DCIUpdateMode Configuration Option - DCIUpdateMode Configuration Option - UG861

DCIUpdateMode is a configuration option that can override control of how often the DCI circuit updates the impedance matching to the VRP reference resistor in HP I/O banks. This option defaults to ASREQUIRED in the AMD implementation tools. The settings for the DCIUpdateMode configuration option are:

ASREQUIRED

Initial impedance calibration is made at device initialization, and dynamic impedance adjustments are made as needed throughout device operation (default).

QUIET

Impedance calibration is done once at device initialization, or each time the RST pin is asserted on the DCIRESET primitive for designs that include this primitive.