Purpose: Every I/O standard has an output drive preset; however, for some I/O standards, you can choose which one to use. The higher the drive, the faster the I/O. The faster the I/O, the more power consumed by the I/O.
|
Families |
Supported |
|
Fusion |
Yes |
|
ProASIC3E |
Yes |
|
ProASIC3 |
Yes |
|
ProASIC PLUS |
No |
|
Axcelerator |
Yes |
|
ProASIC |
No |
|
SX-A |
No |
|
SX |
No |
|
RTSX-S |
No |
|
eX |
No |
|
MX |
No |
Values: Use this attribute to set the strength of the output buffer to between 2 and 24 mA, weakest to strongest, depending on your device family. The LVTTL output buffer has four programmable settings of its drive strength. Other I/O standards have full strength.
The list of I/O standards for which you can change the output drive and the list of values you can assign for each I/O standard is family-specific. Refer to the datasheet for your device for more information.