Interlaken defines an eight-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 Integrated Interlaken IP core provides a mechanism to set these bits to any
desired value. All signals are synchronous with the rising-edge of
LBUS_CLK and a detailed description of each signal follows.