David; The motivation of using touchstone to represent Tx and Rx analog models is to capture the transmission/reflection broadband characteristics of the ICs. Regards, Fangyi From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of David Banas Sent: Tuesday, March 05, 2013 8:48 AM To: 'ibis-interconn@xxxxxxxxxxxxx'; 'ibis-macro@xxxxxxxxxxxxx' Subject: [ibis-macro] A question. Hi all, I was hoping that you might consider the following question and offer your comments at today's meeting. Is the difficulty one runs into, when one attempts to shorten the time span of IBIS V/T tables, in order to support the bit rates necessary in modern serial communication design, one of the primary motivators for including the a.c. behavior of the Tx driver in the Touchstone model of the on-die interconnect? Thanks, David Banas Sr. Member Technical Staff Altera<http://www.altera.com/> +1-408-544-7667 - desk Did you know Altera offers over 150 free online technical training courses<http://www.altera.com/servlets/searchcourse?coursetype=Online&WT.mc_id=t9_ot_mi_mi_tx_a_311>? Take one today! ________________________________ Confidentiality Notice. This message may contain information that is confidential or otherwise protected from disclosure. If you are not the intended recipient, you are hereby notified that any use, disclosure, dissemination, distribution, or copying of this message, or any attachments, is strictly prohibited. If you have received this message in error, please advise the sender by reply e-mail, and delete the message and any attachments. Thank you.