ASSURA blackbox LVS问题请教

dyandwanzi

' N" v- e2 {# N2 B/ ?$ L' e8 q基於無 gds 數據的標準單元 LVS ，所以只能將標準單元設置成 blackbox (我沒有用?blackboxcell，因為extract rule裡沒有找到 pinlayer的定義)。現在的問題是ASSURA在提標準單元版圖時，會多提出pin。比如CLKBUFX4這個單元schematic pin: Y A VDD VSS，layout pin: Y A VDD VSS avC9 avS10。不知道avC9 avS10從哪裡來（用的是arm sage-x的庫，應該單元內部都有襯底阱接觸，會不會是這個？）？那麼正確的基於無gds資料的標準單元ASSURA LVS是什麼呢？

LVS用的 GDS 數據來自 Encounter ， streamout 的時候選擇將標準單元 pin 的名字導出並用相應的層號 map 。然後將此數據streamin到virtuoso（用默認設置），導入的版圖中標準單元內部只有 metal1層和相應pin的label。

多謝

veteran

就如你所說，正統的Assura blackbox flow就是要在extract rule中加入pinlayer的定義，然後使用?blackboxcell去run LVS。

& R" d" k# o! F7 K, X& T9 G2 v/ _但改extract rule的過程，大約分成二步：
1. Add pinLayer() description in layerDefs() part
2. merge it with normal metal layer by using geomOr().
# w* I, q/ @' u* k$ [
可參見以下sample:
===========================================================
drcExtractRules(
layerDefs( "df2"
nwell = layer( "nwell" )
% @1 N3 C' L' U8 @( C+ Ynimp = layer( "nimp" )
* v9 M/ x& l2 ]% ~; Y  P! tpimp = layer( "pimp" )
oxide = layer( "oxide" )
: h4 v2 M, F" [3 |pres = layer( "pres" )
poly = layer( "poly" )
0 {, O. y, n& G1 j3 j1 G9 \contact = layer( "contact" )
% W6 l* ~2 O. T2 T. C: Lmetal1 = layer( "metal1" )
via = layer( "via" )
% R3 s4 N7 q3 N. c7 v) ]metal2 = layer( "metal2" )
: i6 n1 r- b, o8 E6 ipolyPin = pinText( "poly" )
metal1Pin = pinText( "metal1" )
metal2Pin = pinText( "metal2" )
metal1BBpin = pinLayer( "metal1" ) ;reads in dfII black box
" `/ J; m$ t& |pins on metal1
& w0 P/ D# {) k8 B, F3 z" csubstrate = cellBoundary( "*" )
3 m! ]7 }* z2 O$ v2 U! X: }" Z3 l);end layerDefs section
% q5 {- J( y7 R2 H;Define p-substrate region
) q4 M5 @9 Q6 f; j" B6 K) l;-------------------------
psub = geomAndNot( substrate nwell )
;Define device recognition shapes and device terminals
3 X) X% _: j: S' c;----------------------------------------------------
ndiff = geomAnd( oxide nimp )
& |  @8 w# Y. |! updiff = geomAnd( oxide pimp )
ngate = geomAnd( ndiff poly )
- {. Q2 t7 j0 x. ~4 u. k, G: Pnsd = geomAndNot( ndiff poly )
# u. F. a8 _3 v, mpgate = geomAnd( pdiff poly )
psd = geomAndNot( pdiff poly )
presBody = geomAndNot( pres via )
presTerm = geomAnd( pres via )
5 l3 J3 W) z/ };Merge black-box pins read in from pinLayer command with
$ o( u0 n7 R( `( ]" }- l% c" aconductive layer
( Y/ i6 p3 d* b/ ~& @4 s;---------------------------------------------------------------
" U! R' W5 U7 N--------
metal1 = geomOr( metal1 metal1BBpin )
;Define connectivity of layout
;-----------------------------
geomConnect( via( via metal2 metal1 presTerm )
via( contact metal1 poly nsd psd )
5 W/ s  o5 ?7 i1 Y# p2 clabel( polyPin poly )
  p- E) p9 t; z7 m0 Jlabel( metal1Pin metal1 )
label( metal2Pin metal2 )
)
geomStamp( psub psd error )
# s# f" M( B: b6 g. r8 ngeomStamp( nwell nsd error )
0 U9 [7 t8 g' H5 r....................
3 ]; U, @# ~5 p" V2 G8 ?===========================================================
% c; I- w7 T2 z% A
! S$ T4 M; x" B( {& J試看看囉..
; I& G- N. {" z* EVeteran