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HOW TO DESIGN A TMS570 BOARD

Tan Dat Tran
Intellectual 680 points
Other Parts Discussed in Thread: TMS570LS3137

I GOT SOME SAMPLE PART FROM TI AND DESIGNED A BOARD WITH TMS570LS3137.

I REFERENCED A BOARD FORM KEIL AND USB KIT FORM TI BUT I WHEN I PLUGGED MY JLINK, IT DID NOT WORK.

THE VOLTAGE ON nRST PIN IS NEAR 0V ALTHOUGHT I PULLED IT UP WITH A 10K RESISTOR, IT MADE JLINK LED TURN TO RED.

PLEASE HELP ME.

 

SCHEMATIC

http://www.mediafire.com/?5sq831t0dmcb8nn

 

  • 0
    TI__Mastermind 36110 points

    Hello Tan Dat Tran,

    It is difficult to locate the cause for this, since there are a lot of possible reasons for the faulty behaviour you see:

    1) Schematics 2) Layout / board design 3) Manufacturing of the board - soldering 4) Damaged device ...

    I do not know which schematics you used as reference, but if you want to develop a custom board based on the TMS570LS31x I would suggest you to have a look at the free available schematics for the TMS570 USB/HDK Kit. Since you already have your board I would compare your schematics with the schematics in the below mentioned links.

    You can find the schematics for both boards here:

    http://processors.wiki.ti.com/index.php/TMS570LS31x_HDK_Kit

    http://processors.wiki.ti.com/index.php/TMS570LS31x_USB_Kit

    Under POWER and JTAG you can see how the different voltage levels are generated and how the nRST signal is connected.

    I hope this helps you to locate or narrow down the reason for the behaviour of nRST you see.

    Best Regards,

    Gregor Fleischhauer

  • 0
    TI__Genius 13810 points

    Please pull up Pin 46, nPORRST. We did NOT implement an internal pull up. So, you need an external 1k~3Kohm resistor pull up to 3.3 V.

    Please connect TEST pin to GND. This is not critical and should not impact the functionality. But do it in the future.

    Regards,

    Haixiao

  • 0 in reply to Haixiao Weng
    Intellectual 680 points

    It works. Thank you so much !

    I forgot to pull up nPORRST. 

    I almost gave up !