[IBIS] RE: [IBIS-Users] How to include Differential and Normal IO's of same pins

From: Tom Dagostino <tom_at_.....>
Date: Thu Apr 06 2006 - 09:12:16 PDT
When the model is used in the single ended mode with model selector just
comment out the diff pin entry.

Tom Dagostino
Teraspeed(R) Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
tom@teraspeed.com
www.teraspeed.com

Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827

  -----Original Message-----
  From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org]On Behalf
Of seshadri.kirankumar@wipro.com
  Sent: Thursday, April 06, 2006 6:10 AM
  To: ibis@eda.org; ibis-users@eda.org
  Subject: [IBIS-Users] How to include Differential and Normal IO's of same
pins


  Hi Experts,



            I have a doubt regarding IBIS model of incorporating
Differential and Non-differential Buffers in the same IBIS file



  As an Example there are 2 pins and corresponding LVDS definition is as
follows

  [Pin]     signal_name      model_name              R_pin        L_pin
C_pin

  |

  Pin1         CLKP             LVDS_1

  Pin2         CLKN             LVDS_2

  |

  [Diff_pin]       inv_pin         vdiff       tdelay_typ     tdelay_min
tdelay_max

  |

  Pin1             Pin2            200mV      NA              NA
NA



  For  the same 2 above pins there exist normal(Non differential) IO's too,
my doubt is that will it be possible to include both Differential and Normal
IO's with any IBIS mechanism like how a {Model Selector] chooses different
models for the same pin? If so please let me know on how?



      Suppose same if I do using [Model Selector] then what will be the
impact of [Diff_pin] section on this pins when I am using only Normal
models, this prototype is as listed below

  [Pin]     signal_name      model_name              R_pin        L_pin
C_pin

  |

  Pin1         CLKP             MODEL_1

  Pin2         CLKN             MODEL_2

  |

  [Diff_pin]       inv_pin         vdiff       tdelay_typ     tdelay_min
tdelay_max

  |

  Pin1             Pin2            200mV      NA              NA
NA

  |

  [Model Selector]     MODEL_1

  LVDS_1                     lvds model

  BUFFER_1                 normal output buffer

  |

  [Model Selector]     MODEL_2

  LVDS_2                     lvds model

  BUFFER_2                 normal output buffer

  |

  What my opinion is option 2 is not proper as there is still
valid(uncommented) [Diff_pin]  section exist for the same pins while using
normal IO's mode, please correct me if my concept is wrong



  Any Help on this is appreciable



  Thanks & Best Regards

  Kiran Kumar




















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Received on Thu Apr 6 09:12:14 2006

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