DP83826E: EtherCAT out port Link detection problem

Dear TI team,

I designed a new board with AM2634 and two DP83826E(in/out).

Application of new board is based on EtherCAT example for control card form MCU+SDK am263x 8.6.00.34 with beckhoff ssc demo.

I modified this example for two DP83826E. Because this example using DP83869 and DP83826E for two EtherCAT port.

I performed some test using 'New Device' with Beckhoff devices.

Test case 1 is well working for 1 hour. But Test case 2 is something wrong.

Test case 2 is consist of one Beckhoff master and two 'New Device'(DuT #1, DuT #2).

Problem of test case 2 is that out port of DuT #1 does not maintain connection with the input port of DuT#2.

Sometime 'DuT #1' detect next device on the outport, sometime 'DuT #1' lost next device on the outport. This situation appears repeatedly.

When I change position between DuT#1 and DuT#2, exactly same problem occurred on first node output(DuT#2 out)

[Fig. 1. Test case 1 network configuration]

[Fig. 2. Test case 2 network configuration]

I confirmed this problem on the online view of 'TwinCAT2 SystemManager'. 'Fig. 3' is  online view of test case 2.

[Fig. 3. TwinCAT online monitor of test case 2]

Here is initiation code of DP83826  for this application. 

MCU+SDK am263x 8.6.00.34 has device driver for DP83826E.

So I just replace code for two DP83826E.

void tiesc_socParamsInit(bsp_params *bspInitParams)
{
    bsp_params_init(bspInitParams);
    bspInitParams->pruicss_handle = pruIcss1Handle;
    bspInitParams->interrupt_offset = tiesc_getArmInterruptOffset();
    bspInitParams->eeprom_read = tiesc_eepromRead;
    bspInitParams->eeprom_write = tiesc_eepromWrite;
    bspInitParams->spinlock_base_address = CSL_SPINLOCK0_BASE;
    bspInitParams->ethphy_init = tiesc_ethphyInit;
    bspInitParams->enhancedlink_enable = TIESC_MDIO_RX_LINK_ENABLE;
    bspInitParams->link0_polarity = TIESC_LINK0_POL; /*Polarity is high */
    bspInitParams->link1_polarity = TIESC_LINK1_POL; /*Polarity is low */
    bspInitParams->phy0_address = ((const ETHPHY_Attrs *)ETHPHY_getAttrs(CONFIG_ETHPHY0))->phyAddress;
    bspInitParams->phy1_address = ((const ETHPHY_Attrs *)ETHPHY_getAttrs(CONFIG_ETHPHY1))->phyAddress;
    bspInitParams->default_tiesc_eeprom = (const unsigned char *)(&(tiesc_eeprom));
    bspInitParams->eeprom_pointer_for_stack = &(pEEPROM);
}

void tiesc_ethphyInit(PRUICSS_Handle pruIcssHandle, uint8_t phy0addr,
                     uint8_t phy1addr, uint8_t enhancedlink_enable)
{
    uint32_t mdioBaseAddress = ((const ETHPHY_Attrs *)ETHPHY_getAttrs(CONFIG_ETHPHY0))->mdioBaseAddress;

    ETHPHY_DP83826E_LedSourceConfig ledConfig0;
    ETHPHY_DP83826E_LedBlinkRateConfig ledBlinkConfig0;
    ETHPHY_DP83826E_FastLinkDownDetectionConfig fastLinkDownDetConfig0;
    ETHPHY_DP83826E_LedSourceConfig ledConfig1;
    ETHPHY_DP83826E_LedBlinkRateConfig ledBlinkConfig1;
    ETHPHY_DP83826E_FastLinkDownDetectionConfig fastLinkDownDetConfig1;

    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY0], ETHPHY_CMD_ENABLE_AUTO_MDIX, NULL, 0);
    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY1], ETHPHY_CMD_ENABLE_AUTO_MDIX, NULL, 0);

    if(TIESC_MDIO_RX_LINK_ENABLE == enhancedlink_enable)
    {
        /*TODO: Review these 2 calls*/
        ledConfig0.ledNum = ETHPHY_DP83826E_LED0;
        ledConfig0.mode = ETHPHY_DP83826E_LED_MODE_LINK_OK;
        ledConfig1.ledNum = ETHPHY_DP83826E_LED0;
        ledConfig1.mode = ETHPHY_DP83826E_LED_MODE_LINK_OK;

        ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY0], ETHPHY_CMD_CONFIGURE_LED_SOURCE, (void *)&ledConfig0, sizeof(ledConfig0));
        ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY1], ETHPHY_CMD_CONFIGURE_LED_SOURCE, (void *)&ledConfig1, sizeof(ledConfig1));
    }

    /* Enable Extended Full-Duplex */
    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY0], ETHPHY_CMD_ENABLE_EXTENDED_FD_ABILITY, NULL, 0);
    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY1], ETHPHY_CMD_ENABLE_EXTENDED_FD_ABILITY, NULL, 0);

    /* Enable Odd Nibble Detection */
    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY0], ETHPHY_CMD_ENABLE_ODD_NIBBLE_DETECTION, NULL, 0);
    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY1], ETHPHY_CMD_ENABLE_ODD_NIBBLE_DETECTION, NULL, 0);

    /* Enable detection of RXERR during IDLE */
    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY0], ETHPHY_CMD_ENABLE_ENHANCED_IPG_DETECTION, NULL, 0);
    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY1], ETHPHY_CMD_ENABLE_ENHANCED_IPG_DETECTION, NULL, 0);

