[BUG] Spice model to IBIS model......!!!

a7893657

最近小弟在研究IBIS，話說可以將spice model 轉成IBIS model，
$ i3 m1 A2 @- |6 C5 H可以應用於跨部門IP合作，或提供系統廠做系統整合應用，
聽起來還蠻有趣的，於是小弟便由NC STATE University下載免費的轉IBIS的軟體
) {- B( h+ T8 x3 shttp://www.ece.ncsu.edu/erl/software/s2ibis3.php
5 @7 ~! w2 j4 L( n2 Q  j以及IBIS開放論壇相關資料
  z' Q! F& U& J2 v# ehttp://www.vhdl.org/pub/ibis/
  W# m1 m- O) t. r# @" J3 U又在google大帝的協助下，找到可以協助檢查IBIS語法的Tool
http://www.mentor.com/products/p ... visual_ibis_editor/

/ y9 p5 o0 B& c: w初步研究了兩三天，現在小弟用簡單的level shift去做測試，
0 y5 k- [3 P2 g& H# @5 {! y跑出了下列的error，實在不解，請問各位大大可否幫小弟解題...

- m- T' @1 b. b, b! M0 lERROR (line  243) - Invalid dV/dt_r Typical Value ("0.0/NA")
( p7 x  |1 T% N4 r  G( a; @) PERROR (line  243) - Invalid dV/dt_r Minimum Value ("0.0/NA")
ERROR (line  243) - dV must be greater than 0 in a Ramp specification
, r+ p; b& Q0 e' |ERROR (line  243) - dT must be greater than 0 in a Ramp specification
ERROR (line  243) - Invalid dV/dt_r Maximum Value ("0.0/NA")
ERROR (line  243) - dV must be greater than 0 in a Ramp specification
0 M  k0 U6 q' o/ R& _, XERROR (line  243) - dT must be greater than 0 in a Ramp specification
  O9 l1 r3 p9 U5 H$ OERROR (line  244) - dV must be greater than 0 in a Ramp specification
; O8 V3 X  K! ?  V  S  _' {4 _( U* zERROR (line  244) - dT must be greater than 0 in a Ramp specification
' w% O. e2 \7 {ERROR (line  244) - Invalid dV/dt_f Minimum Value ("0.0/NA")
ERROR (line  244) - dV must be greater than 0 in a Ramp specification
ERROR (line  244) - dT must be greater than 0 in a Ramp specification
ERROR (line  244) - Invalid dV/dt_f Maximum Value ("0.0/NA")
+ y* S# f# l' E, f6 Q6 ?, M- |ERROR (line  244) - dV must be greater than 0 in a Ramp specification
0 J7 f  G" Z8 {% [3 I4 B6 f! s- R" lERROR (line  244) - dT must be greater than 0 in a Ramp specification
ERROR - Model 'INV_A': Rgnd is set when Model_type is not Terminator
ERROR - Model 'INV_A': Rpower is set when Model_type is not Terminator
, c# O! n0 H# l! w3 f  F" d6 f6 v- rERROR - Model INV_A: The [Rising Waveform]
/ e' ]# O/ r' w9 p3 t- i      with [R_fixture]=20000 Ohms and [V_fixture]=1.2V
% J0 w  D  U$ Y0 K      has TYP column DC endpoints of  1.20V and  1.20v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages ( 1.18V and  1.18V),
      a difference of  1.#J% and  1.#J%, respectively.
ERROR - Model INV_A: The [Falling Waveform]
      with [R_fixture]=20000 Ohms and [V_fixture]=1.2V
      has TYP column DC endpoints of  1.20V and  1.20v, but
      an equivalent load applied to the model's I-V tables yields
      different voltages ( 1.18V and  1.18V),
      a difference of  1.#J% and  1.#J%, respectively.
/ x# \, X" ~' p8 D; L2 XERROR - Model INV_A: The [Rising Waveform]
      with [R_fixture]=20000 Ohms and [V_fixture_min]=1.2V
; L( x+ o) l  D      has MIN column DC endpoints of  1.20V and  1.20v, but
) r( P% Q) u( A8 j7 h+ i7 U      an equivalent load applied to the model's I-V tables yields
      different voltages ( 1.18V and  1.18V),

sd5517805

謝謝大大的分享,,,,,,,,,,,,,,,,.............

a7893657

看來好像大家都沒有follow到，後來小弟自己上網估了一下，

原來是我spice to IBIS，R_fixture對應到pullup的load line數值偏差太大，
照IBIS有一定的偏差值，超過偏差值就會WARNING，過大就會ERROR，

只要將適量的調整R_fixture，便可以...