System Overview 1-15
The rules for addressing memory are as follows:
1.
A memory pair consists of 2 DIMMs of the same size.
2.
Memory pairs in riser cards may be of different sizes.
3.
The memory pair in slot 0 must be the largest of all memory pairs. Other
memory pairs may be as large but none may be larger.
4.
The physical starting address of each memory pair is N times 512MB (200
0000) where N is the slot number on the riser card.
5.
Memory addresses are contiguous within each module pair.
6.
If memory pairs do not completely fill the 512MB space provided, memory
“holes” occur in the physical address space.
7.
Software creates contiguous virtual memory even though physical memory may
not be contiguous.
