Forum Discussion
New ContributorCyclone V nRST assertion upon nPOR
Hi,
Apologies for the delay in getting back and thanks for cross-checking the older HPS TRM.
From newer TRM document, asserting nPOR does not drive the nRST pin low on Cyclone V. nPOR requests a cold reset while the Reset Manager drives nRST low (via rst_pin_rst_n) only during a warm reset.
Current Cyclone V HPS TRM (683126 21.2) lists rst_pin_rst_n under Warm Reset only, and an Altera KDB documents that the old handbook wording about cold/POR driving HPS_nRST was incorrect.
You can refer to the sections below (took the screenshot above from here)
https://docs.altera.com/r/docs/683126/21.2/cyclone-v-hard-processor-system-technical-reference-manual/module-reset-signals
https://docs.altera.com/r/docs/683126/21.2/cyclone-v-hard-processor-system-technical-reference-manual/reset-pinsThanks
Regards
Kian
Frequent ContributorHi,
Apologies for the delay in getting back and thanks for cross-checking the older HPS TRM.
From newer TRM document, asserting nPOR does not drive the nRST pin low on Cyclone V. nPOR requests a cold reset while the Reset Manager drives nRST low (via rst_pin_rst_n) only during a warm reset.
Current Cyclone V HPS TRM (683126 21.2) lists rst_pin_rst_n under Warm Reset only, and an Altera KDB documents that the old handbook wording about cold/POR driving HPS_nRST was incorrect.
You can refer to the sections below (took the screenshot above from here)
https://docs.altera.com/r/docs/683126/21.2/cyclone-v-hard-processor-system-technical-reference-manual/module-reset-signals
https://docs.altera.com/r/docs/683126/21.2/cyclone-v-hard-processor-system-technical-reference-manual/reset-pins
Thanks
Regards
Kian
