All, I will attend next Tuesday's meeting and will be prepared to discuss the following. I will also be prepared to make a presentation to the IBIS Summit on any of the following that you do not agree with: 1. LTI vs Non-LTI Modeling a. I will propose that we table any IBIS-ATM discussion until someone can present to IBIS a Channel that: i. Channel 1. A real IC Vendor SerDes Tx and Rx buffer 2. A real Tx and Rx Package 3. A real interconnect ii. When analyzing the Channel using 1. Non-LTI Vendor Models 2. An LTI approximation of the Models iii. Give results that are different enough to cause the design engineer to make substantively different design decisions. 2. Can anyone provide an IBIS SerDes Tx and Rx Buffer that has a constant impedance over the operating range of the Buffer that cannot be accurately represented by either the proposed AMI_Thevenin_Tx and AMI_Thevenin_Rx model? Please note the following subtle limitation of BIRD 116 described in 3. 3. [External Model]/Language ISS assumes that the Analog Model LTI. Therefore any Non-LTI affects that are caused by time variation that is captured in the IBIS Rising and Falling Waveforms. The only way to handle this is to change the D_to_A to contain a PWL. 4. Can anyone provide an ISS subckt that represents a Tx or Rx ISS SerDes buffer model that cannot be converted to an accurate Touchstone file? 5. Can anyone point to an industry standard SerDes specification (e.g. PCIeG3, PCIeG4, IEEE 802.3 bj, ap, kr) that does not specify constrains on the analog behavior that cannot be represented by the proposed AMI_Thevenin_Tx and AMI_Thevenin_Rx model? 6. Does anyone disagree that any Tx or Rx analog LTI model can be represented by one of the proposed models ( AMI_Tstonefile_Tx, AMI_Tstonefile_Rx, AMI_Thevenin_Tx, or AMI_Thevenin_Rx model? Walter Walter Katz <mailto:wkatz@xxxxxxxxxx> wkatz@xxxxxxxxxx Phone 303.449-2308 Mobile 720.333-1107