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Ixiasoft
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Ixiasoft
3.2.1. Overview of ODT Control
With a dual-DIMM interface on the system, the controller has different options for turning the memory ODT on or off during read or write. The following table lists the DDR2 SDRAM ODT control during write to the memory. These DDR2 SDRAM ODT controls are recommended by Samsung Electronics. The JEDEC DDR2 specification was updated to include optional support for RTT(nominal) = 50-ohm.
For more information about the DDR2 SDRAM ODT controls recommended by Samsung, refer to the Samsung DDR2 Application Note: ODT (On Die Termination) Control.
Slot 1 (2) |
Slot 2 (2) |
Write To |
FPGA |
Module in Slot 1 |
Module in Slot 2 |
||
---|---|---|---|---|---|---|---|
Rank 1 |
Rank 2 |
Rank 3 |
Rank 4 |
||||
DR |
DR |
Slot 1 |
Series 50-ohms |
Infinite |
Infinite |
75 or 50-ohm |
Infinite |
Slot 2 |
Series 50-ohms |
75 or 50-ohm |
Infinite |
Infinite |
Infinite |
||
SR |
SR |
Slot 1 |
Series 50-ohms |
Infinite |
Unpopulated |
75 or 50-ohm |
Unpopulated |
Slot 2 |
Series 50-ohms |
75 or 50-ohm |
Unpopulated |
Infinite |
Unpopulated |
||
DR |
Empty |
Slot 1 |
Series 50-ohms |
150-ohm |
Infinite |
Unpopulated |
Unpopulated |
Empty |
DR |
Slot 2 |
Series 50-ohms |
Unpopulated |
Unpopulated |
150-ohm |
Infinite |
SR |
Empty |
Slot 1 |
Series 50-ohms |
150-ohm |
Unpopulated |
Unpopulated |
Unpopulated |
Empty |
SR |
Slot 2 |
Series 50-ohms |
Unpopulated |
Unpopulated |
150-ohm |
Unpopulated |
Notes to Table:
|
Slot 1 (2) |
Slot 2 (2) |
Read From |
FPGA |
Module in Slot 1 |
Module in Slot 2 |
||
---|---|---|---|---|---|---|---|
Rank 1 |
Rank 2 |
Rank 3 |
Rank 4 |
||||
DR |
DR |
Slot 1 |
Parallel 50-ohms |
Infinite |
Infinite |
75 or 50-ohm |
Infinite |
Slot 2 |
Parallel 50-ohms |
75 or 50-ohm |
Infinite |
Infinite |
Infinite |
||
SR |
SR |
Slot 1 |
Parallel 50-ohms |
Infinite |
Unpopulated |
75 or 50-ohm |
Unpopulated |
Slot 2 |
Parallel 50-ohms |
75 or 50-ohm |
Unpopulated |
Infinite |
Unpopulated |
||
DR |
Empty |
Slot 1 |
Parallel 50-ohms |
Infinite |
Infinite |
Unpopulated |
Unpopulated |
Empty |
DR |
Slot 2 |
Parallel 50-ohms |
Unpopulated |
Unpopulated |
Infinite |
Infinite |
SR |
Empty |
Slot 1 |
Parallel 50-ohms |
Infinite |
Unpopulated |
Unpopulated |
Unpopulated |
Empty |
SR |
Slot 2 |
Parallel 50-ohms |
Unpopulated |
Unpopulated |
Infinite |
Unpopulated |
Notes to Table:
|