sch-rnd - use cases 
 The Packaging problem 
 Setup 
	-  sch -> pcb flow
	
-  generic (light) symbol in the schematics (e.g. a generic IC)
	
-  footprint attribute set to a generic package (e.g. a generic BGA256)
 Problems 
	-  the pin numbering of the IC is arbitrary
	
-  the pin numbering of the Package is arbitrary
	
-  a Package+IC doesn't determine the pinout: there are various IC devices with different pinouts with the same footprint
	
-  number of logical pins may not match number of physical pins; unused pins, multiple pins connected, power and ground rings,passive componnents
	
-  Package designers will also use cschem to design the package
	
-  IC designers will also use cschem to design the bonding diagram