Visible to Intel only — GUID: hco1416491051181
Ixiasoft
Visible to Intel only — GUID: hco1416491051181
Ixiasoft
2.3.2. Terminations for Multi-Rank DDR3 SDRAM Unbuffered DIMM
The following table lists the different permutations of a two‑slot DDR3 SDRAM interface and the recommended ODT settings on both the memory and controller when writing to memory.
Slot 1 |
Slot 2 |
Write To |
Controller OCT (3) |
Slot 1 |
Slot 2 |
||
---|---|---|---|---|---|---|---|
Rank 1 |
Rank 2 |
Rank 1 |
Rank 2 |
||||
DR |
DR |
Slot 1 |
Series 50-ohm |
120-ohm (4) |
ODT off |
ODT off |
40-ohm (4) |
Slot 2 |
Series 50-ohm |
ODT off |
40-ohm (4) |
120-ohm (4) |
ODT off |
||
SR |
SR |
Slot 1 |
Series 50-ohm |
120-ohm (4) |
Unpopulated |
40-ohm (4) |
Unpopulated |
Slot 2 |
Series 50-ohm |
40-ohm (4) |
Unpopulated |
120-ohm (4) |
Unpopulated |
||
DR |
Empty |
Slot 1 |
Series 50-ohm |
120-ohm (4) |
ODT off |
Unpopulated |
Unpopulated |
Empty |
DR |
Slot 2 |
Series 50-ohm |
Unpopulated |
Unpopulated |
120-ohm (4) |
ODT off |
SR |
Empty |
Slot 1 |
Series 50-ohm |
120-ohm (4) |
Unpopulated |
Unpopulated |
Unpopulated |
Empty |
SR |
Slot 2 |
Series 50-ohm |
Unpopulated |
Unpopulated |
120-ohm (4) |
Unpopulated |
Notes to Table:
|
The following table lists the different permutations of a two‑slot DDR3 SDRAM interface and the recommended ODT settings on both the memory and controller when reading from memory.
Slot 1 |
Slot 2 |
Read From |
Controller OCT (3) |
Slot 1 |
Slot 2 |
||
---|---|---|---|---|---|---|---|
Rank 1 |
Rank 2 |
Rank 1 |
Rank 2 |
||||
DR |
DR |
Slot 1 |
Parallel 50-ohm |
ODT off |
ODT off |
ODT off |
40-ohm (4) |
Slot 2 |
Parallel 50-ohm |
ODT off |
40-ohm (4) |
ODT off |
ODT off |
||
SR |
SR |
Slot 1 |
Parallel 50-ohm |
ODT off |
Unpopulated |
40-ohm (4) |
Unpopulated |
Slot 2 |
Parallel 50-ohm |
40-ohm (4) |
Unpopulated |
ODT off |
Unpopulated |
||
DR |
Empty |
Slot 1 |
Parallel 50-ohm |
ODT off |
ODT off |
Unpopulated |
Unpopulated |
Empty |
DR |
Slot 2 |
Parallel 50-ohm |
Unpopulated |
Unpopulated |
ODT off |
ODT off |
SR |
Empty |
Slot 1 |
Parallel 50-ohm |
ODT off |
Unpopulated |
Unpopulated |
Unpopulated |
Empty |
SR |
Slot 2 |
Parallel 50-ohm |
Unpopulated |
Unpopulated |
ODT off |
Unpopulated |
Notes to Table:
|