AX2000-1CS896 datasheet(25/226 Pages) ACTEL

25 / 226 page

Axcelerator Family FPGAs

v2.7

2-11

The differential amplifier supply voltage VCCDA should be

connected to 3.3V.

A user can gain access to the various I/O standards in

three ways:

•

Instantiate specific library macros that represent

the desired specific standard

•

Use generic I/O macros and then use Actel

Designer’s PinEditor to specify the desired I/O

standards (please note that this is not applicable

to differential standards)

•

A combination of the first two methods.

Please refer to the I/O Features in Axcelerator Family

Devices application note and the Antifuse Macro Library

Guide for more details.

Table 2-8 • I/O Standards Supported by the Axcelerator Family

I/O Standard

Input/Output Supply

Voltage (VCCI)

Input Reference Voltage

(VREF)

Board Termination Voltage

(VTT)

LVTTL

3.3

N/A

LVCMOS 2.5V

2.5

N/A

LVCMOS 1.8V

1.8

N/A

LVCMOS 1.5V (JDEC8-11)

1.5

N/A

3.3V PCI/PCI-X

3.3

N/A

GTL+ 3.3V

3.3

1.0

1.2

GTL+ 2.5V*

2.5

1.0

1.2

HSTL Class 1

1.5

0.75

SSTL3 Class 1 and II

3.3

1.5

SSTL2 Class1 and II

2.5

1.25

LVDS

2.5

N/A

LVPECL

3.3

N/A

Note: *2.5V GTL+ is not supported across the full military temperature range.

Table 2-9 • Supply Voltages

VCCA

VCCI

Input Tolerance

Output Drive Level

1.5V

3.3V

1.5V

1.8V

3.3V

1.8V

1.5V

2.5V

3.3V

2.5V

1.5V

3.3V

Table 2-10 • I/O Features Comparison

I/O Assignment

Clamp Diode

Hot Insertion

5V Tolerance

Input Buffer

Output Buffer

LVTTL

Yes

Yes1

Enabled/Disabled

3.3V PCI, 3.3V PCI-X

Yes

Yes1, 2

Enabled/Disabled

LVCMOS2.5V

Yes

Enabled/Disabled

LVCMOS1.8V

Yes

Enabled/Disabled

LVCMOS1.5V (JESD8-11)

Yes

Enabled/Disabled

Voltage-Referenced Input Buffer

Yes

Enabled/Disabled

Differential, LVDS/LVPECL, Input

Yes

Enabled

Disabled3

Differential, LVDS/LVPECL, Output

Yes

Disabled

Enabled4

Notes:

1. Can be implemented with an IDT bus switch.

2. Can be implemented with an external resistor.

3. The OE input of the output buffer must be deasserted permanently (handled by software).

4. The OE input of the output buffer must be asserted permanently (handled by software).

AX2000-1CS896 Datasheet(PDF) 25 Page - Actel Corporation

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