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Hi, the DDR2+ SRAM parts are supposed to have ODT on the DATA lines... but I don't see it in the ibis model. I see it on the BWS and K/K* though.
Example from ddr2pb2l25_cy21xx.ibs (You can see where it says what the driving output impedance is, but the input impedance is unknown):
[Model Selector] DATAIO
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DATAIO50_TT_1.5 DATAIO models (50ohms) at TT conditions - 1.5V I/O
DATAIO50_FF_1.5 DATAIO models (50ohms) at FF conditions - 1.5V I/O
DATAIO50_TSF_1.5 DATAIO models (50ohms) at Typ Slow Fast conditions- 1.5V I/O
DATAIO30_TT_1.5 DATAIO models (30ohms) at TT conditions - 1.5V I/O
DATAIO30_FF_1.5 DATAIO models (30ohms) at FF conditions - 1.5V I/O
DATAIO30_TSF_1.5 DATAIO models (30ohms) at Typ Slow Fast conditions- 1.5V I/O
DATAIO40_TT_1.5 DATAIO models (40ohms) at TT conditions - 1.5V I/O
DATAIO40_FF_1.5 DATAIO models (40ohms) at FF conditions - 1.5V I/O
DATAIO40_TSF_1.5 DATAIO models (40ohms) at Typ Slow Fast conditions- 1.5V I/O
DATAIO60_TT_1.5 DATAIO models (60ohms) at TT conditions - 1.5V I/O
DATAIO60_FF_1.5 DATAIO models (60ohms) at FF conditions - 1.5V I/O
DATAIO60_TSF_1.5 DATAIO models (60ohms) at Typ Slow Fast conditions- 1.5V I/O
DATAIO70_TT_1.5 DATAIO models (70ohms) at TT conditions - 1.5V I/O
DATAIO70_FF_1.5 DATAIO models (70ohms) at FF conditions - 1.5V I/O
Thank you.
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Hi Westec,
The data inputs also have ODT.Please confirm whether you are referring to the latest IBIS model on the web in link below:
http://www.cypress.com/?rID=48344
Below are the ODT buffer model in the IBIS model.
[Model Selector] INPAD
INPUT525_TT_1.5 INPUT models(52.5ohms) at TT conditions - 1.5V I/O
INPUT525_FF_1.5 INPUT models(52.5ohms) at FF conditions - 1.5V I/O
INPUT525_TSF_1.5 INPUT models(52.5ohms) at TypSlowFast conditions- 1.5V I/O
INPUT75_TT_1.5 INPUT models (75ohms) at TT conditions - 1.5V I/O
INPUT75_FF_1.5 INPUT models (75ohms) at FF conditions - 1.5V I/O
INPUT75_TSF_1.5 INPUT models (75ohms) at TypSlowFast conditions- 1.5V I/O
INPUT90_TT_1.5 INPUT models (90ohms) at TT conditions - 1.5V I/O
INPUT90_FF_1.5 INPUT models (90ohms) at FF conditions - 1.5V I/O
INPUT90_TSF_1.5 INPUT models (90ohms) at TypSlowFast conditions- 1.5V I/O
INPUT105_TT_1.5 INPUT models (105ohms) at TT conditions - 1.5V I/O
INPUT105_FF_1.5 INPUT models (105ohms) at FF conditions - 1.5V I/O
INPUT105_TSF_1.5 INPUT models (105ohms) at TypSlowFast conditions- 1.5V I/O
INPUT150_TT_1.5 INPUT models (150ohms) at TT conditions - 1.5V I/O
INPUT150_FF_1.5 INPUT models (150ohms) at FF conditions - 1.5V I/O
INPUT150_TSF_1.5 INPUT models (150ohms) at TypSlowFast conditions- 1.5V I/O
INPUT525_TT_1.8 INPUT models(52.5ohms) at TT conditions - 1.8V I/O
INPUT525_FF_1.8 INPUT models(52.5ohms) at FF conditions - 1.8V I/O
INPUT525_TSF_1.8 INPUT models(52.5ohms) at TypSlowFast conditions- 1.8V I/O
INPUT75_TT_1.8 INPUT models (75ohms) at TT conditions - 1.8V I/O
INPUT75_FF_1.8 INPUT models (75ohms) at FF conditions - 1.8V I/O
INPUT75_TSF_1.8 INPUT models (75ohms) at TypSlowFast conditions- 1.8V I/O
INPUT90_TT_1.8 INPUT models (90ohms) at TT conditions - 1.8V I/O
INPUT90_FF_1.8 INPUT models (90ohms) at FF conditions - 1.8V I/O
INPUT90_TSF_1.8 INPUT models (90ohms) at TypSlowFast conditions- 1.8V I/O
INPUT105_TT_1.8 INPUT models (105ohms) at TT conditions - 1.8V I/O
INPUT105_FF_1.8 INPUT models (105ohms) at FF conditions - 1.8V I/O
INPUT105_TSF_1.8 INPUT models (105ohms) at TypSlowFast conditions- 1.8V I/O
INPUT150_TT_1.8 INPUT models (150ohms) at TT conditions - 1.8V I/O
INPUT150_FF_1.8 INPUT models (150ohms) at FF conditions - 1.8V I/O
INPUT150_TSF_1.8 INPUT models (150ohms) at TypSlowFast conditions- 1.8V I/O
regards
Jayasree
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Hi Jayasree,
Yes that's a good example model (I've looked at several CIO models... all very similar.)
The INPAD does have ODT, but is not assigned to Data. Data use the DATAIO model (the one I pasted.) Check the [Pin] list:
B2 DQ27 DATAIO
Thanks again,
Joseph