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66AK2G02: Unused RESET pins?

Sung-IL
Mastermind 31540 points

Part Number: 66AK2G02

Dear Champs,

Could you please let me know how unused RESET pins of 66AK2G02 be handled?

e.g. when customer wants to use only PORn pins, how other RESET pins should be connected?

I found all other RESET pins connected to 3.3V VCC although I found only NMIn and RESETn should be connected VCC in datasheet.

So, I want to check how other RESET pins(LRESETn, LRESETNMIENn, RESETFULLn) should be connected or unconnected.

Thanks and Best Regards,

SI.

  • 0
    TI__Guru 65405 points
    Hi SI,

    I've forwarded this to the hardware experts. Their feedback should be posted here.

    BR
    Tsvetolin Shulev
  • 0
    TI__Guru**** 161600 points

    Hi,

    This pin does not fall under any Data Manual recommendation for unused pins. In this case, IMO, you should follow the Hardware Design Guide for Keystone II Devices (www.ti.com/.../sprabv0.pdf): 
    "5.1.4.1 Unused LRESET Pin

    If the LRESET is not used, TI recommends that it be pulled high to DVDD18 (1.8-V) with an external 4.7-k resistor to ensure that the CorePacs are not unintentionally reset. (This is a recommendation, not a requirement. It adds additional noise margin to this critical input.) The LRESETNMIEN and CORESEL inputs are also used in conjunction with the NMI to send an interrupt to one of the CorePacs. If neither LRESET or NMI are used, then it is recommended that the LRESET, NMI, and LRESETNMIEN inputs be pulled high to DVDD18 (1.8-V) with 4.7-k resistors. The CORESEL pins can be left unconnected, relying on their internal resistors to hold them in a steady state." 

    Hardware designers are notified as well, so that they can correct/confirm my understanding. 


    Best Regards, 

    Yordan

  • 0 in reply to Yordan Kovachev
    TI__Mastermind 43660 points
    Hello,

    I would also suggest to follow Keystone2 hardware design guidelines for unconnected reset pins recommendation.

    Regards,
    Senthil