[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，
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
http://www.ece.ncsu.edu/erl/software/s2ibis3.php
+ g  A; W9 f9 ]+ [以及IBIS開放論壇相關資料
http://www.vhdl.org/pub/ibis/
: B3 B# U+ f! z- G又在google大帝的協助下，找到可以協助檢查IBIS語法的Tool
" ]2 |6 ^. \' a4 t6 ?2 Khttp://www.mentor.com/products/p ... visual_ibis_editor/

0 {% G" W, B; p$ O& t6 g/ M初步研究了兩三天，現在小弟用簡單的level shift去做測試，
跑出了下列的error，實在不解，請問各位大大可否幫小弟解題...

( o$ D5 f! W* f+ r: RERROR (line  243) - Invalid dV/dt_r Typical Value ("0.0/NA")
ERROR (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, w" N2 M$ G' ~4 f0 x, \, dERROR (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
5 L& s( k2 e2 x& B9 eERROR (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
ERROR (line  244) - dT must be greater than 0 in a Ramp specification
" s6 K2 u. t9 I% N, OERROR (line  244) - Invalid dV/dt_f Minimum Value ("0.0/NA")
+ X) e& Q: D  _* W! T3 l4 {6 @+ q! YERROR (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
, H# a* b7 C" R4 gERROR (line  244) - Invalid dV/dt_f Maximum Value ("0.0/NA")
7 u1 A, m* f' V) p0 {! P- d3 xERROR (line  244) - dV must be greater than 0 in a Ramp specification
& q" V7 s% i: F+ C8 K/ wERROR (line  244) - dT must be greater than 0 in a Ramp specification
; G4 {( K4 Y5 G2 g" mERROR - 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
; b( R  K9 T; w0 P% C. eERROR - Model INV_A: The [Rising Waveform]
      with [R_fixture]=20000 Ohms and [V_fixture]=1.2V
: y) ]. j) M; u& z  a+ D7 d2 N      has TYP column DC endpoints of  1.20V and  1.20v, but
      an equivalent load applied to the model's I-V tables yields
5 d9 S% W0 M' v5 c      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
: d4 q3 O2 ~2 T. p      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.
5 _$ x$ r( P7 [/ E$ aERROR - Model INV_A: The [Rising Waveform]
: ?! B) D/ B! E9 {% d      with [R_fixture]=20000 Ohms and [V_fixture_min]=1.2V
* u  b& L* O8 n+ b; l      has MIN column DC endpoints of  1.20V and  1.20v, but
+ G5 f+ t7 w" u& t- J. r      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，

7 {( b2 M* r% I0 ]原來是我spice to IBIS，R_fixture對應到pullup的load line數值偏差太大，
2 \3 i4 ^* d. `& m' g1 y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...