The high level protocol is described by the PCOL state machine It is responsible for interpreting the bytes received and scheduling data to read or written.The following states are used by the PCOL state machine
17 idle 18 read_addr 19 read_command 20 read_param_0 21 read_param_1 22 read_param_2 23 read_data 24 write_data 25 ignore_traffic The LINK state machine drives the low level protocol that sits under this high level protocol.