iMXRT1020(100Pin) JTAG_TDO pin conflict with ENET_MDIO

cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

iMXRT1020(100Pin) JTAG_TDO pin conflict with ENET_MDIO

726 Views
topkinschen
Contributor II

Hi

     See attached pic snapped from 1020 reference manual.

     GPIO_AD_B0_04 has to work as JTAG_TDO and ENET_MDIO at the same time since 100pin 1021 does not have GPIO_EMC_40 & GPIO_SD_B0_02?

    if so, what if signals transmit on JTAG and ENET at the same time?

    OR does this means that i can only use swd to debug when enet used?

    please help. thks.

pastedImage_2.png

pastedImage_1.png

3 Replies

562 Views
Yuri
NXP Employee
NXP Employee

Hello,

 

   It is not possible to use different functionality, such as  JTAG_TDO and ENET_MDIO 

on the same pin simultaneously.  So, when customers use SWD to debug,  ENET_MDIO

cannot  be used. 

Have a great day,

Yuri

 

------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer

button. Thank you!

562 Views
topkinschen
Contributor II

Hi  Yuri

      thanks for help.

      but i think what you say is not right. JTAG conflict with ENET_MDIO pin, but SWD doesn't.

so SWD can only be used for debug when ENET used.

    am i right?

562 Views
Yuri
NXP Employee
NXP Employee

Hello,

   Correct, the SWD signals (JTAG_TMS/TCK) do not conflict with Ethernet ones,

and may be used.

Regards,

Yuri.

0 Kudos