abstract link receiver, so I can use it for both data and flow control
put incoming data in data register (read only access from outside)
add ready bit, clearable by outside
use fifof for data out
added noc example
Copied from serialconfig
No content really, just fifos for messages each way
compiles
compiles
start to write rules for operation of switch
Merge branch 'master' of github.com:cambridgehackers/xbsv