Intel® Quartus® Prime Software
Intel® Quartus® Prime Design Software, Design Entry, Synthesis, Simulation, Verification, Timing Analysis, System Design (Platform Designer, formerly Qsys)
17252 Discussions

PCI Clamp Diode

Altera_Forum
Honored Contributor II
‎09-09-2008 01:23 PM
2,014 Views

Hi, 

 

Does anyone know how to disable the PCI clamp diode for individual Inputs on a Flex10KE within Quartus ?. I have the I/O configured for LVTTL but the inputs are being clamped by the clamp diode. 

 

 

Thanks 

 

 

Graham
0 Kudos

Link Copied

2 Replies
Altera_Forum
Honored Contributor II
‎09-09-2008 01:32 PM
1,123 Views

The FLEX 10KE manual tells different: 

 

--- Quote Start ---  

The PCI pull-up clamping diode, slew-rate control, and open-drain output options 

are controlled pin-by-pin via Altera software logic options. 

--- Quote End ---  

 

The actual configuration can be reviewed in the fitter resource section anyway, PCI clamp diodes should be controllable via Pin Planner or Assignment Editor as for any FPGA family.
0 Kudos
Copy link
Altera_Forum
Honored Contributor II
‎09-17-2008 01:20 PM
1,123 Views

I haven't tested it for the FLEX family, but usually you set 'PCI IO' assignment with value 'off' to disable the clamping diode.

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.