• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 101 subscribers
  • Views 498 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TMS320C6424: Replacing C6421 with C6424

Mario Raffin
Expert 2355 points
Part Number: TMS320C6424
Other Parts Discussed in Thread: TMS320C6421

Hi, 

    I have a board wich mounts the TMS320C6421ZWTQ5.

This component is not available. I would like to check whether I can use the TMS320C6424WTQ5. I don't want to modify the software.

They seems to be pin to pin. The latter has a 32 bit DDR2 SDRAM interface while the fist has a 16bit DDR2 SDRAM interface. For sure the upper DDR lines are not terminated. 

Thank you. 

  • 0
    TI__Guru**** 161600 points
    Hi,

    I've not examined in details the datasheets of TMS320C6421ZWTQ5 & TMS320C6424WTQ5, but they indeed seem to be pin compatible. You should double check this before you replace the processor.

    As for your concern:
    The latter has a 32 bit DDR2 SDRAM interface while the fist has a 16bit DDR2 SDRAM interface. For sure the upper DDR lines are not terminated.

    See what has been stated in the Implementing DDR2 PCB Layout on the TMS320C6421/4 DMSoC Application Report (www.ti.com/.../spraal7c.pdf), section 1.3.7 DDR2 Signal Termination:

    "No terminations of any kind are required in order to meet signal integrity and overshoot requirements. Serial terminators are permitted, if desired, to reduce EMI risk; however, serial terminations are the only type permitted."

    So, when you make sure that devices are pin-to-pin compatible, I think you shouldn't have a problem using TMS320C6424WTQ5, without the need of changing the software.

    Best Regards,
    Yordan