Hi Kaushalya
- Yes, if the power supply timing sequence is wrong, it will cause the BBG to fail to start.
- On Cape, it is best not to connect the pull-down resistors on these pins of Sysboot. If it is to be connected, it must be consistent with the pull-up on BBG. For example, LCD_DATA4 (SYS_BOOT4) is connected to the BBG with a 100K pull-up resistor. Originally high level, it should also be pulled up on Cap. If 10K pull-down resistor is connected to ground, when this pin is powered on, voltage V=3.3V*[10K/(100K+10K)]=0.3 V, it is not high, it will cause the CPU to not start. Even if Delay 3V3, timing errors can’t be avoided because GND is always there.
- If you delay the gnd and vccs on the Cap, it may not work, because the power supply may be poured through the IO connected to the Cap.
- We have HDMI cape, you can refer to schematic, there is no pull up/down. <LINK_TEXT text=“https://raw.githubusercontent.com/Seeed … _Files.zip”>https://raw.githubusercontent.com/SeeedDocument/BeagleBone_Green_HDMI_Cape/master/res/Schematic_Files.zip</LINK_TEXT>
- So you want to connect to HDMI and also connector to other functions? please connect me if i am wrong. thanks.