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TMS570LC4357: MT28EW Embedded Parallel NOR flash conneccted to EMIF

john young
Intellectual 490 points
Part Number: TMS570LC4357

ok....

this is probably a stupid question....

I have my TMS570LC4357 connected up to the referenced NOR flash per Figure 21-27 in SPNU563A–March 2018....

I have checked all the power GND pins to the MT28...

checked the layout to insure no issues with PWR/GND etc.

per the TMS ref manual..all those EMIF pins should come up in tri-state mode....

I havent configured the TMS570 yet....just turning on power to a "raw chip"

the MT28EW gets hot as hell.....on every pcb when I power it up as described above ("raw TMS570 " on board....first time power up).

I'll yank the MT28E off of a board to investigate...but...just wondering if possibly some "turn on" conflict may exist when powering things up ..

again...just asking.....seems very strange....and again..have "quadruple checked" the pinouts, power rail ratings, etc etc.....everything looks "kosher"..

appreciate any response...as usual.

thank you very much

mt28ew_qlhp_128_aba_0sit.pdftms_nor.docx

  • 0
    TI__Guru**** 197006 points

    Hi John,

    Several un-used pins (RFU, DNU) are connected to internal logic. Are those pins connected to GND or VCC on your board?

  • 0 in reply to QJ Wang
    Intellectual 490 points

    negative....per the Micron data sheet:

    RFU:  reseserved for future use...recommend these be left floating

    DNU: Do not use...do not connect to any other signal or power...must be left floating...

    so....as you can see...I am very very confused...I have (or have tried) to talk to a Micron person to no avail (they dont have nice support as you guys do)...

    I'm gonna try a few things monday...disconnect VPP from 3.3V...etc....if that fails..gonna lift the chip off board....

    of note, the HERC_3.3VDC which powers all circuitry associated with the Hercules is fine....it isnt dragging down, no noise to speak of...rock solid even with this memory chip as hot as hell....weird.

    if you think of anything...I'd love to hear it...

    and as usual....thank you so much for responding in a timely manner ...you are awesome.

    jy

  • 0 in reply to john young
    TI__Guru**** 197006 points

    You are so welcome. I'm happy to help.

    If you use TI Launchpad, please be aware that the pin of J1 is 3V, but the pin 1 of J3 is 5V, so don't get confused.