Product Overview; Figure 5-1 Front View Of Px-Brick - Silicon Graphics Origin 3900 User Manual

5: PX-brick

Product Overview

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The 4U-high PX-brick shown in Figure 5-1 provides 12 card slots to support up to 12 PCI
or PCI-X cards. The 12 slots are configured as six 2-slot buses.
Compared to the P-brick, the PX-brick offers the following enhancements:
• The PX-brick supports both PCI cards and PCI-X cards.
• The PX-brick can connect an InfiniteReality graphics pipe to a Cx-brick.
Figure 5-1 Front View of PX-brick
Three PIC (PCI interface chip) ASICs are key components of the PX-brick architecture.
The PIC ASICs support the following (see Figure 5-2):
• Two 1200- or 800-MB/s Xtown2 XIO ports. (You can select the MB/s setting with
the L1 controller command XIO. For more information, see the SGI L1 and L2
Controller Software User's Guide.)
• Six PCI/PCI-X buses. Each bus has two card slots in which you can install PCI or
PCI-X cards.
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