AX2000 datasheet(23/262 Pages) MICROSEMI

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Axcelerator Family FPGAs

Re vi s i on 18

2-9

I/O Specifications

Pin Descriptions

Supply Pins

GND

Ground

Low supply voltage.

VCCA

Supply Voltage

Supply voltage for array (1.5V). See "Operating Conditions" on page 2-1 for more information.

VCCIBx

Supply Voltage

Supply voltage for I/Os. Bx is the I/O Bank ID – 0 to 7. See "Operating Conditions" on page 2-1 for more

information.

VCCDA

Supply Voltage

Supply voltage for the I/O differential amplifier and JTAG and probe interfaces. See "Operating

Conditions" on page 2-1 for more information. VCCDA should be tied to 3.3V.

VCCPLA/B/C/D/E/F/G/H

Supply Voltage

PLL analog power supply (1.5V) for internal PLL. There are eight in each device. VCCPLA supports the

PLL associated with global resource HCLKA, VCCPLB supports the PLL associated with global resource

HCLKB, etc. The PLL analog power supply pins should be connected to 1.5V whether PLL is used or not.

VCOMPLA/B/C/D/E/F/G/H Supply Voltage

Compensation reference signals for internal PLL. There are eight in each device. VCOMPLA supports

the PLL associated with global resource HCLKA, VCOMPLE supports the PLL associated with global

resource CLKE, etc. (see Figure 2-2 on page 2-9 for correct external connection to the supply). The

VCOMPLX pins should be left floating if PLL is not used.

VPUMP

Supply Voltage (External Pump)

In the low power mode, VPUMP will be used to access an external charge pump (if the user desires to

bypass the internal charge pump to further reduce power). The device starts using the external charge

pump when the voltage level on VPUMP reaches VIH1. In normal device operation, when using the

internal charge pump, VPUMP should be tied to GND.

When VPUMP = VIH, it shuts off the internal charge pump. See "Low Power Mode" on page 2-106.

Figure 2-2 •

VCCPLX and VCOMPLX Power Supply Connect

1.5 V Supply

Axcelerator Chip

0.1 μf

10 μf

250

VCCPLX

VCOMPLX

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