Due to a problem in the Quartus® II software version 13.1 and earlier, you may see the following Design Assistant critical warnings when you use the altlvds_rx IP.

Description

Due to a problem in the Quartus® II software version 13.1 and earlier, you may see the following Design Assistant critical warnings when you use the altlvds_rx IP:

Critical Warning (308024): (High) Rule R101: Combinational logic used as a reset signal should be synchronized. Found 4 node(s) related to this rule.

Critical Warning (308012): Node "altlvds_rx:ALTLVDS_RX_component|test_lvds_rx:auto_generated|wire_dffe15_clrn~0"

Critical Warning (308012): Node "altlvds_rx:ALTLVDS_RX_component|test_lvds_rx:auto_generated|wire_dffe36_clrn~0"

Resolution

This R101 violation critical warning can be safely ignored because the inputs to the combinational logic will not produce a hazardous glitch for the reset signal.