There is full flexibility to implement any mechanism to handle system-wide flow control. The Integrated Interlaken IP core Transmitter inputs the supplied calendar information and packs it into the Interlaken Control words and transmits it over the link.
This mechanism allows you to take the system wide parameters into account and optimize the buffering by implementing the most optimum flow control mechanism.
The operation is as described in the Interlaken Protocol
Definition, Revision 1.2, October 7, 2008. The first
calendar entry, CTL_TX_FC_STAT[0], is sent in Bit[55] of a Control Word
with the Reset Calendar bit, Bit[56], set to a value of 1. The next calendar entry,
CTL_TX_FC_STAT[1], is sent in Bit[54] of the same Control Word and
so on to Bit[40]. The 17th calendar entry, CTL_TX_FC_STAT[16], is sent
in Bit[55] of the next Control Word that has the Reset Calendar bit, Bit[56], set to a
value of 0, and so forth.