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Altera_Forum
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12 years ago

JTAG Configuration - conf_done pin always low, even pull-up

After Board power-on, the conf_done pin which is also 10k pulled-up to 3.2V, but the pin is stick to low. the pull-up is not working for this pin. No short to GND. After power-on device, 16...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

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M0,1,2,3 = 0000 means passive serial configuration. Is that what you want? By "exposed pad" I mean a large copper area on the bottom of the physical IC package. If your part has an E144 package it has an exposed pad which MUST be connected to ground. Failure to do so will result in strange configuration errors.

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The config_done will go high when all devices are configred successfully in the JTAG chain.