Subject: Re: [IBIS-Users] IBIS Model for SSTL differential output buffer
From: Lynne D. Green (lgreen22@mindspring.com)
Date: Mon Dec 29 2003 - 08:51:03 PST
Hello, Ranjan,
A newer version, s2ibis3, is available on the IBIS web site.
Best regards,
Lynne
Lynne Green
Green Streak Programs
On Mon, 2003-12-29 at 05:29, Ranjan Kumar Sahoo wrote:
> Hi all,
> I am trying to generate IBIS model for SSTL diiferential Output buffer.
> Input swing is 500 mv ( VDD-500mv to VDD) .Output swing is 0 to Vdd.
> s2ibis2 is used for IBIS file generation. The problem is output never
> falls below
> Vdd value in case of Falling wave form and always close to Vdd in case
> of rising wave form
> But when I do an Antrim Simulation (with R_fixture=50ohm connected to
> Vdd) the swing is
> proper.
> In case of differntial output buffer how the input stimulus is applied
> and how R_fixture is connected. The relevent input information and pin
> details
> are given below.
>
> Thanks & regards,
> Ranjan
>
>
>
> [temperature range] 27 140 0
> [voltage range] 1.8 1.7 1.9
> [sim time] 9ns
> [vil] 1.3 1.2 1.4
> [vih] 1.8 1.7 1.9
> [Tr] 1ns 0.9ns 1.10ns
> [Tf] 1ns 0.9ns 1.10ns
> [C_comp] 2pf 1.8pf 2.2pf
> [rload] 50
>
>
> [Pin]
> 1 d_core_p d_core_p dummy_in
> 2 d_core_n d_core_n dummy_in
> 3 pad1 pad1 diff_output
> -> 1
> 4 pad2 pad2 diff_output
> -> 2
> 5 vgnd vgnd GND
> 6 vpwr vpwr POWER
>
>
>
> Non-inv_pin inv_pin vdiff tdelay_typ tdelay_min tdelay_max
>
> 1 2 250mv 0ns NA NA
>
>
> |Differential output pin is indicated by keyword Diff Pin
> |
>
> [Diff Pin]
> |Non-inv_pin inv_pin vdiff tdelay_typ tdelay_min tdelay_max
>
> 3 4 0v 0ns NA NA
>
> [Model] diff_output
> [Model type]Output
> [Polarity] Non-inverting
> [Model file] typ.mod typ.mod typ.mod
> [Rising waveform] 50 0 0 0 NA NA NA NA NA
> [Falling waveform] 50 1.8 1.7 1.9 NA NA NA NA NA
>
>
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-- Lynne D. Green <lgreen22@mindspring.com>|------------------------------------------------------------------ |For help or to subscribe/unsubscribe, email majordomo@eda.org |with just the appropriate command message(s) in the body: | | help | subscribe ibis <optional e-mail address, if different> | subscribe ibis-users <optional e-mail address, if different> | unsubscribe ibis <optional e-mail address, if different> | unsubscribe ibis-users <optional e-mail address, if different> | |or email a written request to ibis-request@eda.org. | |IBIS reflector archives exist under: | | http://www.eda.org/pub/ibis/email_archive/ Recent | http://www.eda.org/pub/ibis/users_archive/ Recent | http://www.eda.org/pub/ibis/email/ E-mail since 1993
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