DP83869HM: DP83869HM Strap configuration details Request

Hi Balakrishna,

Can you please share a block diagram on how they are connected as well as your schematic? It would be helpful for me to understand the strap configurations you are referring to.

Thanks,

Cecilia

Dear Sir 

Thank you for reply 

please find the schematic uploaded here with sir 

it is just straight connections from Phy to Zynq MPSoC Sir

Awaiting for your early response sir 

thank you 

regards 

Balakrishna J 

Hi Balakrishna

It looks like your straps are all 4.75k, can you please share your exact Modes you need to be as well as the MAC IF? The modes are found in the datasheet. 

Do all the PHYs in each board need to be configured the same way?

We also have a TI precision labs video on how to use our bootstraps that you may review as well https://training.ti.com/ti-precision-labs-ethernet-bootstraps

Thanks,

Cecilia

Dear Sir ,

as of now all strap connections are kept open, no resister combination are mounted 

My Board has 3 DP83869HM Ethernet phys 

all three need to Operate in RGMII Mode sir  RGMII to copper 

datasheets refers mode  0,1,2,3 and op_mode 0,1 2 then  ANEG_DIS ,ANEGSEL_0,1 

this reference only problem for me and confused to configure

i will be waiting for your inputs to assemble resister values  for all three Phys sir

the default mac suggest from XILINX VITIS Tool is { 0x00, 0x0a, 0x35, 0x00, 0x01, 0x02 } from lwip ; sir 

Thank you  sir 

regards 

Balakrishna J 

Dear Sir 

waiting for your reply sir 

thank you 

regards 

Balakrishna J 

Dear Sir

waiting for your reply sir 

thank you 

Hello Balakrishna,

You need to provide more details on the functions you require. You mention that there are different modes for auto-negotiation. Does your design require auto-negotiation enabled? If so, then you will need to set ANEG_DIS, ANEGSEL_0/1 to 0. This is a 2 level strap which means in order to strap to mode 0 you need to set Rlo to 2.49k as outlined in section 9.5.1 of the datasheet.

As for RGMII to copper, those also need to be set to mode 0 which is the same strap setting and value as I mentioned above. 

To confirm your strap settings, you can read Address 0x6E to confirm your settings have been confiugred properly. Can you please read those registers and share the values?

Thanks,

Cecilia

Dear Sir,

I have tried few Combinations 

1) Trying to set all strap connections to achieve mode 0 

I observed that My board is able to auto negotiate directly with PC and  Ethernet Link down is coming 

if connect through switch (un managed  ) board not able to establish connection itself 

no auto negotiation  no thing 

i don't understand anything , I never struggled with my previous boards (many) where i have used Marvel, Realtek chips  

now paying my time for switching to TI only for  Ethernet  ,

can't i get a document like this "SNLA292–May 2018 " which is for DP83TC811, 

I really dont understand what additional information you required 

i can understand only my time running faster 

the requirement is very simple  : RGMII Connection with Copper  (1000-T link )

auto negotiation needed 

Thank you sir  

Can you please read registers 0x0 to 0x1F and 0x6E for the PHYs? I need these registers to understand and confirm the settings of the devices.

Thanks,

Cecilia

-----lwIP TCP echo server ------

TCP packets sent to port 6001 will be echoed back

Start PHY autonegotiation
Waiting for PHY to complete autonegotiation.
Auto negotiation error
Phy setup error
Phy setup failure init_emacps

Ethernet Link down

============================= XEmacPs_PHYSetup Start =============================

In XEmacPs_DetectPHY: Detected PHY address is 5

Phy Addr:5 Reg Addr :0x0 Reg Data 0x1140

Phy Addr:5 Reg Addr :0x1 Reg Data 0x7949

Phy Addr:5 Reg Addr :0x1F Reg Data 0x0

Phy Addr:5 Reg Addr :0x6E Reg Data 0xFFFF

Are you able to write to the registers through MDIO?

In our datasheet we have a similar process through register configuration. 

9.4.8.1 RGMII-to-Copper Ethernet Mode

After configuring register 0x01DF, perform the following operations.

• Write 0x1140 to register 0x0000

• Write 0x5048 to register 0x0010

• Write 0x0B00 to register 0x0009

Thanks,

Cecilia

Can you please also share your updated strap resistor values and which pins you have strapped?

