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Altera_Forum
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15 years ago

nSTATUS and CONF_DONE in user-mode

Can I toggle nSTATUS and/or CONF_DONE configuration signals after PS-configuration in user-mode?
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Thank You!

For CycloneIII on pg. 595 of “config_handbook.pdf” (Table 9–22):

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Driving nSTATUS low after configuration and initialization does not affect the configured device. …device ignores transitions on nSTATUS in user mode…

After all configuration data is received without error and the initialization cycle starts, the target device releases CONF_DONE. Driving CONF_DONE low after configuration and initialization does not affect the configured device.

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But for nCE: “However, all user IO pins will be held in tri-state whilst nCE is pulled high during user mode.” (Solution ID: rd01102011_672)