The pattern checker module provides simple verification that data is being received correctly. The pattern checker module uses the same parameters as the pattern generator module to quickly verify that it is receiving the same frame contents and frame size increments as those being generated. When enabled, the output from the AXI Ethernet streaming interface is monitored. The value in the type/length field is captured to identify the data location within the frame sequence. If an error is detected, an error condition is raised on the mismatched byte or bytes. The error condition is latched to a dedicated output and displayed using a board LED. The error condition can be cleared using a DIP switch.
The pattern checker module also provides a simple activity monitor which toggles a dedicated output to flash a board LED indicating that RX Data is being received correctly. This ensures that the lack of a detected error is not the result of all frames being dropped.