A traditional IBIS model is an electrical description of buffer driving and receiving characteristics, not including any DSP behavior like that present in PCI Express Gen.3 onwards or DDR5.
AMI models include this behavior, so you can adjust parameters to optimize I/O channels for maximum performance.
As with other kinds of simulation, AMI models become even more valuable when you push density and speed envelopes and ultra-high-speed Serializer/Deserializer (SerDes) circuits are closely packed with other parts of your designs.
TOP BENEFITS. WHY DO YOU NEED AMI SIMULATION?
- AMI models are needed to simulate advanced transceivers like those in DDR5 and PCI Express (PCIe) Generation 3 and beyond. These transceivers use Digital Signal Processing (DSP) techniques to condition signals for ultra-high bitrates. Standard IBIS models cannot simulate the DSP behavior.
- High-speed serialized data goes so fast that waveform simulation alone is not enough. Higher-level verification with long stimulus patterns is essential to find key channel performance parameters Like Bit Error Rate (BER). A clean waveform at the receiver is no guarantee of working hardware.
- Since AMI models include DSP behavior, you can adjust parameters to optimize I/O channels for maximum performance. This increases the margin for unexpected post-production issues like poor operating environments and external electrical noise.