SmartFusion Customizable System-on-Chip (cSoC)
Revision 10 5-9
NCAP 1 Negative capacitor connection.
This is the negative terminal of the charge pump. A capacitor, with a
2.2 µF recommended value, is required to connect between PCAP and
NCAP. Analog charge pump capacitors are not needed if none of the
analog SCB features are used and none of the SDDs are used. In that
case it should be left unconnected.
PCAP 1 Positive Capacitor connection.
This is the positive terminal of the charge pump. A capacitor, with a 2.2
µF recommended value, is required to connect between PCAP and
NCAP. If this pin is not used, it must be left unconnected/floating. In this
case, no capacitor is needed. Analog charge pump capacitors are not
needed if none of the analog SCB features are used, and none of the
SDDs are used.
PTBASE 1 Pass transistor base connection
This is the control signal of the voltage regulator. This pin should be
connected to the base of an external pass transistor used with the
1.5 V internal voltage regulator and can be floating if not used.
PTEM 1 Pass transistor emitter connection.
This is the feedback input of the voltage regulator.
This pin should be connected to the emitter of an external pass
transistor used with the 1.5 V internal voltage regulator and can be
floating if not used.
MSS_RESET_N Low Low Reset signal which can be used as an external reset and can also
be used as a system level reset under control of the Cortex-M3
processor. MSS_RESET_N is an output asserted low after power-on
reset. The direction of MSS_RESET_N changes during the execution
of the Microsemi System Boot when chip-level reset is enabled. The
Microsemi System Boot reconfigures MSS_RESET_N to become a
reset input signal when chip-level reset is enabled. It has an internal
pull-up so it can be left floating. In the current software, the
MSS_RESET_N is modeled as an external input signal only.
PU_N In Low Push-button is the connection for the external momentary switch used
to turn on the 1.5 V voltage regulator and can be floating if not used.
Name Type Polarity/Bus Size Description
