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原理图:i放大 o缩小
ctrl+mouse 放大缩小
ctrl+pageup ctrl+pagedown 左右移动
ctrl+n 下一PART ctrl+b 上一PART
view->package 查看全部Part
view->part 查看某一PART
edit->browse 查看part、nets等
alt断开连接移动
R旋转, V垂直, H水平
原理图 R 旋转 shift 任意角度走线 alt拖动元件时切断连接
全局修改器件属性:edit->browse->parts->shift全选所有器件->edit->properties->browse spreadsheet修改即可。
原理图库:D:\Cadence\SPB_16.3\tools\capture\library\Discrete.olb (散件)
建立原理图库:new->library
Cadence olb :ctrl+N 切换到下一PART ctrl+B 切换到前一PART
栅格的控制都在options->preferences->Grid Display
Schemtic page grid控制原理图栅格
Part and symbol grid控制元器件库栅格
**************************************************************************************************************
PCB例程:D:\Cadence\SPB_16.3\share\pcb\examples\board_design
测量距离:display->measure / Find->pins
PCB Editor:右键->cancel 取消
类、子类 color visible
PCB提供两种模式,布局布线,封装库(package symbol)
PCB 封转库中,怎样设置图纸大小?
显示栅格大小?
焊盘—>元件封装
layout->pins:x0 0 ->右键done
dra place_bound_top(矩形) silkscreen_top == assemble_top
assemble_top:x0 0.75 ix 1.8 iy -1.5 ix -1.8 iy 1.5 (add line)
silkscreen_top: x0.6 0.94 ix -1.38 iy -1.88 ix 1.38 (add line)
x1.2 0.94 ix 1.38 iy -1.88 ix -1.38
place_bound_top:add rectangle
x-0.85 1 x2.65 -1
参考标号:layout->label->refdes
Assembly_top 内部
Silkscreen_top 左上角
file->new->package symbol
必须有:1引脚2零件外形,轮廓线3参考编号4place_bound放置安装区
psm元件封装数据文件,dra元件封装绘图文件
BGA272封装:球形引脚0.75 宽27mm IPC标准
PCB上 80% 0.6
pad designer pad->package symbol
file->new smd0_60cir solder大0.1 check
pcb editor:package symbol
dsp6713bga272
setup->drawing parameters 设置尺寸 -5 -36 41 41
setup->grids 0.0254
layout->pins x0 0 x0 -1.27
右键->done
edit->delete find->all off->pins
package geometry: place_bound_top:add rectangle x-3.45 3.45 x27.55 -27.55
silkscreen_top:0.2 x-1.45 1.45 x 25.55 1.45(x间有空格)
x 25.55 -25.55 x -1.45 -25.55 x -1.45 1.45
silkscreen_top:加角标 addline 0.2 加点
assembly_top:add line
参考标号:assembly_top 内部 silkscreen_top 左上角
SOIC焊盘:不规则 建立图形->pad->package
pcb editor:shape symbols cir+rect+cir
setup->drewing param: -2 -2 4 4
setup->grid:0.0254
shape->rectangle:etch x -0.625 0.3 x 0.625 -0.3
shape->circle x -0.625 0 x -0.925 0 x 0.625 0 x 0.925 0
shape->merge shapes(融合)
create symbol rx1_85y0_6r0_3.ssm(图形零件文件)
又一个rx2_05y0_8r0_4.ssm soldermask
pad designer:
设置工作路径:setup->user preference
设置旋转+右键旋转 设置引脚旋转 package symbols
通孔焊盘 大10mil pcb editor flash symbol .fsm
add flash 1.5 1.8 开口spoke width 0.7
anti pad
brd pcb editor
设置尺寸 setup->drawing 精度 mil 2
-4000 -4000 18000 12000
板框 add line board geometry outline
x 0 0 ix5400 iy 4000 ix -5400 iy -4000
倒角 manufacturer ->dimension fillot(圆弧角) 80mil 点角的两线
route keep in :setup->areas->route keepin
route keepin ->all -> unfilled
x 100 100 ix 5200 iy 3800 ix -5200 iy -3800
package keep in: edit->z-copy 图形复制(shape)
package keepin ->all 点击route keepin
find->shape
安装孔:place->manually->placement ->advance seting->library
placement list->package symbols->mtg300_600
edit->move find->symbols
x 220 220 x 220 3780 x 5180 220 x5180 3780
设置层叠结构
setup->cross-section ->layout cross section (内电层plane)
