Fusion and ProASIC3E I/O standards and I/O attributes applicability

The following table shows which I/O attributes apply to which I/O standards for Fusion and ProASIC3E devices. Not all I/O attributes are applicable for all I/O standards. Also, some attributes are preset and cannot be changed. Therefore, use the table below to determine which I/O attributes you can modify per I/O standard for your device.

I/O Standard

Output Drive

Slew

(output only)

Resistor

Pull

Schmitt_
trigger

(input only)

In_delay

(input
only)

Skew
(tribuf
& bibuf
only)

Output

Load

Use
register

Hot_
Swappable

 

LVTTL

X

X

X

X

X

X

X

X

X

LVCMOS 3.3

X

X

X

X

X

X

X

X

X

LVCMOS 2.5/5.0

X

X

X

X

X

X

X

X

 

LVCMOS 1.8

X

X

X

X

X

X

X

X

X

LVCMOS 1.5

X

X

X

X

X

X

X

X

X

PCI

 

 

 

X

X

X

 

X

 

PCIX

 

X

 

X

X

X

 

X

 

GTL+ 3.3

 

 

 

 

X

X

 

X

X

GTL+ 2.5

 

 

 

 

X

X

 

X

X

GTL 3.3

 

 

 

 

X

X

 

X

X

GTL 2.5

 

 

 

 

X

X

 

X

X

HSTL

Class I and II

 

 

 

 

X

X

 

X

X

SSTL2 Class I and II

 

 

 

 

X

X

 

X

X

SSTL3 Class I and II

 

 

 

 

X

X

 

X

X

LVDS

 

 

 

 

X

X

 

X

X

LVPECL

 

 

 

 

X

X

 

X

X