Q1. Do i have to use internal DC DC converter ? I have both 5v and 3.3V regulators on board. What are the disadvantages of not using internal DC DC con. of device ? Is there any drawbacks on power management system ? Does it affect power consumption? Asleep mode? Or anything at all ? Do i have to connect inductors to sw pins if ill power device via 3.3v supply ?
Q2. This is actually simple one but i got confused so wanted to make clear. Question is about USB_VBUS pin. Datasheet states :
On the other hand example schematics on the same datasheet doesn't include neither connection vbus pins of connector and device nor 2.2uF cap. I also checked startkit's schematic. They show a connection between vbus pins And 2.2uF cap. I want my board to be powered both by USB and power jack. How should i deal with VBUS ? If im not mistaking VBUS is used both for powering and informing device of USB connectivity. If so shall i use a diode to prevent power from 5V trail back to IC when USB not connected ?The USB_VBUS pin must be connected to the USB-connector. If the system is not bus-powered, a 2.2uF capacitor to ground should be included on the VBUS pin of the USB-connector.
Q3. Can any type of softip blocks (UART ISP LAN ect. ) be created inside ic and connected to any pin of IC ? Or pins must be in some kind of order like next to each other ? Or Can any block created using pins of both tiles or all pins must be on same tile?
Thanks again
Orkhan Aliyev