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Smartreflex issue

Colin Hankins
Intellectual 570 points
Other Parts Discussed in Thread: UCD9244

I have two custom boards using the C6678. The only difference between the two boards is one has a Rev 1 C6678 and the other a Rev2. I use the UCD9244 with the 7242 for the CVDD power.

With the rev 1 silicon I do not ever see the VCNTL3 pin go low (I have a weak pull-ups on all the VCNTLs). With the Rev 2 silicon I do see the VCNTL3 pin toggle shortly after  power-up. It's VID is 0x3F which is 1.103V.

The connection between the DSP and the UCD9244 passes through a level translator. 

Why does the Smartreflex work for the Rev 2 but not the Rev 1 silicon? Could the Rev 1 be defective?

  • 0
    TI__Mastermind 30825 points

    Colin,

    Please check the Rev 1.0 device you're referring to. I suspect it is a TMX version of the silicon (Experimental, not TMS - Production.)  There was a small quantity of TMX Si that was sent out without the SmartReflex enabled.  All the TMS Rev 1.0 Si has the SmartReflex enabled. 

    Best Regards,

    Chad

  • 0 in reply to Chad Courtney
    Intellectual 570 points

    Thank you Chad. 

    The DSP has a heatsink/fan with sticky tape mounted to the part. Is there a value I can read from a register to determine if this is a TMX?

  • 0 in reply to Colin Hankins
    TI__Mastermind 30825 points

    If you pull up a memory window and capture the data in the range of 0x02620000 – 0x02620023, I can get someone to confirm if it was TMX Si or not.

    Best Regards,

    Chad

  • 0 in reply to Chad Courtney
    Intellectual 570 points

    Here you go:

    Addr 0x02620000 : 4e842901
    Addr 0x02620004 : ffffffff
    Addr 0x02620008 : a010014
    Addr 0x0262000C : 4014137
    Addr 0x02620010 : 0
    Addr 0x02620014 : 9900020
    Addr 0x02620018 : 9e02f
    Addr 0x0262001C : 0
    Addr 0x02620020 : 1500b

    The other IC's from the same order are all TMS's. So it is pretty safe to assume this one is as well. 

  • 0 in reply to Colin Hankins
    TI__Mastermind 30825 points

    I confirmed that the DIEID info shows that it was part of the small test escape in which the Smart Reflex wasn't enabled.  It is TMS, I was incorrect regarding only TMX Si having that test escape.  As long as these units are operated at 1.1V they will operate fine. That is what they ended being tested at since Smart Reflex was disabled.  Note that once this test escape was identified it was corrected.  I apologize for any inconvenience or confusion this may have caused.

    Best Regards,

    Chad

    EDIT: Just to avoid future confusion I'm adding this note.  Smart Reflex Operation is required on all Keystone I devices, there are no exceptions.  Using a fixed supply is not allowed.  In the particular case about with the specific DEIID, these units are tested and would have a fixed VID value of 1.1V and so using 1.1V is correct.