Resent Von: Havermann, Gert Gesendet: Dienstag, 25. Juni 2013 13:48 An: 'Siddharth Rajagopalan' Cc: si-list@xxxxxxxxxxxxx Betreff: AW: [SI-LIST] WG: Transmitter Jitter Setup for simulations of 5Gbps SERDES Hi Siddharth, you are correct, but where else to put it in when you only have bounded TX Jitter settings? This was the best compromise I could find. As I said, I know the results will not be precise, but that is usually not expected for simulations using generic Models. For accurate results you need to work with the AMI Models of the chosen Chipsets as they (should) include all the correct Jitter. BR Gert Von: Siddharth Rajagopalan [mailto:maxsidhu@xxxxxxxxx] Gesendet: Dienstag, 25. Juni 2013 13:43 An: Havermann, Gert Cc: si-list@xxxxxxxxxxxxx Betreff: Re: [SI-LIST] WG: Transmitter Jitter Setup for simulations of 5Gbps SERDES hi gert, how can you enter the Uncorrelated bounded high probability jitter(UBHPJ) in RJ?? RJ by definition is an unbounded jitter. correct me if i am wrong. Regards, Siddharth Rajagopalan Signal integrity engineer, Cisco systems Mobile: +91 725 9277122 direct: +91 8044266229 official email: sidrajag@xxxxxxxxx On Tue, Jun 25, 2013 at 4:31 PM, Havermann, Gert <Gert.Havermann@xxxxxxxxxxx> wrote: Resent Von: Havermann, Gert Gesendet: Dienstag, 25. Juni 2013 12:50 An: 'Hirshtal Itzhak'; si-list@xxxxxxxxxxxxx Betreff: AW: Transmitter Jitter Setup for simulations of 5Gbps SERDES Hi Itzhak, I think both isn't absolutely correct. The right in the definition of total Chip jitter is, it contains all Jitter aspects including ISI within the chip and package. You Channel will have additional ISI, but that's not part of the transmitter specification (or at least shouldn't be). As you know, I'm not using Hyperlynx. ADS asks for DCD, Clock DCD, PJ (in amplitude and frequency) and RJ. I usually take the DCD from the datasheet, and put the UBHPJ into RJ and then set PJ in a way that my transmit Eye shows the Total Jitter. This isn't 100% correct, but it worked well in the past. BR Gert Von: Hirshtal Itzhak [mailto:ihirshtal@xxxxxxxxxx] Gesendet: Dienstag, 25. Juni 2013 12:14 An: Havermann, Gert; si-list@xxxxxxxxxxxxx Betreff: RE: Transmitter Jitter Setup for simulations of 5Gbps SERDES Hi again, Let me try to focus on a certain aspect of my problem: The sRIO Level II spec details the Tx Jitter values as follows: Eye Mask = 125mV Uncorrelated Bounded High Probability Jitter = 0.15UI ptp Duty Cycle Distortion = 0.05UI ptp Total Jitter = 0.30UI ptp The question is: what do these parameters mean? My understanding: The Transmitter device maximum allowed DCD & jitter. What the device vendor seems to tell me: The maximum actual DCD & jitter present on the Transmitter pins due to both internal jitter generation and channel ISI. So my 1st question is - which is correct? Then, if the 1st interpretation is true, it seems I need to somehow enter all of the above detailed parameters to my simulation transmitter model, shouldn't I? On the other hand, if the 2nd interpretation is true, then it seems I have to ask the device vendor to tell me what's the actual jitter generated by the device itself, shouldn't I? Thanks for your help on this matter! Itzhak Hirshtal ---------------------------------------- Absender ist HARTING Electronics GmbH, Marienwerderstraße 3, D-32339 Espelkamp; Registergericht: Amtsgericht Bad Oeynhausen; Register-Nr.: HRB 8808; Vertretungsberechtige Geschäftsführer: Dipl.-Kfm. Edgar-Peter Düning, Dipl.-Ing. Torsten Ratzmann ---------------------------------------- Absender ist HARTING Electronics GmbH, Marienwerderstraße 3, D-32339 Espelkamp; Registergericht: Amtsgericht Bad Oeynhausen; Register-Nr.: HRB 8808; Vertretungsberechtige Geschäftsführer: Dipl.-Kfm. Edgar-Peter Düning, Dipl.-Ing. Torsten Ratzmann -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Havermann, Gert Sent: Wednesday, June 19, 2013 3:00 PM To: Hirshtal Itzhak; si-list@xxxxxxxxxxxxx Subject: [SI-LIST] AW: Transmitter Jitter Setup for simulations of 5Gbps SERDES Hi Itzhak, Quite honestly I don't know hyperlinx in that detail. You should ask the support or maybe some helpfiles to find out which type of Jitter has to be used. You could try to add one jitter component at a time and measure the jitter in the simulation result to check if the input Jitter equals the output Jitter. This way you can find out which parameter to change in which way. BR Gert ---------------------------------------- Absender ist HARTING Electronics GmbH, Marienwerderstraße 3, D-32339 Espelkamp; Registergericht: Amtsgericht Bad Oeynhausen; Register-Nr.: HRB 8808; Vertretungsberechtige Geschäftsführer: Dipl.