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BEFORE defines the relationship between data arrival and the next clock edge. For example, OFFSET IN BEFORE indicates that data will be valid at the input pin of a Xilinx device at a specified time before the next clockedge arrives at the Xilinx device.
AFTER defines the relationship between data arrival and the current clock edge. For example, OFFSET IN AFTER indicates that data will be valid at the input of a Xilinx device at a specified amount of time AFTER the current clock edge on the upstream device.
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