Trying to find answers in all documents but could not find would love for some urgent assisting here:
Power up/down sequence (DS V1.2 chapter 2.2)
1.1 regarding power-up/down sequence requirement - module relative to the carrier (module should power up first and power down last):
1.1.1 is this required for latchup protection?
1.1.2 does this requirement apply also for the PCIe endpoint? - i have no control on the power of the PCI endpoint power…
1.1.2 does this requirement apply also for the USB/HDMI device? - should the 5V power on the USB/HDMI connector be powered up/down together with the other carrier rails on a power-up/down sequence?
(i.e. on a CARRIER_POWER_ON assertion/de-assertion)
1.2 the PU sequence of the DS (figure 3) shows that the SYS_RESET_N is deasserted by the GPU at the end of the PU sequence,
can you please supply a timing diagram for this event? (is it a fixed value after CARRIER_POWER_ON signal assertion event?)
1.3 the PD sequence of the DS (figure 4) shows that VDDIN_BAD is asserted low together with SYS_RESET_N.
does this figure show a power down sequence due to a fault in the VIN voltages?
according to figure 4, the module is powered down first and only then the carrier power rails , this is in contradiction to the text description of section 2.2.2
that specifically mentions that the CARRIER_POWER_ON is deasserted first and only then the module disables its power(i suppose that this occurs only when the carrier
power controller de-asserts the MODULE_POWER_ON signal, right?)
please advise on this contradiction.
this signal enters the SOC ,what is it needed for? (What is the required timing of assertion ?)
we don’t intend to put the GPU into sleep, In this case, can I leave the PWR_BTN_N floating?
figure 3 in DS(V1.2) for power-up sequence shows that the power button is pressed after HV&MV&PWR_BAD are all in their
required state, this contradicts figure 5-2 (OEM DG V2.2) – there it is pressed BEFORE.
Please advise – which is correct?
** there shall be no button in our design , can we just initiate power ON event to the module by asserting only MODULE_PWR_ON signal to module ?
4.VCC_RTC not used in my design – what to do with this pin? leave unconnected?
5.USB(2.0 only in our design):
USB0 - shall be used for recovery mode only.
should I disconnect the USB connector from power in our carrier design and connect only GND+diff data pair?