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DM816x baord termination queries

K Md Feroz Irfan
Expert 7225 points

Hi Champs,

#1:

We are designing Board with DM8168 which has small size PCB.

I have to avoid discrete as much as possible. We will be using SD Card Boot for DM8168 (BTMODE[4:0] = 10111 )

BTMODE3 will be routed out from BGA and i will add external Pull Down to it.

BTMODE0, BTMODE1, BTMODE2, BTMODE4 wont be routed out from BGA and i wont add any external termination to them.

Also, CS0BW, CS0MUX[1], CS0MUX[0], CS0WAIT  wont be routed out from BGA and i wont add any external termination to them.

#2:

EMAC[1] is not used in our design.

EMAC[1]_COL, EMAC[1]_RXER, EMAC[1]_TXCLK  can i keep these pins open?

Since these pins are marked as "PULL: IPD / DIS" which means, no internal termination after Reset.

#3:

NMI (External active low maskable interrupt) is not used in our design.

can i avoid External Pullup termination and keep this pin open?

Best Regards

Feroz

  • 0
    TI__Mastermind 46460 points

    Feroz,

    1.  This will be fine as long as PORz is used to latch the bootmode.  RESETz cannot be used to latch it.

    2.  These signals are outputs in POR and RESET active.  They can be left floating.

    3.  NMI has an internal pull in all states.  It can be left floating.

    Tom