Achronix Speedster22i Interlaken - Manual (Page 47)

Link Level Flow Control
The Interlaken Protocol does not restrict the use of the calendar entries to a particular flow
control implementation. As such, the user can decide if one or more of the calendar entries
should be designated to control the flow control of the whole interface (i.e. link level flow
control). For example, if the calendar length is 32, the user can decide to use calendar slots 0 and
16 as link level flow control bits. This would result in transmitting the link level information with
every burst control word.
The IIPC implements the in-band flow control mechanism as described in the Interlaken Protocol
Definition. The IIPC is configured to have a fixed calendar length, and the TX and RX interfaces
are described in the
Transmitter Flow-Control Inputs
and
Receiver Flow-Control Outputs
Bits
sections.
User’s task: Connect the link level flow control information to the appropriate input pins of the
RX interface, and interpret the appropriate output pins of the TX interface.
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