-Kfm. Edgar-Peter Düning, Dipl.-Ing. Torsten Ratzmann -----Ursprüngliche Nachricht----- Von: Hirshtal Itzhak [mailto:ihirshtal@xxxxxxxxxx] Gesendet: Mittwoch, 19. Juni 2013 13:36 An: Havermann, Gert; si-list@xxxxxxxxxxxxx Betreff: RE: Transmitter Jitter Setup for simulations of 5Gbps SERDES Hi Gert, I did exactly that!! The question was: Am I correct in doing so? And what about the non-random jitter? Did I set it up correctly? Also, I've heard an opinion saying I shouldn't set these jitter values at all, but take instead the jitter specification of the Transmitter Reference Clock! Is that true? Regards Itzhak -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Havermann, Gert Sent: Wednesday, June 19, 2013 12:58 PM To: Hirshtal Itzhak; si-list@xxxxxxxxxxxxx Subject: [SI-LIST] AW: Transmitter Jitter Setup for simulations of 5Gbps SERDES The Jitter Values can be given in either "RMS" or "Peak to Peak". Check what kind of input the simulator engine needs, and if it agrees to the datasheet numbers you punched in. If simulator uses RMS and Datasheet gives P2P, then you need to convert the jitter values using a BER based conversion table. BR Gert ---------------------------------------- Absender ist HARTING Electronics GmbH, Marienwerderstraße 3, D-32339 Espelkamp; Registergericht: Amtsgericht Bad Oeynhausen; Register-Nr.: HRB 8808; Vertretungsberechtige Geschäftsführer: Dipl.-Kfm. Edgar-Peter Düning, Dipl.-Ing. Torsten Ratzmann -----Ursprüngliche Nachricht----- Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im Auftrag von Hirshtal Itzhak Gesendet: Mittwoch, 19. Juni 2013 11:57 An: si-list@xxxxxxxxxxxxx Betreff: [SI-LIST] Transmitter Jitter Setup for simulations of 5Gbps SERDES Hello all, I have a question relating to the proper use of jitter in hi-speed simulations of several Gbps pairs. I've been using HyperLynx IBIS-AMI Channel Analysis tool in order to simulate 5Gbps channels going from one PCB to another one through a motherboard. I use IBIS-AMI models from the Tx/Rx vendors and S-Parameter models for the connectors involved. The main problem for me is understanding how to use the jitter specification for the transmitter. The transmitter data sheet defines miscellaneous Near-End (Tx) Template Intervals, part of which are jitter intervals, which include T_UBHPJ (Uncorrelated Bounded High Probability Jitter) of 0.15UIptp, T_DCD (Duty-Cycle Distortion) of 0.05UIptp and T_TJ (Total Jitter) of 0.30UIptp. I have been using these parameters as follows inside the simulation tool setup: - Dual Dirac Jitter: 1st mean = -0.1UI, 2nd mean = +0.1UI (accounting approximately for the sum of the 1st 2 jitter parameters, which equals 0.2UI) - Sigma of Random Jitter = 0.01UI, which results from subtracting the1st 2 parameters from the total jitter (yielding 0.1UI) and dividing the result by 14 (the ratio [for BER of 10**(-12)] between peak-to-peak jitter and Sigma. I rounded the final result up a little to get 0.01UI. So, to conclude: Have I used the simulation tool's jitter setup correctly to account for the Tx jitter definitions? Because when I do that, I get a closed eye (relative to the Rx eye-mask spec). Without these jitter elements the eye is completely open! Also, what BER ratio should I use for the Sigma definition? Should it be according to the desired BER on the receiver? Thanks for your help Itzhak Hirshtal Elta The information contained in this communication is proprietary to Israel Aerospace Industries Ltd. and/or third parties, may contain confidential or privileged information, and is intended only for the use of the intended addresse thereof. If you are not the intended addressee, please be aware that any use, disclosure, distribution and/or copying of this communication is strictly prohibited. If you receive this communication in error, please notify the sender immediately and delete it from your computer. 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Thank you. ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu The information contained in this communication is proprietary to Israel Aerospace Industries Ltd. and/or third parties, may contain confidential or privileged information, and is intended only for the use of the intended addresse thereof. If you are not the intended addressee, please be aware that any use, disclosure, distribution and/or copying of this communication is strictly prohibited. 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Thank you. ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu