AFS090 datasheet(241/334 Pages) MICROSEMI

241 / 334 page

Fusion Family of Mixed Signal FPGAs

R e visio n 2

2 - 225

Pin Descriptions

Supply Pins

GND

Ground

Ground supply voltage to the core, I/O outputs, and I/O logic.

GNDQ

Ground (quiet)

Quiet ground supply voltage to input buffers of I/O banks. Within the package, the GNDQ plane is

decoupled from the simultaneous switching noise originated from the output buffer ground domain. This

minimizes the noise transfer within the package and improves input signal integrity. GNDQ needs to

always be connected on the board to GND. Note: In FG256, FG484, and FG676 packages, GNDQ and

GND pins are connected within the package and are labeled as GND pins in the respective package pin

assignment tables.

ADCGNDREF

Analog Reference Ground

Analog ground reference used by the ADC. This pad should be connected to a quiet analog ground.

GNDA

Ground (analog)

Quiet ground supply voltage to the Analog Block of Fusion devices. The use of a separate analog ground

helps isolate the analog functionality of the Fusion device from any digital switching noise. A 0.2 V

maximum differential voltage between GND and GNDA/GNDQ should apply to system implementation.

GNDAQ

Ground (analog quiet)

Quiet ground supply voltage to the analog I/O of Fusion devices. The use of a separate analog ground

helps isolate the analog functionality of the Fusion device from any digital switching noise. A 0.2 V

maximum differential voltage between GND and GNDA/GNDQ should apply to system implementation.

Note: In FG256, FG484, and FG676 packages, GNDAQ and GNDA pins are connected within the

package and are labeled as GNDA pins in the respective package pin assignment tables.

GNDNVM

Flash Memory Ground

Ground supply used by the Fusion device's flash memory block module(s).

GNDOSC

Oscillator Ground

Ground supply for both integrated RC oscillator and crystal oscillator circuit.

VCC15A

Analog Power Supply (1.5 V)

1.5 V clean analog power supply input for use by the 1.5 V portion of the analog circuitry.

VCC33A

Analog Power Supply (3.3 V)

3.3 V clean analog power supply input for use by the 3.3 V portion of the analog circuitry.

VCC33N

Negative 3.3 V Output

This is the –3.3 V output from the voltage converter. A 2.2 µF capacitor must be connected from this pin

to ground.

VCC33PMP

Analog Power Supply (3.3 V)

3.3 V clean analog power supply input for use by the analog charge pump. To avoid high current draw,

VCC33PMP should be powered up simultaneously with or after VCC33A.

VCCNVM

Flash Memory Block Power Supply (1.5 V)

1.5 V power supply input used by the Fusion device's flash memory block module(s). To avoid high

current draw, VCC should be powered up before or simultaneously with VCCNVM.

VCCOSC

Oscillator Power Supply (3.3 V)

Power supply for both integrated RC oscillator and crystal oscillator circuit. The internal 100 MHz

oscillator, powered by the VCCOSC pin, is needed for device programming, operation of the VDDN33

AFS090 Datasheet(PDF) 241 Page - Microsemi Corporation

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