So I should not input high,low either . I undertood. Thank you. 2013年10月28日月曜日 22時14分01秒 UTC+9 Gerald: > > A. The pins cannot float. They are already terminated on the board, either > hi or lo. > > Gerald > > > > On Sun, Oct 27, 2013 at 9:46 PM, <[email protected] <javascript:>> wrote: > >> Hi, >> Please tell me about correct circuitry to use boot pins as input, >> >> I use Beaglbone Black and want to use these pins, >> especially eQep counter pins P8-33,35,41,42 that match to SYS_BOOT >> 4,5,12,13. >> >> In SRM (ver A6) p104 it says, >> "If you plan to use any of these signals, then on power up, these pins >> should not be driven." >> >> Which of below is correct circuitry? >> A) Attach pins to ground until SYS_RESETn goes high. >> B) Keep pins floated until SYS_RESETn goes high. >> >> A is easier, because it can be done by switching 1 relay pulling all pins >> to ground. >> For B, I need plenty relays. >> >> Thanks, >> Tohru >> >> >> 2013年4月12日金曜日 4時20分23秒 UTC+9 DarkHelmet: >> >>> You can absolutely use them for other usages, once the value has been >>> latched at boot they can be re purposed It may be necessary >>> to strengthen the pull up/down on those lines with external resistors >>> though. I've encountered an issue where my TTL inputs were pulling the >>> lines low at boot while the CPU latched the config, preventing it to boot >>> from the correct configuration. Resistors of ~50k seem to do the trick. >>> >>> On Friday, April 5, 2013 6:04:18 AM UTC-4, [email protected] wrote: >>>> >>>> Hi, >>>> >>>> I've a beaglebone with the XAM3359Z0Z, >>>> >>>> >>>> I discovered that there is 19 pins dedicated to the boot configuration. >>>> The documentation said that depending of the position of the switch, >>>> The beaglebone will boot with the sd card, uart, ..... . >>>> ( http://processors.wiki.ti.**com/index.php/AM335X_** >>>> StarterWare_Booting_And_**Flashing#Boot_Modes<http://processors.wiki.ti.com/index.php/AM335X_StarterWare_Booting_And_Flashing#Boot_Modes> >>>> ) >>>> >>>> >>>> I wanted to know if it is possible to use these pins for an another >>>> usage? How ? I don't need an another boot mode, the default one is enough >>>> for me. >>>> >>>> >>>> >>>> Thank you in advance for your help, >>>> >>> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> For more options, visit https://groups.google.com/groups/opt_out. >> > >
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