[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，
4 i" \1 j+ q" o9 B* r" {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
以及IBIS開放論壇相關資料
" F2 V0 W& ~! u. P- V; b1 D1 \- c% dhttp://www.vhdl.org/pub/ibis/
又在google大帝的協助下，找到可以協助檢查IBIS語法的Tool
0 G  P  N1 k& Ihttp://www.mentor.com/products/p ... visual_ibis_editor/

( p7 h0 t& M* s" a9 O- c初步研究了兩三天，現在小弟用簡單的level shift去做測試，
) P8 \# u& r8 w$ t- D: f/ ~跑出了下列的error，實在不解，請問各位大大可否幫小弟解題...
' e% Z$ |6 y- }9 [6 l6 F
ERROR (line  243) - Invalid dV/dt_r Typical Value ("0.0/NA")
0 B: s: h# V1 ^- O+ }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
2 x: }6 q& c" k& J; J& ]' kERROR (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
9 P6 B# M* R" k4 jERROR (line  243) - dT must be greater than 0 in a Ramp specification
6 x0 L5 _5 O3 _* \& j* `  I! A0 JERROR (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 Minimum Value ("0.0/NA")
3 X0 ~" M- M0 z. d) K" O. l! L2 bERROR (line  244) - dV must be greater than 0 in a Ramp specification
6 w2 a1 X1 r; j- a8 U3 z0 BERROR (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
7 i+ {2 d6 k. E' Z9 ^ERROR (line  244) - dT must be greater than 0 in a Ramp specification
" B" J% {% [8 g) |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
ERROR - Model INV_A: The [Rising Waveform]
      with [R_fixture]=20000 Ohms and [V_fixture]=1.2V
      has TYP column DC endpoints of  1.20V and  1.20v, but
# x  r: }6 @# Z5 ?% {. o* \      an equivalent load applied to the model's I-V tables yields
+ I. u; Q1 o$ z      different voltages ( 1.18V and  1.18V),
      a difference of  1.#J% and  1.#J%, respectively.
ERROR - Model INV_A: The [Falling Waveform]
1 o: U5 o; ~5 M7 |7 q4 O. l      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
0 R( h9 f( g1 {$ d* N      different voltages ( 1.18V and  1.18V),
      a difference of  1.#J% and  1.#J%, respectively.
- L& i5 ?* p6 s6 R5 MERROR - Model INV_A: The [Rising Waveform]
7 ?- b# o9 _2 i- e$ g/ i2 R# U      with [R_fixture]=20000 Ohms and [V_fixture_min]=1.2V
/ b7 v4 ?. ^) i- \      has MIN column DC endpoints of  1.20V and  1.20v, but
0 B1 P6 `( j# A+ ^! l, P6 U      an equivalent load applied to the model's I-V tables yields
      different voltages ( 1.18V and  1.18V),

a7893657

看來好像大家都沒有follow到，後來小弟自己上網估了一下，
: V, f$ u( _/ t( f9 C9 j! a% U4 |
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，
1 Z$ ]( F( Q3 R/ t6 p
只要將適量的調整R_fixture，便可以...

sd5517805

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