Link-Level Flow Control and Buffering - Microarchitecture of Network-on-Chip Routers - page 30

Fig. 2.18 An example of
data transfer using
credit-based flow control
when the number of available
credits is varied relative to the
round-trip time (sum of
forward and backward update
latency)

credits
counter

update

update

ready

valid

A data B C

receiver

sender

By changing the available credits relative to the round-trip delay of L f C L b ,the
designer can adapt dynamically the rate of communication of each link. This feature
can be easily applied for allowing dynamic power adaptivity both on the NoC links