[IBIS-Users] Re: [IBIS] query regarding ramp functions

Hi Arnab ,

      One way to get about this problem is to cross check the Tr, Tf for that
particular IO buffer.

      You can also increse the simulation time. Here 2.5ns is very less. Try
increasing it to about 10ns and check the results.

      If this does not work, try with the [Tr] and [Tf].

Thanks ,

Vivek

                                                                                                                                       
                      "Arnab Hazarika"
                      <arnab@qualcomm.c To: ibis@eda.org
                      om> cc: ibis-users@eda.org
                      Sent by: Subject: [IBIS] query regarding ramp functions
                      owner-ibis@eda.or
                      g
                                                                                                                                       
                                                                                                                                       
                      01/21/05 08:36 AM
                                                                                                                                       
                                                                                                                                       

Hi all ,
I have doubt regarding the ramp down and ramp up functions.

 While creating the .s2i i have set the simulation time to be 2.5ns.

 The pulse signal thereby generated by s2ibis in rdn.spi is
    PULSE(2.5 0 0 2.5e-11 2.5e-11 5e-09 1.01e-08)
    .TRAN 2.5e-11 2.5e-09
 However if i carry ahead with pulse and transient statement then for the other
ramp functions then in the final ibis file i get
    Ramp]
| variable typ min max
dV/dt_r 0.61/0.13n 8.892e-21/-0.58n 0.82/89.36p
 Now dT must be greater than 0 in a Ramp specification and thereby winibis flags
off an error.

 So I needed to know how i go about this problem.

 Looking forward for your comments.
 Thanking you.

warm regards
arnab hazarika

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Received on Fri Jan 21 00:14:14 2005