10IBM Power Systems 775 for AIX and Linux HPC Solution
1.4.2 I/O hub chip
This section provides information about the IBM Power 775 I/O hub chip (or torrent chip), as
shown in Figure 1-4.
Figure 1-4 Hub chip (Torrent)
Host fabric interface
The host fabric interface (HFI) provides a non-coherent interface between a quad-chip
module (QCM), which is composed of four POWER7, and the clustered network.
Figure 1-5 on page 11 shows two instances of HFI in a hub chip. The HFI chips also attach to
the Collective Acceleration Unit (CAU).
Each HFI has one PowerBus command and four PowerBus data interfaces, which feature the
following configuration:
1.The P ...
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