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]> 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]. > For more options, visit https://groups.google.com/groups/opt_out. > -- 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]. For more options, visit https://groups.google.com/groups/opt_out.
