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Original question:

DP83822HF: DP83822 MII communication issue

DP83822I: The DP83822I can't connect with PC

Eggsy Pang
Expert 4985 points
Part Number: DP83822I

Hi team,

My customer used DP83822I design the board and the controlled is ST MCU. They wan't let ST communicate with PC by PHY.

But now DP83822I can't connect the PC and we read the (0x0001 Register) and found Link Status still 0.

BTW, SMI interface is ok because we read and write Register nomarlly. 

Do you have any suggestions? Below is the SCH.

  • 0
    TI__Mastermind 23675 points

    Hi Eggsy,

    I see no external 50 ohm pull-up resistors on TD+/- or RD+/- pins.

    This device is a current mode line driver and requires those external pull-up resistors.

  • 0 in reply to Ross Pimentel
    TI__Expert 4985 points

    Hi Ross,

    Thanks for your hlep!

    Today customer add external 50 ohm pull-up resistors on TD+/- or RD+/- pins but it doesn't help.

    Still can't connect the PC and we read the (0x0001 Register) and found Link Status still 0.

    Do you have other suggestions?

  • 0 in reply to Eggsy Pang
    TI__Expert 4985 points

    Below attached file is their proccess of Initialize DP83822. 

    lan83822.c
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    /**
    ******************************************************************************
    * @file lan83822.c
    * @author MCD Application Team
    * @version V1.0.0
    * @date 08-March-2017
    * @brief This file provides a set of functions needed to manage the LAN742
    * PHY devices.
    ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
    *
    * Redistribution and use in source and binary forms, with or without modification,
    * are permitted provided that the following conditions are met:
    * 1. Redistributions of source code must retain the above copyright notice,
    * this list of conditions and the following disclaimer.
    * 2. Redistributions in binary form must reproduce the above copyright notice,
    * this list of conditions and the following disclaimer in the documentation
    * and/or other materials provided with the distribution.
    * 3. Neither the name of STMicroelectronics nor the names of its contributors
    * may be used to endorse or promote products derived from this software
    * without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
    * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    ******************************************************************************
    */
    /* Includes ------------------------------------------------------------------*/
    #include "lan83822.h"
    #include "lan83822h.h"
    /** @addtogroup BSP
    * @{
    */
    /** @addtogroup Component
    * @{
    */
    /** @defgroup LAN83822 LAN83822
    * @{
    */
    /* Private typedef -----------------------------------------------------------*/
    /* Private define ------------------------------------------------------------*/
    /** @defgroup LAN83822_Private_Defines LAN83822 Private Defines
    * @{
    */
    #define LAN83822_SW_RESET_TO ((uint32_t)500U)
    #define LAN83822_INIT_TO ((uint32_t)2000U)
    #define LAN83822_MAX_DEV_ADDR ((uint32_t)31U)
    /**
    * @}
    */
    /* Private macro -------------------------------------------------------------*/
    /* Private variables ---------------------------------------------------------*/
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

  • 0 in reply to Eggsy Pang
    TI__Mastermind 23675 points

    Can you please read for me register 0x467 and 0x468 using extended register access?

    Also, Please measure the voltage on LED_0 and LED_1 when you force the device into reset. 

    What is the potential?