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.

dm385 boot pins question

Other Parts Discussed in Thread: DM385

hi all

dm385 has a lot of boot pins , the btmode[4:0] defines the boot device , and the btmode[6:5] is reserved and must be pulled down , and the btmode[15:7] used to define other things as follows .

btmode[15:12] : used for NAND/NOR-Boot

btmode[9:7] : used for EMAC-Boot

btmode[10] : GPMC option A/B

btmode[11] :  nRSOUT_WD_OUT mode

my question is :

if we use only SD/MMC Boot mode, we set the BTMODE[4:0] = 10111 , the boot sequence is MMC-SPI-UART-EMAC , can i left the btmode[15:7] pins unconnect?

it will perform hi-Z mode as input state when powered up .

  • Hi ng2362,

    ng2362 said:

    if we use only SD/MMC Boot mode, we set the BTMODE[4:0] = 10111 , the boot sequence is MMC-SPI-UART-EMAC , can i left the btmode[15:7] pins unconnect?

    it will perform hi-Z mode as input state when powered up .

    These are input pins, and for unused input pins, the internall pull resistor should be enabled or external pull resistor should be used to prevent floating inputs. See DM385 datahseet, section 4.4 Handling Unused Pins

    BR
    Pavel

  • I will move this thread to the correct e2e forum (DM814x).