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Altera_Forum
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14 years ago

Hyperlynx IBIS : What is cmos25_io_r50

Hi everyone, I'm currently performing Hyperlynx simulations of an Arria II Gx FPGA design. I generated my ibis model with Quartus 11.0sp1 So far, everything works pretty good however I have so...
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Altera_Forum
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11 years ago

Hi,

You could find the naming nomenclature of the Arria II GX IBIS model in the Notes section of the .ibs file. Specific to the r50 and d4, you can refer to the following text extracted from the .ibs file:

d12 - 12mA Current Strength

r25 - 25 Ohm series on-chip Termination without Calibration

r50c - 50 Ohm series on-chip Termination with Calibration

r50 (without the 'c') mean 50 Ohm series on-chip Termination without Calibration