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CHAPTER 6 Partition Settings and Notes
When an extended interleave mode is used, speed of the memory access for a
continuous area of the memory space is increased. When more than one system board
is mounted, these functions are implemented by adopting an address allocation
method in which logical memory addresses are mapped to the physical memory so
that the logical addresses continuously increase or decrease along the row of the
system boards. Such implementation reduces the chances of the conflicts on the
memory devices and those on the memory bus, increasing the memory throughput.
Figure 6.4 Interleave mode
(2)
Hardware conditions
The hardware conditions for which an interleave mode can be set are provided as
follows:
a) Normal interleave mode
l
Memory modules need to be mounted on the target system board in units of
memory groups, each of which consists of eight memory modules.
l
Each of the memory groups needs to consist of eight memory modules having the
same capacity.
b) Extended interleave mode
• Extended 1-SB interleave mode
l
Physical partitioning (PPAR) configuration must be used.
l
Memory modules must be fully mounted on an applicable system board.
l
All the memory modules that are mounted on an applicable system board must
have the same capacity.
• Extended 2-SB interleave mode
l
Physical partitioning (PPAR) configuration must be used.
