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Hardware is instantiated by the TimeToolKcu1500

type AxiStreamMasterType is record

tValid : sl;                                           data is ready to be clocked in or out (equivalent of write enable)
tData : slv(127 downto 0);                  the actual data that the FIFO transmits
tStrb : slv(15 downto 0);                    
tKeep : slv(15 downto 0);                   which bytes from the tData to keep
tLast : sl;                                            identifies the last tData of the frame.

Everything in the following lines are axi extensions called (slac streaming interface) ssi
tDest : slv(7 downto 0);                      identifies the destination for when using multiple axis on a single bus
tId : slv(7 downto 0);                          transaction id for handshaking (validation the signal was )
tUser : slv(127 downto 0);                 user bits. can be used for anything. have been used for start of frame (SOF) and end of frame errors (EOFE), 
end record AxiStreamMasterType;    

To do:

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