Dear Sir,

Points 1: 

Present Stap Configurations  are 

LED 0  ---- Pull down with 2.49K resister

LED 1  ---- Pull down with 2.49K resister

LED 2  ---- Pull down with 2.49K resister

JTAG_TDO/GPIO_1  ---- Pull down with 2.49K resister

and others are Open --- that means not pull up/down 

Point 2)

what ever  I  do with with strap configuration  pins   -- Strap Status Register show 0xFFFF only no update is happening at this register 

Point 3) 

• Write 0x1140 to register 0x0000

• Write 0x5048 to register 0x0010

• Write 0x0B00 to register 0x0009   by the way this 0x0009 register write value is 0x1B00 not 0x0B00 

without setting (Enabling Manual Master configuration ) the 12nth bit of 0x0009 register  whatever i write in 0x0009 is not going to work for manual 

master mode configuration 

verified 100 times 

if am wrong please say wrong , in case this point is valid then please update the datasheet

Point 4) Actual Issue 

after writing 0x0009 with value of   0x01B00 the chip is able to perform auto negation with PC and router/switch and all devices 

but there is no pinging and actual communication

and Strap Status Register show 0xFFFF only  , I Dont know whats happening inside chip, my Voltages are proper 

Point 5) 

Sir,

If you are TI employee then i would like to say sorry sir, because we both are struggling sir,  please sir don't drag it 

I would request TI experts to explain strap configuration properly with schematic what happens when we make pull up/down  for each/all strap pin combinations and their modes of operation 

Hi Balakrishna,

I am sorry you are still running into this issue. After reviewing it looks like the issue is not on the straps.

You are not reading the expected registers because there is no link on your PHY. You are reading 7949 on register 0x0001.

That means there is not a proper connection between the PHY and link partner. You need to confirm that you are getting a proper link. Can you check the clock quality is okay on the crystal that it meets the PPM spec? Can you also probe the RX_CLK and make sure you see the 125MHz?

Thanks,

Cecilia

Dear Sir 

i dont know what you have reviewed 

0x0001 register default values are 0x7949 

i have checked clock in force (manual master mode ) in all speeds 2.5M, 25M, 125M 

all clock are ok  

thank you very much 

I learnt many things

my issue is not resolved 

Good bye TI 

Thank you

Hi Balakrishna,

That is correct, the default value is 0x7949 however if there is a link between devices you should be expecting bit 2 to be 1. In this read it shows that bit 2 is 0 therefore there is no link. 

Can you please confirm that you are seeing the 125MHz clock on RX_CLK? 

I am sorry your issue is still not resolved. I am trying my best to support you.

Thanks,

Cecilia

Dear Sir,

The thread has been changed  and you have missed the flow of replies 

I have told you already that  

==> if  I Connect it to PC directly,  then the value value of 0x0001 register is 0x794D and i could able to perform auto negotiation but no pinging and communication 

even in this case also 0x006E register values are 0xFFFF only  

in this case my connection are 

LED_0 == pull down with 2.49k

LED_1 == pull down with 2.49k

LED_2 == pull down with 2.49k

JTAG_TDO == pull down with 2.49k

==> if I connect to switch then the value of 0x0001 is 0x7949 and no auto negotiation also  because  chip not initialized in master mode then i started writing in 0x0009 with value 0x1B00 

then it successfully auto negotiates but  still no pinging and communication and  0x006E register values are 0xFFFF only  

 i think now it make sense to you 

in this case my connection are 

LED_0 == pull down with 2.49k

LED_1 == pull down with 2.49k

LED_2 == pull down with 2.49k

JTAG_TDO == pull down with 2.49k

THANK YOU 

REGARDS 

BALAKRISHNA J

Hi Balakrishna,

In the case where you are connecting to the PC, how are you reading the registers for 0x6E? Are you aware that there are extended registers that you need to access and they are read differently than 0X0-0x1F?

Thanks,

Cecilia

Dear Sir 

Yes, I Know extended registers accessing , please let me know the impact and behavior,  once link is UP why it wont communicate, in order to make it for communication what i should 

this is the simple question am asking 

I think we cant do it sir 

thank you 

regards

Hi Balakrishna,

Can you please provide the exact steps you are using to read the extended registers? Are other registers beyond 1F also reading back 0xFFFF?

I am wondering if it is specifically this register that is not providing the correct value or if there is some other type of communication issue that needs to be reviewed.

Thanks,

Cecilia