    /* PHY pin LED_0 as link for fast link detection */
    ledConfig0.ledNum = ETHPHY_DP83826E_LED0;
    ledConfig0.mode = ETHPHY_DP83826E_LED_MODE_MII_LINK_100BT_FD;
    ledConfig1.ledNum = ETHPHY_DP83826E_LED0;
    ledConfig1.mode = ETHPHY_DP83826E_LED_MODE_MII_LINK_100BT_FD;
    //ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY0], ETHPHY_CMD_CONFIGURE_LED_SOURCE, (void *)&ledConfig0, sizeof(ledConfig0));
    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY1], ETHPHY_CMD_CONFIGURE_LED_SOURCE, (void *)&ledConfig1, sizeof(ledConfig1));

    /*For DP83286E, RX_ER is a separate pin (not an LED pin like DP83869E). Configuring LED_1 for 10M speed indication. */
    ledConfig0.ledNum = ETHPHY_DP83826E_LED1;
    ledConfig0.mode = ETHPHY_DP83826E_LED_MODE_SPEED_10BT;
    ledConfig1.ledNum = ETHPHY_DP83826E_LED1;
    ledConfig1.mode = ETHPHY_DP83826E_LED_MODE_SPEED_10BT;
    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY0], ETHPHY_CMD_CONFIGURE_LED_SOURCE, (void *)&ledConfig0, sizeof(ledConfig0));
    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY1], ETHPHY_CMD_CONFIGURE_LED_SOURCE, (void *)&ledConfig1, sizeof(ledConfig1));

    /* PHY pin LED_2 as Rx/Tx Activity */
    ledConfig0.ledNum = ETHPHY_DP83826E_LED2;
    ledConfig0.mode = ETHPHY_DP83826E_LED_MODE_LINK_OK_AND_BLINK_ON_RX_TX;
    ledConfig1.ledNum = ETHPHY_DP83826E_LED2;
    ledConfig1.mode = ETHPHY_DP83826E_LED_MODE_LINK_OK_AND_BLINK_ON_RX_TX;
    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY0], ETHPHY_CMD_CONFIGURE_LED_SOURCE, (void *)&ledConfig0, sizeof(ledConfig0));
    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY1], ETHPHY_CMD_CONFIGURE_LED_SOURCE, (void *)&ledConfig1, sizeof(ledConfig1));

    ledBlinkConfig0.rate = ETHPHY_DP83826E_LED_BLINK_RATE_200_MS;
    ledBlinkConfig1.rate = ETHPHY_DP83826E_LED_BLINK_RATE_200_MS;
    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY0], ETHPHY_CMD_CONFIGURE_LED_BLINK_RATE, (void *)&ledBlinkConfig0, sizeof(ledBlinkConfig0));
    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY1], ETHPHY_CMD_CONFIGURE_LED_BLINK_RATE, (void *)&ledBlinkConfig1, sizeof(ledBlinkConfig1));

    /* Enable fast link drop detection for EtherCAT
     * Bit3: Drop the link based on RX Error count of the MII interface, when a predefined number
     * of 32 RX Error occurrences in a 10us interval is reached, the link will be dropped
     * Bit0(not enabled by following lines): Drop the link based on Signal/Energy loss indication,
     * when the Energy detector indicates Energy Loss, the link will be dropped. Typical reaction
     * time is 10us. If it needs to be enabled, set fastLinkDownDetConfig.mode as
     * (ETHPHY_DP83869_FAST_LINKDOWN_MODE_ENERGY_LOST | ETHPHY_DP83869_FAST_LINKDOWN_MODE_RX_ERR)
     */
    fastLinkDownDetConfig0.mode = ETHPHY_DP83826E_FAST_LINKDOWN_MODE_RX_ERR;
    fastLinkDownDetConfig1.mode = ETHPHY_DP83826E_FAST_LINKDOWN_MODE_RX_ERR;

    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY0], ETHPHY_CMD_ENABLE_FAST_LINK_DOWN_DETECTION, (void *)&fastLinkDownDetConfig0, sizeof(fastLinkDownDetConfig0));
    ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY1], ETHPHY_CMD_ENABLE_FAST_LINK_DOWN_DETECTION, (void *)&fastLinkDownDetConfig1, sizeof(fastLinkDownDetConfig1));

    if(enhancedlink_enable == 0)
    {
        MDIO_enableLinkInterrupt(mdioBaseAddress, 0, phy0addr, MDIO_LINKSEL_MDIO_MODE);
        MDIO_enableLinkInterrupt(mdioBaseAddress, 1, phy1addr, MDIO_LINKSEL_MDIO_MODE);
    }
    else
    {
        MDIO_enableLinkInterrupt(mdioBaseAddress, 0, phy0addr, MDIO_LINKSEL_MLINK_MODE);
        MDIO_enableLinkInterrupt(mdioBaseAddress, 1, phy1addr, MDIO_LINKSEL_MLINK_MODE);
    }

    /* Enable MII mode for DP83869 PHY */
    /* Operation mode of DP83826E is MII mode */
    //ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY0], ETHPHY_CMD_ENABLE_MII, NULL, 0);

    /* Disable 1G advertisement and sof-reset to restart auto-negotiation in case 1G link was establised */
    /* But DP83826E is not use 1G by default */
    //ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY0], ETHPHY_CMD_DISABLE_1000M_ADVERTISEMENT, NULL, 0);
    //ETHPHY_command(gEthPhyHandle[CONFIG_ETHPHY0], ETHPHY_CMD_SOFT_RESTART, NULL, 0);
}

Here is EtherCAT parts schemetic.

[Fig. 4 DP83826E]

[Fig. 5 Phy0, Phy1 Strap]

[Table. 1 Strap configuration for DP83826]

[Fig. 6 Magnetics and connector]

What is my mistake ? Could you please help me to solve this problem?