All, I have made the changes requested by Bob and Arpad (enclosed). Any additional comments before I send the formal version to Michael this afternoon would be appreciated. Walter From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Muranyi, Arpad Sent: Friday, May 24, 2013 10:03 AM To: IBIS-ATM Subject: [ibis-macro] Re: BIRD 158.3 Walter, Here are my comments on this BIRD draft. What does "differential transmission" mean in this sentence: "This Impulse Response characterizes the differential transmission of the Tx analog buffer model,"? Could you make this clearer with better wording? In the following sentence you are talking about the "die side of the package": "For a Tx buffer, the Transmitter Circuit defines the analog buffer model between the zero impedance stimulus input voltage source and the die side of the package model. For an Rx buffer, the Receiver Circuit defines the analog buffer model between the die side of the package model and a high impedance probe at the input to the Rx Algorithmic model." However, it is not clear whether this means that the buffer model described by the data in the Touchstone file can/should also include the on-die interconnect or not. I think this should be clearly stated otherwise different people will make different assumptions to model on-die interconnects. This sentence: "Note that this Touchstone analog model only represent the on-die model between the die pad and buffer interface to the algorithmic model" is somewhat misleading, because it can be interpreted as if the Touchstone model is **the** on-die interconnect model between the pad and the buffer's terminals ("buffer interface"). You use the words "unit excitation". This sentence: "This BIRD defines what that unit excitation is when the Tsonefile parameter is present." really doesn't make sense, because by definition a unit = 1, i.e. the "unit excitation" would have to have a fixed and predefined magnitude of 1 volt, yet in this BIRD you define Tx_Voh and Tx_Vol, which is not "unit" anymore. Also, please correct the spelling of "Tsonefile" in this sentence (missing "t"). You mention in the discussion of the Impulse Response generation that the Tstonefile parameter is a Reserved Parameter, but you don't say anywhere in the document whether the rest of the parameters in this BIRD are Reserved or Model_Specific. Please specify what you want them to be. I would also like to request to put a "0" before and after each decimal point for properness. For example, instead of "(Range 1. .5 1.)" please write "(Range 1.0 0.5 1.0)", it is much more readable that way. Thanks, Arpad ====================================================================== From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Walter Katz Sent: Thursday, May 23, 2013 9:04 PM To: IBIS-ATM Subject: [ibis-macro] BIRD 158.3 All, Please review version 158.3 (Tstonefile AMI models) before I send the final version to Michael tomorrow afternoon. The major change is that there are now two Tx voltage levels (Tx_Vol and Tx_Voh) that determine the differential step response stimulus that is assumed for generating the Impulse Response of the channel. This make BIRD158 Tstonefile models directly convertible to BIRD 160 external models, and gives the model maker the ability to determine the common mode voltage when generating the Impulse Response of a channel. Walter Walter Katz wkatz@xxxxxxxxxx Phone 303.449-2308 Mobile 303.335-6156
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