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 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 interface, 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
clk.