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2020-1-14 15:59 |
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FPGA导出的IBIS模型如何编辑修改差分的模型？0 h0 X8 _# d3 Q# A* Q8 W) t- P
) M+ I+ m( M' U% _- C' j- v发现导出来的默认没有差分定义的模型（虽然IO分配上定义差分对）
, s5 m+ [8 z0 M$ O o8 p, r如果只是在IBIS文件上手动添加 差分对管脚是否够用？# |' I7 \2 J/ @" c' j
[Model] DQ_FULL_800% }8 m) K1 U( d' c/ y& T
Model_type I/O0 ~6 @3 S' r* q2 s
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6 V6 m4 t7 L K! z XVinl = 700.000mV
. [; ]& x5 {# ]& D7 _9 iVinh = 1.100V
8 M" U; L/ P. M3 Y1 X: ~Vmeas = 900.000mV
( A8 Q/ P4 `6 s& zVref = 900.000mV7 k: v' p& Y2 g' ?0 u
Cref = 0.000pF z- m( k+ R. ? H% L
Rref = 25.000Ohm1 G0 Z4 Z1 G8 |' U" w- M" i6 h
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9 ^- ~7 k8 J1 }$ U2 ]) [| typ min max% J5 J" R- y8 s. u7 ~$ ?/ _
| G! T" K& |; `
C_comp 2.466pF 2.316pF 2.616pF
/ U) x! h# ?% {1 F: ^: l|
4 v8 }& Y, M& u# B[Model Spec]" o/ {3 s' W% ~ k% w7 ~9 t7 t, Y, p
| Input threshold voltage corners& s( M+ \# B& Z" z6 y, y2 p
Vinl 0.700V 0.650V 0.750V/ R) P3 D* N" p, C" F/ u( e
Vinh 1.100V 1.050V 1.150V2 x) ]) y, U9 V; I( n
|5 V4 t# o% w% F; X& ?! x8 [
| Measurement voltage corners
4 |+ O- @ N0 u% Q5 p1 yVmeas 0.900V 0.850V 0.950V
3 p% V$ M* k$ {$ @2 b|
) L$ f4 A) F+ K' N| Timing spec test load voltage corners6 @1 D, M- J( m s. u$ p5 p+ h
Vref 0.900V 0.850V 0.950V
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[Receiver Thresholds] / S# n) o+ V' {& ~
Vth = 0.900V
( c$ L8 b* Q( tVth_min = 0.882V! H. X- Z! ?8 y+ x; X) ^# d* T% |
Vth_max = 0.918V2 n# g; I S/ w6 K+ a. U
Vinh_ac = 0.200V- d7 |- j! R* a" ?2 G# J! `& \
Vinh_dc = 0.125V
# h5 b" o7 l/ p3 c8 ]Vinl_ac = -0.200V6 b. u; p' m2 p& l; o9 ~
Vinl_dc = -0.125V# @9 ]) {% e6 O
Tslew_ac = 5.000ns |Not specified, so set to high value, V$ p$ h! A- H$ X* ]1 g
Threshold_sensitivity = 0.50; L3 _- t9 @) G0 J3 r5 Q6 s. K
Reference_supply Pullup_ref( X# L" S* A" K& ~9 }
|7 D a' T( D# w$ V
[Voltage Range] 1.800V 1.700V 1.900V/ t- J6 t4 x8 o4 T) g* B% Y- I9 e
[Pullup Reference] 1.800V 1.700V 1.900V
& O2 L- E5 ]9 i: \- Q5 J% i Q1 ^| Junction Temperature (Ambient temp is 35C typ, 105C min, -40C max)
( ]+ k- W7 v9 M" r! O[Temperature Range] 50.0 120.0 -40.0
# G } j3 N$ ||( y& X4 i" g- v% d8 X
|***************************************************************************3 P0 Q+ z' ~1 g: x
, F v: M6 z0 X+ _# i( o+ W/ g
[Model] DQS_FULL_800
1 `0 J" {4 E' W0 G* j, b1 r3 xModel_type I/O0 z$ c" P/ Y& D, R0 w) [8 a, e
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$ K& y- F$ b$ C% L; p, } F) Q1 FVinl = 700.000mV
) s$ n% U. O2 o0 K2 Z2 aVinh = 1.100V
/ }$ X. R% r$ T5 Z/ T+ _! T5 k! ?Vmeas = 900.000mV7 B" @; l: T: C, n, S9 j
Vref = 900.000mV
# r$ T+ d G. j# M; n" {4 eCref = 0.000pF
: @8 k) K( S% W2 e1 fRref = 25.000Ohm6 i# k/ U2 T- ]& {$ M
|( ^# V# n+ g' F" |2 G9 z/ f
| typ min max
8 S5 i: q! x$ P t$ O/ O|
, P! ^3 @& J' s: f3 y! UC_comp 2.466pF 2.316pF 2.616pF
6 s! }, L' Z+ B|/ ?6 t3 \; ~4 R n
[Model Spec]
. N: [. ~" k) K% ]* T5 Y' A3 l, r| Input threshold voltage corners5 h& Q( ~$ S5 q f" U: g8 d
