Ip53 Node Board; Local Memory (Dimms) - Silicon Graphics Origin 350 User Manual

IP53 Node Board

Local Memory (DIMMs)

007-4566-001
The MPX module architecture includes the components discussed in the following
subsections
• "IP53 Node Board" on page 135
• "Interface Board" on page 138
• "PCI Riser Card" on page 138
• "Power Supplies" on page 139
The IP53 node board consists of the following components:
• Eight dual-inline memory module (DIMM) slots allow installation of DIMMs to
provide 1 to 8 GB of main memory to local memory bank pairs on your server
system. For more information, see the subsection that follows.
• The Bedrock ASIC (or hub ASIC) enables communication between memory and
I/O devices. For more information, see "Bedrock ASIC" on page 138.
• The serial ID EEPROM contains component information.
• Three VRMs convert incoming voltages to voltages required by components.
Each MPX module has from 1 to 8 GB of local memory, which includes main memory and
directory memory for cache coherence.
Local memory is provided by DIMMs, which contain double data rate synchronous
dynamic random-access memory (DDR SDRAM chips), installed in two or more DIMM
slots located on the MPX module.
These eight DIMM slots are laid out into one group of even-numbered slots 0, 2, 4, and
6, and a second group of odd-numbered slots 1, 3, 5, and 7, as shown in Figure 4-2.
DIMMs are installed one per DIMM slot, and two at a time, so that the two DIMMs
provide local memory for the same pair of banks (see Table 4-1). Conversely, DIMMs are
also removed two at a time, so that removing the two DIMMs removes local memory for
the same pair of banks.
System Features
135