Interlaken defines an 8-bit field in each Control Word as "Multiple-Use" bits. These bits are transmitted with every Control Word that is sent and can be used to transmit any information. For example, one of the bits can be used to represent a link-level flow control status.
The Interlaken 600G IP core provides a
mechanism to set these bits to any desired value. All signals are synchronous with the
rising edge of clk and a detailed description of each signal
follows.