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JohnMoore's avatar
JohnMoore
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4 years ago

Agilex IBIS Model

All 1.2V drivers in the Agilex IBIS model with slew rates of S0 or S1 show serious stair stepping. This can be seen simply by viewing the Rising/Falling Waveforms with an IBIS viewer or in a simple s...
JohnMoore's avatar
JohnMoore
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4 years ago

I have an update - I am hearing from Intel that there will be an updated IBIS model that includes compensation for the S1 (medium) slew rate drivers. This compensation controls how long the step lasts essentially changing the effective slew rate. It appears this could shorten the rise time of the S1 slew rate to around 200ps which is, based on my simulations, optimal for address/control signals running at 1.6GHz. This is very good news! I assume the EMIF tool will also be updated to allow selection of a compensation value (I need to check to see if it's already there but just not in the IBIS model, which would be strange). In the end the eyes at each DRAM should look pretty darn good, which is a huge relief. Watch the website for the updated IBIS model (no ETA).