Forum Discussion
Occasional ContributorWarning (169180): Following 4 pins must use external clamping diodes.
Hi Alex Halfin,
if you see in fig. 8 - 28 it has two headers. one for JTAG mode header and another one AS mode header. if you following combine the AS configuration scheme with the JTAG-based configuration then follow fig. 8-28 schematic or following programming of a serial configuration device with the JTAG interface then AS mode header and those diodes are not required.
Cyclone IV Device Handbook pdf link attaching here
https://www.ee.ryerson.ca/~courses/ee8205/Data-Sheets/sopc/cyclone4-handbook.pdf
Thank you
Hareesh.
Frequent Contributorhi HAlex,
please go through given article link. you can find out Warning (169180): Following pins must use external clamping diodes details.
link :
https://www.intel.in/content/www/in/en/support/programmable/articles/000077750.html
thanks,
HAlexHello
In my board the connection made exactly by Handbook recommendation (figure 8-29):
There are no diodes mentioned in Cyclone IV Handbook.
I raised the diode's question only after getting a Quartus warning (and this is after the board's layout is finished and the board is at production now).
Diode's are shown in Handbook only in connection with additional header like on figure 8-28.
My question: is the Quartus warning related only to connections described like on figure 8-28 and it is not relevant to my case?
Thank you
Alex
- hareesh
Hi Alex Halfin,
if you see in fig. 8 - 28 it has two headers. one for JTAG mode header and another one AS mode header. if you following combine the AS configuration scheme with the JTAG-based configuration then follow fig. 8-28 schematic or following programming of a serial configuration device with the JTAG interface then AS mode header and those diodes are not required.
Cyclone IV Device Handbook pdf link attaching here
https://www.ee.ryerson.ca/~courses/ee8205/Data-Sheets/sopc/cyclone4-handbook.pdf
Thank you
Hareesh.