Vinl 0.700V 0.650V 0.750V0 o+ g g: H3 S; S6 f
Vinh 1.100V 1.050V 1.150V
8 a- ~* n$ ?5 S1 Y|
9 t" n F2 S% L4 T| Measurement voltage corners
- X- _) P7 A- d+ s4 G; }/ qVmeas 0.900V 0.850V 0.950V: b) S- a6 }% f, O% C* r) w3 j! z
|
. _; p6 ]/ c. {$ B1 w1 [| Timing spec test load voltage corners
; c- H5 b4 e% \ E. R0 A9 ^Vref 0.900V 0.850V 0.950V* H8 R3 v8 }. X8 ?; ]4 n
|
* N% B9 g& R: E( x6 l[Receiver Thresholds]
" P4 L+ u7 b) ]: q- N/ F|Vth = 0.900V
& {8 \0 O. b+ b& d& g|Vth_min = 0.882V
+ l, K5 R- ^' G1 R, E|Vth_max = 0.918V& t9 u6 W2 Q4 ?1 r! O* W* F( B" {
|Vinh_ac = 0.200V" E$ s" Y1 K7 s3 K
|Vinh_dc = 0.125V
: p: x+ q7 O2 q|Vinl_ac = -0.200V
: C) y/ b! c7 Z/ {4 `8 x|Vinl_dc = -0.125V
/ j3 x5 m3 f4 _|Tslew_ac = 5.000ns |Not specified, so set to high value
& H8 ]+ H( R" K! ?+ Y|Threshold_sensitivity = 0.50# A' {2 [8 Y3 P) b1 S
|Reference_supply Pullup_ref
: M6 b, X7 L" S0 ~|
# o! _! i1 z! N/ i|NOTE: If using the IBISCHK 4.2.1 or older parser, Differential receiver 9 U0 T5 p1 _0 G) J- \
|threshold parameters must be commented out because the parser generates
* M) j) j" v' I5 F4 D|errors for multiple differential models.
! b6 _1 y" A% i|
. z/ d Q5 ^6 Z" jVcross_low = 0.675V* a O: A8 a4 ]* g1 \
Vcross_high = 1.125V
+ u& c! o Q8 C1 s' L WVdiff_ac = 500mV! h" c: G. j1 }( j; L8 m5 V K, Q
Vdiff_dc = 250mV
$ @" x; Z: M: gTdiffslew_ac = 5.000ns |Not specified, so set to high value# d5 V# [4 s' j" r
|. J5 C4 ]4 q5 \( }, J2 {
[Voltage Range] 1.800V 1.700V 1.900V
" a9 t' z. J* f( m[Pullup Reference] 1.800V 1.700V 1.900V
/ v- B3 J- o0 R8 L, ~2 }| Junction Temperature (Ambient temp is 35C typ, 105C min, -40C max)* n; O$ W! Z Y
[Temperature Range] 50.0 120.0 -40.0; n; Q& ^8 e8 o/ U
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5 R# D6 _+ y6 s/ g, z/ t|***************************************************************************& ~! N: h9 V9 s: c
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+ t0 l8 T" C9 } _* K. K1 C+ {9 {/ d
/ M* f0 e% T% b- [3 d这是从 美光DDR2的IBIS模型里面截取出来的，对着DQ与DQS在模型上的定义
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====================================================================================" F# z4 O% w( v ~9 ~/ o: O+ T
c5 W& u @0 k Z2 q. G6 V; N' j$ C. o/ r% v" |
手动修改编辑成下面的这样的时候发现编辑器会提示错误
' g% |: h" Y2 u6 }# O|
5 Q. X/ A" k% u$ G[Model Selector] DQ+ M8 T: R3 V. w& Y
| Z( P G* E7 E* A. S
DQ_SSTL18_II_F_HR* N& j. d, ~5 G- \- T9 [/ x& E+ F
DQ_SSTL18_II_S_HR
+ d6 V9 w% [" U/ ^3 U9 L1 X+ _DQ_SSTL18_II_F_HR_IN50
Y: n8 F4 y& W, l' C: mDQ_LVCMOS18_F_4_HR g& Z. H4 Y) f$ R
DQ_LVCMOS18_F_8_HR4 p( M5 R7 A4 t! F r1 ]- z& s V
|2 k6 W+ e# p0 g( B7 G% n
[Model Selector] DQS7 ^8 i: W/ _- `7 C- S/ ]
|+ t( B5 U5 `6 w+ ]$ g {# W
DQS_SSTL18_II_F_HR
# ~: [8 y- T; L& X' w3 ]& S% BDQS_SSTL18_II_F_HR_IN50( c. n# D5 J6 l1 i- b
+ }1 K' Z' O) b1 L$ O: c& V# k
ibis编辑器检查的时候发现提示的错误是：incorrect number of line items for keyword model selector expecting 2
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发表于 2020-3-20 10:48
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