Package, Pinning, Pad Cells
27/56
netX 50 to netX 51/52 | Migration Guide
DOC120109MG05EN | Revision 5 | English | 2013-08 | Released | Public
2012-2013
3.3.1.5
USB
Ball Pos
Signal
Pad Type
netX
netX
netX
50/51
52
50
51/52
50
51/52
V8 U6
USB_DNEG
USB
U8 V6
USB_DPOS
USB_DPOS
or
+3.3V pull up
USB
USB with
switch able
pull up
resistor
Table 13: Differences in Pinning and Pad Cells – USB
In USB device mode the netX 50 requires an external resistor to connect USB hosts.
This resistor is activated either using a MMIO in software or via jumper during bootstrap situation.
With netX 51/52 this external resistor is not required anymore because it is included within the pad
cell and switched automatically by the USB core.
Note:
Existing designs may work together with the external resistor if activation of the internal
resistor by software is avoided. New designs should omit external resistors.