TA的每日心情 | 擦汗
2020-1-14 15:59 |
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签到天数: 1 天 [LV.1]初来乍到
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FPGA导出的IBIS模型如何编辑修改差分的模型？/ r/ I" H( M. e/ z) J' @. `7 W
3 E& ~& f+ B8 @7 |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）. r" f/ r7 W( d- K' B* p8 O
如果只是在IBIS文件上手动添加 差分对管脚是否够用？/ K- J" @* `+ R0 I& l9 G! }0 O
[Model] DQ_FULL_800
3 z4 b0 |3 R, wModel_type I/O
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Vinl = 700.000mV
/ j1 t4 ]3 l# S" b* a; kVinh = 1.100V u- t7 A! [5 B6 ~9 C
Vmeas = 900.000mV4 i4 _: |) P" d* j9 K$ y( c
Vref = 900.000mV
8 p5 J3 {) E3 D6 N1 xCref = 0.000pF
, y8 s8 e; @6 W L% R- iRref = 25.000Ohm
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. M8 g; @0 r @4 O: Y% g/ Z) ]6 u| typ min max1 n6 Q6 t3 I; c% K
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( p/ h& R0 ^5 ]( ~/ o! C. GC_comp 2.466pF 2.316pF 2.616pF. K5 O% O4 q$ |3 j, E
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: ]$ w, ]* k, a+ u[Model Spec]
7 |9 N1 C8 ?2 \, I! e8 K% Z# U| Input threshold voltage corners1 m" @9 W8 J8 [
Vinl 0.700V 0.650V 0.750V
3 K+ b, ~1 \* o, s% t7 Z; V( ~$ cVinh 1.100V 1.050V 1.150V$ o# ~. y# U% N: x0 D! N" u( ~
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. U* w8 p. v0 i* s* n: ~& v| Measurement voltage corners
/ z0 D- v H% T+ y8 o2 F' ]Vmeas 0.900V 0.850V 0.950V1 H4 A2 f4 _( c8 \
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| Timing spec test load voltage corners2 Q; c6 x6 M& D# @6 B
Vref 0.900V 0.850V 0.950V
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- I! _$ q! k# J z4 E! G* f% s+ \3 z[Receiver Thresholds]
2 ~% r9 ?! [# q" J% |$ k9 SVth = 0.900V
; g; t$ v- A, d( Q2 {. \% CVth_min = 0.882V
: R7 F5 t* L7 L9 l* w* _6 k# DVth_max = 0.918V( ^* |! _5 H7 N$ o. d
Vinh_ac = 0.200V
) I% W: C1 G+ l& cVinh_dc = 0.125V
+ \3 ^6 `5 U. I: lVinl_ac = -0.200V) ]0 h- _0 u* C6 k
Vinl_dc = -0.125V
# o! z; E' v( m$ N9 \" L3 `3 _; T: jTslew_ac = 5.000ns |Not specified, so set to high value' t6 |8 L2 `9 I
Threshold_sensitivity = 0.509 U: v& Y9 `" m0 }% z' X0 Q; s
Reference_supply Pullup_ref
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[Voltage Range] 1.800V 1.700V 1.900V) c7 L% L6 F9 ~8 H! A$ v/ {
[Pullup Reference] 1.800V 1.700V 1.900V( ]5 d5 ]! k" @( b$ \. l
| Junction Temperature (Ambient temp is 35C typ, 105C min, -40C max): v% t' u1 I, X9 e' e1 e
[Temperature Range] 50.0 120.0 -40.0
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|***************************************************************************3 G2 Z8 {4 @8 E3 V: j
7 ^* E# J! a$ [) e3 k& [$ V; |[Model] DQS_FULL_800. J5 f, Q, T5 J/ p/ K9 _6 f' j
Model_type I/O
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, b7 `+ @$ v7 C) cVinl = 700.000mV$ g& @- y8 {+ ^+ U9 Y i V* {9 C
Vinh = 1.100V6 s$ [+ q0 e, A+ v0 v6 ~
Vmeas = 900.000mV
) u( N9 f. P" h# [2 ^: X! ~0 t$ t. UVref = 900.000mV4 M4 {) h5 `/ z1 H( V
Cref = 0.000pF
% }* Q, C# ?; A* m. R$ n+ iRref = 25.000Ohm+ l" n3 u4 A; y% f% ^9 P' h: r
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- }1 l& s" G; y& z| typ min max
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C_comp 2.466pF 2.316pF 2.616pF4 w: J- W q) U/ R$ @# T4 ~
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[Model Spec]' r9 a9 O$ m9 d/ w* x2 _9 J4 W
| Input threshold voltage corners* B: s! S9 a2 k/ o! H* x2 i) ^$ ~
