1.6.4. Add External Resistors to Pull the Outputs to a Defined Logic Level
The output pins tri-state during programming or configuration. Additionally, on MAX® 7000, FLEX® 10K, APEX™ 20K, and all configuration devices, the pins are pulled up by a weak internal resistor—for example, 50 kΩ.
However, not all Altera devices have weak pull-up resistors during ISP or in-circuit reconfiguration. For information about which device has weak pull-up resistors, refer to the data sheet of the relevant device family.
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