SmartFusion Customizable System-on-Chip (cSoC)
Revision 10 5-3
VCCFPGAIOB5 Supply Digital supply to the FPGA fabric I/O bank 5 (west FPGA I/O bank) for the output buffers
and I/O logic.
Each bank can have a separate VCCFPGAIO connection. All I/Os in a bank will run off
the same VCCFPGAIO supply. VCCFPGAIO can be 1.5 V, 1.8 V, 2.5 V, or 3.3 V,
nominal voltage. Unused I/O banks should have their corresponding VCCFPGAIO pins
tied to GND.
VCCLPXTAL Supply Analog supply to the low power 32 KHz crystal oscillator. Always power this pin.
1
VCCMAINXTAL Supply Analog supply to the main crystal oscillator circuit. Always power this pin.
1
VCCMSSIOB2 Supply Supply voltage to the microcontroller subsystem I/O bank 2 (east MSS I/O bank) for the
output buffers and I/O logic.
Each bank can have a separate VCCMSSIO connection. All I/Os in a bank will run off
the same VCCMSSIO supply. VCCMSSIO can be 1.5 V, 1.8 V, 2.5 V, or 3.3 V, nominal
voltage. Unused I/O banks should have their corresponding VCCMSSIO pins tied to
GND.
VCCMSSIOB4 Supply Supply voltage to the microcontroller subsystem I/O bank 4 (west MSS I/O bank) for the
output buffers and I/O logic.
Each bank can have a separate VCCMSSIO connection. All I/Os in a bank will run off
the same VCCMSSIO supply. VCCMSSIO can be 1.5 V, 1.8 V, 2.5 V, or 3.3 V, nominal
voltage. Unused I/O banks should have their corresponding VCCMSSIO pins tied to
GND.
VCCPLLx Supply Analog 1.5 V supply to the PLL. Always power this pin.
VCCRCOSC Supply Analog supply to the integrated RC oscillator circuit. Always power this pin.
1
VCOMPLAx Supply Analog ground for the PLL
VDDBAT Supply External battery connection to the low power 32 KHz crystal oscillator (along with
VCCLPXTAL), RTC, and battery switchover circuit. Can be pulled down if unused.
Name Type Description
Notes:
1. The following 3.3 V supplies should be connected together while following proper noise filtering practices: VCC33A,
VCC33ADCx, VCC33AP, VCC33SDDx, VCCMAINXTAL, and VCCLPXTAL.
2. The following 1.5 V supplies should be connected together while following proper noise filtering practices: VCC,
VCC15A, and VCC15ADCx.
3. For more details on VCCPLLx capacitor recommendations, refer to the application note AC359, SmartFusion cSoC
Board Design Guidelines, the "PLL Power Supply Decoupling Scheme" section.