• State
  • Locked Locked
  • Replies 4 replies
  • Subscribers 100 subscribers
  • Views 112 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

TMS320C6748: TMS320C6748 HPI

T.Nishimura
Prodigy 10 points
Part Number: TMS320C6748

Tool/software:

The T18 pin of the TMS320C6748 functions as CLKOUT and UHPI_HDS2.
Because I would like to use the CLKOUT function as well, I will not use UHPI_HDS2 and will use only UHPI_HDS1 to control the HPI.
The HPI guidelines state:
==========
Hosts with separate read and write strobes connect these strobes to either HDS1 or HDS2. Hosts with a single data strobe connect that strobe to either HDS1 or HDS2, with the unused pin tied high.
============

I understand that UHPI_HDS2 is not valid when using CLKOUT, but how should UHPI_HDS2 be handled?
Could you please tell me how to use and connect if I only want to use HDS1?
If I don't enable it as UHPI_HDS2, will it be impossible to use it for HPI communication?

  • 0
    TI__Prodigy 740 points

    Hello Nishimura,

    I am forwarding your request to a TI expert on TMS320C6748 for further analysis.

    Please expect an update by one or two days.

    I appreciate your patience.

    Kind Regards,

    Anastas Yordanov 

  • 0 in reply to Anastas Yordanov
    Prodigy 10 points

    Hello Anastas Yordanov, 

    Thank you for your response.

    I look forward to hearing from you.

    Nishimura

  • 0
    TI__Mastermind 28035 points
    T.Nishimura said:
    I understand that UHPI_HDS2 is not valid when using CLKOUT, but how should UHPI_HDS2 be handled?

    Normally,  when a muxed input signal is not selected, it will be internally driven to an inactive value. Therefore, I would expect that the UHPI_HDS2 input will be driven high when pin T18 is configured for a signal other than UHPI_HDS2.  However, I am not able to confirm this.

    T.Nishimura said:
    Could you please tell me how to use and connect if I only want to use HDS1?

    See first answer. 

    T.Nishimura said:
    If I don't enable it as UHPI_HDS2, will it be impossible to use it for HPI communication?

    See above answers. 

    Did you see note 4 in table 3-6 of the datasheet?  It states the following:

    Note: The CLKOUT clock output is provided as PLL observation clock, and is provided for debug purposes only. It may be routed to a
    test point, but should never be connected to a load.

    --Paul 

  • 0 in reply to PaulM
    Prodigy 10 points

    Hello Paul,

    Thank you for your assistance.
    I acknowledge and understand your response.

    Best regards,
    Nishimura