Datasheet
System Address Map
4-10 Intel
®
E8870 Scalable Node Controller (SNC) Datasheet
4.1.5.3.5 128-byte Interleave Example
Figure 4-4 describes the 128-byte interleaving of 16 GB of memory in a single-domain system with
various amounts of memory and different technologies on each node. The SPS MIRs define global
interleave ranges. An address range and the nodes assigned to each of the four ways is associated
with each SPS MIR. SNC MIRs define local interleaves. Each SNC MIR defines an address range
and specifies a range of memory of a given technology, size and the ways it owns.
Cases that illustrate particular MIR limitations or flexibility are in bold.
Global interleave range 0 extends from 0 to 8 GB. It consists of four 2-GB blocks interleaved
across SNC0, 1, 2, 3.
• Way 00 belongs to SNC0. The remaining memory on SNC0 is all Technology A, but must
be split into many local interleaves since it is included in other global interleaves. These
other global interleaves assign SNC0 different ways.
• Ways 01 and 10 belong to SNC1 and SNC2.
• Way 11 belongs to SNC3. Three different local interleaves (different technologies) on
SNC3 are included in global interleave 0.
Global interleave range 1 extends from 8 to 10 GB. It consists of four 500-MB blocks interleaved
across SNC0, 1, 2, 3. SNC3 has run out of memory, so the remainder of memory cannot be
interleaved four ways.
Figure 4-4. Use of MIRs to Interleave Blocks of Varying Size Across Different Nodes
001147
MIR[3]
2 GB, Tech A
00, 10
MIR[2]
1 GB, Tech A
00, 10
MIR[1]
500 GB, Tech A
00
MIR[0]
2 GB, Tech A
00
MIR[5]
2 GB
0, 3, 0, 3
MIR[4]
1 GB
0, 3, 0, 3
MIR[3]
1 GB
0, 1, 0, 1
MIR[2]
2 GB
0, 1, 0, 1
MIR[1]
2 GB
0, 1, 3, 5
MIR[0]
8 GB
0, 1, 3, 5
MIR[3]
1 GB, Tech C
01, 11
MIR[3]
500 MB, Tech B
01, 11
MIR[2]
1 GB, Tech B
01, 11
MIR[1]
500 MB, Tech B
01
MIR[0]
2 GB, Tech B
01
MIR[1]
500 MB, Tech D
10
MIR[3]
500 MB, Tech G
11
MIR[0]
2 GB, Tech C
10
MIR[2]
500 MB, Tech H
11
MIR[1]
500 MB, Tech G
11
MIR[0]
1 GB, Tech F
11
MIR[2]
500 MB, Tech E
01, 11
16 GB
14 GB
13 GB
12 GB
10 GB
8 GB
0
SPS
All Ports
SNC 0
5.5 GB
SNC 1
4 GB
SNC 2
4 GB
SNC 3
2.5 GB