9-input 8-output mux, and it transfers data in the reverse di-
rection. The PCX and CPX combined provide a Read/Write
bandwidth of
270 GB/s. All crossbar data transfer requests
are processed using a four-stage pipeline. The pipeline stages
are: Request, Arbitration, Selection, and Transmission. As can
be seen from the
fi
gure, there are
possible
source destination pairs for each data transfer request. There is
a two-deep queue for each source
–
destination pair to hold data
transfer requests for that pair.