标题: Capture-Allegro最好的设计习惯 [打印本页] 作者: John-L 时间: 2009-8-14 10:08 标题: Capture-Allegro最好的设计习惯 本帖最后由 John-L 于 2009-8-14 10:10 编辑 , Z+ J \6 ]7 B* `7 u/ Z$ }. J% c
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做到下面的要求,ALLEGRO NET-IN就轻松多了:! k. G5 V& ]5 ^
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Best practices for Capture-Allegro % L& I( H6 U% @, A2 \8 GBest practices for preparing a library for Capture-Allegro PCB Editor! s1 Y, N& k1 [0 J. [1 {5 l7 u3 i7 z
flow : ]) ^ i1 }4 s1 @' T􀂃 Limit part and pin names to 31 characters# L/ f# H& i0 a6 w( s9 q
􀂃 Use upper case characters for part/symbol names, part references) ] J8 d; E9 J. [" b9 |; r
designators, and pin names6 y! }4 P2 L; v! Z
􀂃 Do not use special characters to assign part names, references& z! C5 s' w [$ x' a9 @
designators, and pin names# }1 n. X0 V: V
􀂃 Do not use duplicate pin names for pins other than power pins9 j" A3 n+ c: Z5 L O% m
􀂃 For multiple power pins with the same pin names, do not make some- ~/ I3 o, j. W
pins visible and other invisible. c, D o2 f0 I
􀂃 Do not use "0" as a pin number2 l* m M: d- S( ?) W9 f
Best practices for Capture design for Allegro PCB Editor4 Y4 w# i7 J8 Y1 J$ Z2 s& o {& N2 K
􀂃 While defining a net list alias or a net name ! Y# A Y! g8 T. O9 e! O3 u) F9 a( A: f2 P) P• Keep the maximum length of a net name or alias up to 31 C1 {- I, a$ r
characters4 m5 f. Q9 y# _$ K
• Do not use lower case or special characters in a net name - P7 A7 l, V7 f1 N4 e {􀂃 Avoid using "Power Pins Visible" property at design level ! T W$ l: Q7 }/ ]/ h; K; m􀂃 Use net to connect pins2 O) H$ B: R: q1 W; S5 a- G
• Leave room for assigning a net name. Pin-to-pin connection ( s/ a% b. X4 ?; B- [7 h% ~changes the net name when a user moves a component6 X& r8 v# j. [' @+ S) D
􀂃 Run the Capture DRC command before generating Allegro PCB Editor1 ], K2 Z; A2 X; m ~1 B( _
netlist ; v+ z; K5 ~: U3 @* z+ k1 i􀂃 Set path for Allegro PCB Editor footprint before running Netrev - m; ?0 c! h& h, @# ^5 H6 nBest practices for smooth back annotation . @- ], I" I8 E( P. C􀂃 Do not change design name, hierarchical block names, or reference # U# B# s/ U6 D8 B& Fdesignators in Capture after board files creation4 e+ P& F/ k5 D5 C
􀂃 Do not edit a part from schematic in Capture after board file , u2 ^1 u: e) o! l$ [creation! A- l9 O+ W, z2 I- E7 V/ T
􀂃 Do not replace cache as it changes the Source library name and part/ y) w8 `. F1 ^: W: {* }# `9 V# {
name, in capture2 p# ?9 y& d1 `$ N. y8 J: b
􀂃 Do not change the values of component definition properties in % | K; T. F8 b6 H' _capture after board files creation( g0 ]1 {( J& i% n( c
􀂃 Do not change Design file/root schematic/hierarchical block names9 F! o9 C7 Z$ B* w0 S
in Capture after board file creation1 G: g& \2 h6 ~7 K/ C7 g; F
􀂃 Do not add or delete components to or from the schematic design # ]% B# W8 z$ k" m& q7 Bimmediately after the board file creation. Add or delete components! ?; D2 Q$ d* U r" ^" B: E
after finishing the back annotation process 3 x7 |5 l' ^! e7 g$ S; V- 2 -% L$ W7 `2 ~0 F" K/ v
􀂃 Do not add any additional components in Allegro PCB Editor. Instead,8 W+ B( ~- Y* d9 x
add components in Capture and take them to Allegro PCB Editor, A3 Y8 Z) j; b* b1 [
􀂃 Do not add, rename, or delete a net in Allegro PCB Editor / a5 l- c4 W1 e+ p8 l& w' i􀂃 Do not change the format for reference designators for parts in) ~$ Z1 O- b, K5 H3 z1 P! z
Allegro PCB Editor as <Alphabet(s)><Numeric><Alphabet(s)> or " S! a( g" r) C. u7 r6 n4 m- l/ D><Alphabet(s)>-<Alphabet(s)> " y$ E7 D5 R$ |􀂃 Run Allegro PCB Editor Dbdoctor before running Back annotation by & o, l7 e Q6 z3 c. u5 h0 vselecting the Database Check command from the Tools menu in Allegro / H# b+ f6 m. N0 `7 q/ oPCB Editor) g8 T E" a9 o
􀂃 Make backups of the original design before updating the design with . t5 w$ O0 D' V: S# Nthe swap information in Capture6 n- J0 q7 [& t3 s5 m5 u3 u$ q. }
􀂃 Back annotate the design immediately after making the board file.) {. v( E9 Y( O3 [5 ]5 l
Though it does not a mandatory step, back annotating the design $ B2 J4 {* F/ g. Wbefore placing components helps avoid problems in back-annotation : V# k- B& o) p0 Sat a later stage. 5 t5 V: k+ F/ `; P) ]If back annotation at this stage generates an empty swap file, you * e% a8 M {- i0 Bcan proceed with placing and routing the board file. In case any 6 z W1 K. B" I2 M8 Y0 G0 v+ h% fproblems are detected, you must correct them in the design file and! j* i7 P- c/ ? O2 [! v8 V: S
generate the board file again until an empty swap file is generated.
