[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，
1 l( b; S( Z; P0 z6 O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
/ q) ]" ~  z. F7 @9 U5 ?以及IBIS開放論壇相關資料
4 I6 s0 g2 k# n1 F1 \http://www.vhdl.org/pub/ibis/
+ ^4 ?* ^/ G& m/ @# r" {又在google大帝的協助下，找到可以協助檢查IBIS語法的Tool
6 D) a; P' ^% P7 R. m$ {http://www.mentor.com/products/p ... visual_ibis_editor/
" w6 f2 \: O# H/ n
初步研究了兩三天，現在小弟用簡單的level shift去做測試，
: l7 k0 e' Z1 K5 F- \% i+ z跑出了下列的error，實在不解，請問各位大大可否幫小弟解題...
. z" G4 n) ]: e2 ^. h) V! k
$ a/ V3 R. k2 H# u: QERROR (line  243) - Invalid dV/dt_r Typical Value ("0.0/NA")
0 {2 F4 `9 D+ ^8 @; v& HERROR (line  243) - Invalid dV/dt_r Minimum Value ("0.0/NA")
ERROR (line  243) - dV must be greater than 0 in a Ramp specification
) q; D5 s( H+ S7 YERROR (line  243) - dT must be greater than 0 in a Ramp specification
8 W4 B& ?( G& H6 Y! ZERROR (line  243) - Invalid dV/dt_r Maximum Value ("0.0/NA")
ERROR (line  243) - dV must be greater than 0 in a Ramp specification
) V; }5 M( C3 g' qERROR (line  243) - dT must be greater than 0 in a Ramp specification
: f( ^5 Z& o: ^5 U4 [0 vERROR (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
# Q" R5 V+ q- e& ZERROR (line  244) - Invalid dV/dt_f Minimum Value ("0.0/NA")
ERROR (line  244) - dV must be greater than 0 in a Ramp specification
; a( f4 I" z' R8 }" p$ x3 |% E8 {3 qERROR (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
( V9 s$ h; Y. i5 nERROR (line  244) - dT must be greater than 0 in a Ramp specification
- E, ]4 D0 N1 R7 X# D. zERROR - Model 'INV_A': Rgnd is set when Model_type is not Terminator
( T( Q. f( [$ b/ G9 X- gERROR - Model 'INV_A': Rpower is set when Model_type is not Terminator
ERROR - Model INV_A: The [Rising Waveform]
; s' R2 d/ n  N( c: o& h$ N6 A, F      with [R_fixture]=20000 Ohms and [V_fixture]=1.2V
2 B* c  e7 y7 [( }5 L) i      has TYP column DC endpoints of  1.20V and  1.20v, but
      an equivalent load applied to the model's I-V tables yields
2 k; C3 r; \$ V8 N      different voltages ( 1.18V and  1.18V),
; O4 S( ^2 V6 V" ^% E; J      a difference of  1.#J% and  1.#J%, respectively.
9 h# o/ R! B4 {& y5 y' R! _ERROR - Model INV_A: The [Falling Waveform]
! h. ]4 }! k5 s+ I      with [R_fixture]=20000 Ohms and [V_fixture]=1.2V
' \1 x0 z/ P! S. X- I0 @1 r      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 [Rising Waveform]
4 ~- f7 x6 D1 M      with [R_fixture]=20000 Ohms and [V_fixture_min]=1.2V
: p: S6 n, M  D. l6 R4 L8 b2 ]  F" n9 ?5 p      has MIN 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),

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，
5 l4 K/ I# x+ Y0 J  \) U& P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...