The Meta Frame Diagnostic words calculate a CRC32 over all the data within the Meta Frame in a lane to help diagnose errors. The Interlaken protocol provides for optional status messaging within these Diagnostic Words. This mechanism allows a Receiver to communicate, through the adjacent Transmitter or an out-of-band flow control interfaces, the health of each (received) lane and the overall health of the Receiver interface to the other device.
The results of received Diagnostic Words are described in the following subsections. All
signals are synchronous with the rising-edge of LBUS_CLK.