Scan chain Reordering

• The scan Flip flop placements may create lengthier routes if the consecutive flops in scan chain placement far due to a functional requirement
• In this case, the Place and Route tool can reconnect the scan chain to make routing easier
• The scan chain reordering is performed at Placement 
• scan chain can reduce the wire length and congestion
• scan chain will improve  the routability
• scan chain can performed based on their physical location of the flops

Benefits with the Scan chain reordering:

• Lesser the length will reduce the resistance and capacitance
• Lower values of  R and C will improve the timing
• It will reduce the congestion