value:0x0
    reg:0x624 value:0x5511
    reg:0x625 value:0x0
    reg:0x626 value:0x0
    reg:0x627 value:0x0
    reg:0x628 value:0x0
    reg:0x629 value:0x0
    reg:0x62A value:0x0
    reg:0x639 value:0xa
    reg:0x63A value:0x0
    reg:0x63B value:0x0
    reg:0x63C value:0x0
    reg:0x63D value:0x0
    reg:0x63E value:0x0
    reg:0x648 value:0x120
    reg:0x649 value:0x0
    reg:0x64A value:0x10
    reg:0x871 value:0x0
    reg:0x1000 value:0x2100
    reg:0x1001 value:0x61
    reg:0x1007 value:0x2001
    reg:0x100B value:0x0
    reg:0x1012 value:0x0
    reg:0x1834 value:0x8000
    reg:0x1836 value:0x5008
    reg:0x3000 value:0x2100
    reg:0x3001 value:0x61

  • 0 in reply to li quan
    TI__Prodigy 90 points

    Hello Li,

    Feel free to follow the TDR test procedure described under section 7 of the following app note: https://www.ti.com/lit/an/snla389b/snla389b.pdf?ts=1721068514278&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FDP83TC812R-Q1  

    Additionally, these are all of the register values from our testing environment: 

    Register 0000 is: 2100
    Register 0001 is: 0061
    Register 0002 is: 2000
    Register 0003 is: a211
    Register 0010 is: 0004
    Register 0011 is: 010b
    Register 0012 is: e400
    Register 0013 is: 0000
    Register 0015 is: 0000
    Register 0016 is: 0100
    Register 0017 is: 0000
    Register 0018 is: 5a25
    Register 0019 is: 080a
    Register 001B is: 0000
    Register 001E is: 0000
    Register 001F is: 0000
    Register 0041 is: 88f7
    Register 0133 is: 05e0
    Register 017F is: 4028
    Register 0180 is: 0000
    Register 0181 is: 0000
    Register 0182 is: 0000
    Register 0183 is: 0000
    Register 0184 is: 0203
    Register 0185 is: 000a
    Register 0187 is: 0100
    Register 0188 is: 0080
    Register 0189 is: 0040
    Register 018A is: 0040
    Register 018C is: 0000
    Register 018E is: 8004
    Register 0300 is: 2710
    Register 0301 is: 1703
    Register 0302 is: 0045
    Register 0303 is: 0419
    Register 0304 is: 0030
    Register 0305 is: 0004
    Register 0306 is: 000a
    Register 0310 is: 0000
    Register 0430 is: 0770
    Register 0450 is: 2600
    Register 0451 is: 0001
    Register 0452 is: 0100
    Register 0453 is: 0006
    Register 0456 is: 0000
    Register 0457 is: 6483
    Register 0458 is: 0001
    Register 045D is: 318c
    Register 045F is: 0003
    Register 0485 is: 1078
    Register 0486 is: 0a05
    Register 0489 is: 0001
    Register 0496 is: 044c
    Register 0497 is: 01c0
    Register 04A0 is: 1000
    Register 0553 is: 0000
    Register 0560 is: 07e4
    Register 0561 is: 0400
    Register 0562 is: 00fb
    Register 0600 is: 0038
    Register 0601 is: 0000
    Register 0602 is: 0000
    Register 0603 is: 0000
    Register 0608 is: 007b
    Register 0609 is: 0000
    Register 060A is: 0b60
    Register 060B is: 0005
    Register 060C is: 0024
    Register 060D is: 0000
    Register 0618 is: 0000
    Register 0619 is: 0574
    Register 061A is: 05dc
    Register 061B is: 007d
    Register 061C is: 0000
    Register 061D is: 0000
    Register 061E is: 0000
    Register 0620 is: 0000
    Register 0622 is: 0000
    Register 0623 is: 0000
    Register 0624 is: 5511
    Register 0625 is: 0000
    Register 0626 is: 0000
    Register 0627 is: 0000
    Register 0628 is: 0000
    Register 0629 is: 0000
    Register 062A is: 0000
    Register 0639 is: 0000
    Register 063A is: 0000
    Register 063B is: 0000
    Register 063C is: 0000
    Register 063D is: 0000
    Register 063E is: 0000
    Register 0648 is: 0120
    Register 0649 is: 0000
    Register 064A is: 0010
    Register 0871 is: 0000
    Register 1000 is: 0000
    Register 1001 is: 0000
    Register 1007 is: 003d
    Register 100B is: 0800
    Register 1012 is: 0001
    Register 1834 is: 8000
    Register 1836 is: 0000
    Register 3000 is: 0000
    Register 3001 is: 0000

    Regards,

    Anagha 

  • 0 in reply to Anagha Jagannath
    Intellectual 935 points
    We followed the TDR testing procedure described in Section 7 of the application instructions: www.ti.com/.../snla389b.pdf -Q1
    The test results are as follows:

    dp83tc813 0x0310 reg.txt

    At present, it has been found that there is a half open circuit state in the case of an open circuit, and peak_loc_in_sters is unstable（0~3m）. However, in reality, we have not connected the PHY and the harness length is 0m

  • 0 in reply to li quan
    TI__Prodigy 90 points

    Hello Li,

    I will test this without using a cable/harness length of 0m, and get back to you tomorrow (7/18). 

    Best,

    Anagha

  • 0 in reply to Anagha Jagannath
    TI__Prodigy 90 points

    Hello Li,

    Was the TDR procedure run before every 0x0310 reg value attached in your previous message? Or were the register values changing every time they were pulled after running TDR only once?

    Additionally, is this being tested using TI's DP83TC813 EVM?

    Regards,

    Anagha

  • 0 in reply to Anagha Jagannath
    Intellectual 935 points

    We always follow this operation to set the register and read the address 0x310 register. The value of the address 0x310 register changes between 0x1C0, 0x1C1, 0x1C3, 0x0C0, 0x0C1, and 0x0C3 each time. However, the value of the address 0x310 register should be either 0x0C0 or 0x0C1 to be correct, as the length of the wiring harness is within 1 meter

    We are not using TI's DP83TC813 EVM, but our own circuit board

  • 0 in reply to li quan
    TI__Prodigy 90 points

    Hello Li,

    I will discuss this internally and get back to you early next week. 

    Best,

    Anagha

  • 0 in reply to Anagha Jagannath
    Intellectual 935 points

    Excuse me, is there any progress on the issue

  • 0 in reply to li quan
    TI__Prodigy 90 points

    Hello Li,

    At the moment, open fault detection in one wire is not distinguishable from the full cable open fault. This results in a redundancy in the half open detect feature in the DP83TC813. In order to resolve the issue you are seeing with  0x310 values, please re-run TDR with the following correction: 0x306[4] = 0. 

    This change should result in the expected register values for 0x310.

    Regards,

    Anagha