Programmable Devices
CPLDs, FPGAs, SoC FPGAs, Configuration, and Transceivers
21597 Discussions

Driver output impedance in Arria II GX for 3.3V LVCMOS / LVTTL I/O standard

Altera_Forum
Honored Contributor II
‎03-03-2014 06:30 PM
1,535 Views

Hello, 

I understand that ARRIA II GX does NOT support output serie resistor OCT (with or without calibration) for 3.3V I/O banks. 

 

Nevertheless, I have to adapt the impedance of the line but I couldn't find anywhere the min/max values of the driver output impedance and pick the correct value for the external serie resistor, anyone can help? 

 

Thank you in advance.
0 Kudos

Link Copied

1 Reply
Altera_Forum
Honored Contributor II
‎03-04-2014 08:15 AM
505 Views

LVTTL has programmable drive strength which can be used to adjust the output impedance. There's no data sheet specification, but you can derive the expectable impedance range from the device ibis files.

0 Kudos
Copy link
Reply

Community support is provided Monday to Friday. Other contact methods are available here.

Intel does not verify all solutions, including but not limited to any file transfers that may appear in this community. Accordingly, Intel disclaims all express and implied warranties, including without limitation, the implied warranties of merchantability, fitness for a particular purpose, and non-infringement, as well as any warranty arising from course of performance, course of dealing, or usage in trade.

For more complete information about compiler optimizations, see our Optimization Notice.