F_ are the Flash bus connections. The product has a spot for flash memory, but it’s not poulated:
[quote]There is a reserve extension design in the ITDB02 , thats the external flash . Its leave the pad and the pins out for the SST25VF016B Flash. So when you need , you can easily add a external flash for your project .
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LED_A is likely to be the backlight LED Anode. Therefore it needs to be connected to back_light.
One thing I note from the itead studio link is this: