By default in testbench tb_top.v, TEST_RECONFIG_SEQ is set to "half." The video pattern will be reconfigured in the sequence of 12GA-->6GB-->3GA-->HS-->SD.
This shows an excellent example of reconfiguration but gives too short a time to detail transmits video data pattern for mode.
Modify the TEST_RECONFIG_SEQ parameter to set different video patterns in the simulation.
For example, change it to "12GA" to run a simulation of a 12G video bitstream.
This parameter supports multiple options, "full", ''half', "12GA".. etc.
Refer to tb_tasks.v for detailed parameter values.