Adding and Configuring Components

Upgrades and Add-ons
Overview: Memory
On SuperDome systems, each cell board holds a portion of the total system memory. Part of the memory
address identifies the cell so that packets, which reference memory, can be routed to the correct cell
board. Once the packet reaches the appropriate cell, the memory address is converted into the proper
memory physical address, i.e., rank, bank, column, and row. The physical address is used to address the
memory Dual In-Line Memory modules (DIMMs) on the cell board. If the memory address refers to an
I/O subsystem address, the packet is forwarded to the I/O subsystem.
Cell Memory System
The cell memory system consists of the Memory Unit (MU) block of the cell controller (CC) Application
Specific Integrated Circuit (ASIC), the memory multiplexer/demultiplexer (M2) ASIC, the memory
DIMMs, and the supported hardware / busses on the cell board. The cell memory system has two
independent data paths, as shown in Figure 1, Cell Memory System.
Figure 1 Cell Memory System
Overview: Memory
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