Comparing 2 ports with 10kohm resistor pull up to 3.3V supply, both configured to be inputs:
GIO31 / SPI2_SOMI / SPI2_SCS[1] / CLKOUT2 - a port with IPD (internal pull down)
EM_A6 / GIO71 /KEYA2 - a port without IPD according to data sheet
Before the DM36x RESET# is released, the voltages stays at about 2.2V on both pins when measured. It seems like an internal pull down is applied on GIO71 as well.
After the DM36x #RESET is released, the voltage of GIO71 rises to near 3.3V (without IPD) and the voltage of GIO31 stays at about 2.2V due to the internal pull down. (expected behaviour)
1) May I understand form you if this is the characteristic of DM365/DM368 to hold low all the GIO pins before the RESET# is released?
2) If yes, could you direct me to which documents that this piece of information is available?
Thanks & Regards
Found the EM_WE (pin J15) & EM_OE(pin J19), both pull-up to 3.3V through 10k resistor, are showing two of the above different behaviours:
EM_WE will stay at around 2V after 3.3V is applied, but the RESET# pin is still asserted (Seems like the pin is pulled down internally with 20k impedance??). The EM_WE will only rise to 3.3V after the RESET# is released.
EM_OE will rise to 3.3V once 3.3V is applied, regardless of whether RESET# pin is released or not.
Please refer to the waveform attached.
Kindly advise if these is the characteristic of DM365/DM368?
