PRODUCT OVERVIEW
4-11
SL240 XMC User Guide
Copyright 2017
4.4.4 Single Master Ring
This is one of the most useful topologies for the SL240 XMC PCIe card. This topology allows a
single transmitter to send data to a group of destinations with flow control from all of the
destinations. This flow control is a single flag to the master—it can send or it cannot send data.
This means that if one destination has a failure and stops removing data from its receive FIFO, it
should be switched out to avoid bringing down the loop. A switch suitable for this purpose is the
LinkXchange GLX4000 Physical Layer Switch, available from Curtiss-Wright. Software controls
mastership switching of the ring. There are rules associated with master switching listed in the
“Programming Interface” section. The flow control used in this case is similar to a multi-drop
FPDP bus, where any receiver can back the transmitter off.
Figure 4-8 Single Master Ring
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