Vinl 0.700V 0.650V 0.750V2 p7 B* w& j! Z. z" e8 C+ O8 k
Vinh 1.100V 1.050V 1.150V: {2 [, P6 @) I
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( s$ b) h1 p; Q) ~/ n; l; h| Measurement voltage corners
( C3 X, h- A+ w+ F: SVmeas 0.900V 0.850V 0.950V
7 O9 s c! U+ n1 B1 p|
" G/ Q! w2 l( G' W6 l1 d) `) w| Timing spec test load voltage corners" ~! [% K0 y+ [ o
Vref 0.900V 0.850V 0.950V
* f: e0 B) k. O|
( x5 E% y( ~* l) k1 P: b- b[Receiver Thresholds]
& R+ ]+ t9 B8 Q+ E4 i|Vth = 0.900V# c% f& `6 R+ s; f2 e
|Vth_min = 0.882V# O1 B+ W6 X5 i9 H5 S* \0 a% c
|Vth_max = 0.918V+ X& ^$ g. Y' p0 G% W
|Vinh_ac = 0.200V, Z& a% n3 v, @/ j6 m2 ^0 u- k! A
|Vinh_dc = 0.125V/ ?3 K& F6 J, O3 C! [- ]( o
|Vinl_ac = -0.200V+ }' H8 N# F( U# s
|Vinl_dc = -0.125V/ T. U8 E4 B3 v" d4 ]9 I
|Tslew_ac = 5.000ns |Not specified, so set to high value3 c8 F. n$ f" y8 d6 B, |
|Threshold_sensitivity = 0.50
* A& E0 J9 v. i|Reference_supply Pullup_ref3 t4 U5 ^# `$ L" {& T" T3 j/ Z
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' O4 z4 l. g! f A- ||NOTE: If using the IBISCHK 4.2.1 or older parser, Differential receiver
) J) v9 I: K4 \7 } w|threshold parameters must be commented out because the parser generates& }2 R' B" ~: o. B
|errors for multiple differential models.
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. [! j1 \+ H* w2 w: HVcross_low = 0.675V+ m3 G' F" C1 c3 ]1 w0 w' h# \
Vcross_high = 1.125V$ h2 M; {2 ]. ]3 {. D% ^- a) G
Vdiff_ac = 500mV
7 X" T. s: H" l. M+ \Vdiff_dc = 250mV. z4 Q0 |4 v1 y5 M+ O! }
Tdiffslew_ac = 5.000ns |Not specified, so set to high value
5 s0 f' i% _1 Q X# W6 u0 n|
4 O+ s' Y, J& u" ]: t2 ]9 h }[Voltage Range] 1.800V 1.700V 1.900V5 H, S3 l. u1 g
[Pullup Reference] 1.800V 1.700V 1.900V4 _' f4 J$ `4 H# U3 I
| Junction Temperature (Ambient temp is 35C typ, 105C min, -40C max)
+ a, B" X3 l* F" g, X. u% `0 b' g[Temperature Range] 50.0 120.0 -40.07 [9 E) P! Q: n/ k7 y$ t
|) c/ U$ K; g9 y9 `/ z8 D
|*************************************************************************** L, u+ b+ j) J& P& z8 z
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g3 v8 ?1 ]2 ~' f! F0 p. V. E1 q0 {) i
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( n: e8 V1 s7 Z: b- j6 ]
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====================================================================================4 A2 J1 V0 @/ N. g
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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" }7 n! `0 ^& Z4 c
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$ r& @/ r+ p9 U( s4 D2 Q7 c[Model Selector] DQ& B5 h% U% S; q4 g8 X8 d
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' c L+ }0 q! ?DQ_SSTL18_II_F_HR: {8 C+ o) V% ^9 L
DQ_SSTL18_II_S_HR
1 T' l* f: O1 t7 iDQ_SSTL18_II_F_HR_IN50- n) g) @4 K2 x6 W0 [ ]& K
DQ_LVCMOS18_F_4_HR) \. Q3 @+ p* ^
DQ_LVCMOS18_F_8_HR e# z$ A! }+ `, Q& v
|- U" A k6 N4 G7 a1 ^: }
[Model Selector] DQS/ ?0 @4 b- U8 z _9 R$ n
|8 _% t4 M2 w! U! Q" E9 y+ A9 W
DQS_SSTL18_II_F_HR
1 g; s1 a1 ]1 E' [' D5 x- b2 ^DQS_SSTL18_II_F_HR_IN50/ _2 M1 D# X/ b" h1 d) y) d4 z/ N
) B# R/ T+ c Q7 r# [; q jibis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: I& @. L! L9 T/ B# r9 K/ h2 a
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发表于 2020-3-20 10:48
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