Programmable Devices
CPLDs, FPGAs, SoC FPGAs, Configuration, and Transceivers
20705 Discussions

Cyclone III device AS Configuration

Altera_Forum
Honored Contributor II
‎07-22-2016 06:45 AM
854 Views

We use Cyclone III device EP3C40F780C8,configuration mode:AS Configuration (Serial Configuration Devices). 

I have a question:what states of FPGA USER I/O during Configuration? 

 

Please help me,Thank you.
0 Kudos

Link Copied

1 Reply
Altera_Forum
Honored Contributor II
‎07-22-2016 11:14 AM
172 Views

Hi, 

 

all I/O pins remain tri-stated with a weak pull-up during power-up and configuration. 

 

For more details, read the "Configuration Process" in section 9 of the Cyclone III Handbook, Volume I. 

 

Keep in mind that those "weak pull-ups" are not as weak as the name suggests; they can be as low as 7 kOhm. See "DC Characteristics" in the Cyclone III Handbook, Volume II. 

 

 

Best regards, 

GooGooCluster
0 Kudos
Copy link
Reply

Community support is provided during standard business hours (Monday to Friday 7AM - 5PM PST). 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.