Bedrock Asic; Interface Board; Pci Riser Card - Silicon Graphics Origin 350 User Manual

4: Memory and PCI Expansion (MPX) Module

Bedrock ASIC

Interface Board

PCI Riser Card

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The Bedrock ASIC enables communication among the memory, network, and I/O
devices. It controls all activity within the node board; for example, error correction and
cache coherency. The Bedrock ASIC also supports page migration.
The Bedrock ASIC consists of the following:]
• A central crossbar (XB) provides connectivity between the Bedrock ASIC interfaces.
• A memory/directory interface (MD) controls all memory access.
• A network interface (NI) is the interface between the crossbar unit and the
NUMAlink 3 interconnect.
• An I/O interface (II) allows I/O devices to read and write memory (direct memory
access [DMA] operations).
The interface board contains the following components:
• L1 controller logic.
• Power supply interface.
• NUMAlink connector.
• XIO connector.
• Switching regulators.
• Connectors to the IP53 node board and the PCI riser card.
The PCI riser card provides the following:
• PIC ASIC.
• Connectors that connect the PCI riser card to the interface board.
• Four PCI/PCI-X card slots (64 bit, 3.3 V) and a slot for a VPro V12 graphics board.
(The slot for the VPro V12 graphics board is located on the backside of the PCI riser
card.)
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