AFS090 datasheet(245/334 Pages) MICROSEMI

245 / 334 page

Fusion Family of Mixed Signal FPGAs

R e visio n 2

2 - 229

Special Function Pins

No Connect

This pin is not connected to circuitry within the device. These pins can be driven to any voltage or can be

left floating with no effect on the operation of the device.

Don't Connect

This pin should not be connected to any signals on the PCB. These pins should be left unconnected.

NCAP

Negative Capacitor

Negative Capacitor is where the negative terminal of the charge pump capacitor is connected. A

capacitor, with a 2.2 µF recommended value, is required to connect between PCAP and NCAP.

PCAP

Positive Capacitor

is where the positive terminal of the charge pump capacitor is connected. A capacitor,

with a 2.2 µF recommended value, is required to connect between PCAP and NCAP.

PUB

Push Button

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.

PTBASE

Pass Transistor Base

is the control signal of the voltage regulator. This pin should be connected to the

base of the external pass transistor used with the 1.5 V internal voltage regulator and can be floating if

not used.

PTEM

Pass Transistor Emitter

is the feedback input of the voltage regulator.

This pin should be connected to the emitter of the external pass transistor used with the 1.5 V internal

voltage regulator and can be floating if not used.

XTAL1

Crystal Oscillator Circuit Input

Input to crystal oscillator circuit. Pin for connecting external crystal, ceramic resonator, RC network, or

external clock input. When using an external crystal or ceramic oscillator, external capacitors are also

recommended (Please refer to the crystal oscillator manufacturer for proper capacitor value).

If using external RC network or clock input, XTAL1 should be used and XTAL2 left unconnected. In the

case where the Crystal Oscillator block is not used, the XTAL1 pin should be connected to GND and the

XTAL2 pin should be left floating.

XTAL2

Crystal Oscillator Circuit Input

Input to crystal oscillator circuit. Pin for connecting external crystal, ceramic resonator, RC network, or

external clock input. When using an external crystal or ceramic oscillator, external capacitors are also

recommended (Please refer to the crystal oscillator manufacturer for proper capacitor value).

If using external RC network or clock input, XTAL1 should be used and XTAL2 left unconnected. In the

case where the Crystal Oscillator block is not used, the XTAL1 pin should be connected to GND and the

XTAL2 pin should be left floating.

Security

Fusion devices have a built-in 128-bit AES decryption core. The decryption core facilitates highly secure,

in-system programming of the FPGA core array fabric and the FlashROM. The FlashROM and the FPGA

core fabric can be programmed independently from each other, allowing the FlashROM to be updated

without the need for change to the FPGA core fabric. The AES master key is stored in on-chip nonvolatile

memory (flash). The AES master key can be preloaded into parts in a security-protected programming

environment (such as the Microsemi in-house programming center), and then "blank" parts can be

shipped to an untrusted programming or manufacturing center for final personalization with an AES-

encrypted bitstream. Late stage product changes or personalization can be implemented easily and with

AFS090 Datasheet(PDF) 245 Page - Microsemi Corporation

AFS090 Datasheet(HTML) 245 Page - Microsemi Corporation

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