[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，
7 ]7 ~; ^( X1 A3 g  F8 B5 H9 @可以應用於跨部門IP合作，或提供系統廠做系統整合應用，
$ x% r$ ?( I" j9 g) G3 r) B/ J/ R9 H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
http://www.ece.ncsu.edu/erl/software/s2ibis3.php
以及IBIS開放論壇相關資料
& x% V5 V5 f  R: |& jhttp://www.vhdl.org/pub/ibis/
. L7 C7 C4 A9 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/
  \& Y& t  ]* r& C. _, @' P( H
+ [* _5 s4 ~) _, d  d% O( r初步研究了兩三天，現在小弟用簡單的level shift去做測試，
/ S; \& a- N! k9 O! R. [跑出了下列的error，實在不解，請問各位大大可否幫小弟解題...
* c0 o) J5 L; _5 E- g+ `
ERROR (line  243) - Invalid dV/dt_r Typical Value ("0.0/NA")
. R2 R5 P* b7 ?ERROR (line  243) - Invalid dV/dt_r Minimum Value ("0.0/NA")
; Z9 J! C% \" O' uERROR (line  243) - dV must be greater than 0 in a Ramp specification
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")
, K3 B: J: `$ _" M/ w! f0 g2 sERROR (line  243) - dV must be greater than 0 in a Ramp specification
, f$ v* h; F/ `- t3 b" F2 xERROR (line  243) - dT must be greater than 0 in a Ramp specification
ERROR (line  244) - dV must be greater than 0 in a Ramp specification
+ i" h3 G) g7 T. x# P. I6 aERROR (line  244) - dT must be greater than 0 in a Ramp specification
, j, Y9 G- p$ b1 d7 P7 gERROR (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")
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
! Y. K$ K6 O2 w6 HERROR - 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
ERROR - Model INV_A: The [Rising Waveform]
! r: a0 f& X3 j      with [R_fixture]=20000 Ohms and [V_fixture]=1.2V
. f+ X. Z. Z7 }8 S1 n! U      has TYP column DC endpoints of  1.20V and  1.20v, but
      an equivalent load applied to the model's I-V tables yields
$ p3 P% s1 b/ p8 N- r" U- w$ A      different voltages ( 1.18V and  1.18V),
. L, ^! ?$ [9 S& Q6 l      a difference of  1.#J% and  1.#J%, respectively.
! @. A  i4 e  h* I2 `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
- j; h! z2 e7 q2 o2 w- g# ?2 ~- _1 ~      an equivalent load applied to the model's I-V tables yields
      different voltages ( 1.18V and  1.18V),
* Z' U3 x- `  ?      a difference of  1.#J% and  1.#J%, respectively.
ERROR - Model INV_A: The [Rising Waveform]
6 w8 d- y+ Q% s& Y5 D  t; o      with [R_fixture]=20000 Ohms and [V_fixture_min]=1.2V
; S6 @- |* B+ l4 _% p, h      has MIN column DC endpoints of  1.20V and  1.20v, but
      an equivalent load applied to the model's I-V tables yields
4 ?2 R* i/ c( o4 W% j# s      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，

. o- E, m6 i+ @. B0 w1 D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，
- H8 n4 P5 u7 w( _
只要將適量的調整R_fixture，便可以...