Skew

Purpose: Indicates whether there is a fixed additional delay between the enable/disable time for a tristatable I/O. (A tristatable I/O is an I/O with three output states: high, low, and high impedance.) 2 ns delay on rising edge, 0 ns delay on falling edge.   

Families

Supported

Fusion

Yes

ProASIC3E

Yes

ProASIC3

Yes

ProASIC PLUS

No

Axcelerator

No

ProASIC

No

SX-A

No

SX

No

RTSX-S

No

eX

No

MX

No

Values: You can set the skew for a clock to either on or off.  

Default value: The default skew displayed in the I/O Attribute Editor is off.

Note:  A Tri State or "tristatable" logic gate has three output states:  high, low, and high impedance. In a high impedance state, the output acts like a resistor with infinite resistance, which means the output is disconnected from the rest of the circuit.