内电层覆铜 edit->z-copy
find->shape option->etch->GND->create dynamic shape
power->create dynamic shape
导入网表:file->import logic ->cadence->import directory
place-> manually
设置栅格点:setup->grids on
setup->drawing options:status/dispaly 需经常查看
pcb布局
手工place:place->manually autohide:右键show
mirror:option、右键、setup->draw option->symbols ->mirror
已放置元件:edit->mirror
旋转:已放置:move ->右键rotate
option->angle->放置后右键旋转->增量
移动:edit->move (框选多移动)
交互式布局:原理图option->preference->enable intertool (millsce)
PCB:placement
原理图选中元件->右键PCB editor select(shift+s)
一page布局到PCB:原理图:edit->browers->part->shift全选元件->edit->priority->new->AGE 1
dsn->tools->create netlist->setup ->configuration file->edit
PAGE=YES->Allow user defined propity
PCB:file->import logic->create user-defined priorities->
place->quick place ->place by property/value->right->place
room布局:可从PCB或SCH中设置room属性
PCB:edit->properties->find by name->comp(or pin)/name->more->选器件->apply->
room->value:power3v3->apply->show->ok
setup->outline->room outline->create
place->quick place->place by room->place->ok
SCH: 选器件(ctrl)->右键->property->cadence-allegro->room->右键edit->
current properties->apply
dsn->tools->create netlist
PCB->file->import logic->setup->outline->room outline......
一次调进所有元件
quick place:place->quickplace->place all components->around package keepin->right
关掉线属性->display->black rats->all
edit->move->find by name ->U6
常用命令:edit->move / mirror
干扰源:时钟,RAM(bus,高速)
LDO线性电源噪声小, 开关电源噪声大
平面去耦 管脚去耦
电容值越小越靠近管脚
排阻用于端接
1.去耦电容2.端接电阻
时钟走线 线比较宽
******************************************************************************************************
约束规则设置:setup->constraints
standard values
space->set values
physical(line/vias) rule set -> default
线变窄->neck 8mil精装线
设置过孔physical rule set
设置规则值:1设置约束规则setup->constraints
2设置网络属性名edit->property->find->net->more->apply->net physical type->apply
net spacing type
3网络赋值规则
电源20mil
特殊区域处理:setup->constraints->areas require a type property->add->
attach property->点shape->edit property窗口设置属性名->
网络赋值规则
布线:route->connect
设置规则:布线
建立总线:constraint Manager->Net->Routing->wiring
mcu->ram
mcu->flash 两者距离相等最好
在总线基础上建立拓布后,设置规则
拓扑约束:选择线->logic->net schedule->选择引脚->右键insert T
方法2.总线->右键sigx->在SigXplorer编辑连线->set constraint->wiring->template->verify->file update constraint manager
走线线长规则设置:sigx->set constraint->prop delay->from to length(max min)->add->update constraint manager
analyze ->analysis modes 打开拓布、线长显示
等长设置:蛇形走线 调整传播延时
sigx->set constraint->rel prop delay->
T性连接点后两段相等:new->T.1 - U7 local->length tolerance:500mil->add (T.1- U7 T.1 - U8)
mcu到器件:new->u6-U7 global->length:400mil->add
查看:net-》routing-》relative propagation
差分对设置:
constraint manager-》选线-》右键create differential pair
constraint manager-》net->routing-> differential Pair->设置 (phase tolerance 10mil 两线容忍误差)
方法2.logic->assign differential pair ->选线->添加
setup->constraints->electrical constraints->diffPair value->new->设置
assign->赋值
布线前准备47:
设置颜色:display->color->设置stack up、components、 manufacturing、geometry
屏蔽电源地线:edit->property->find name net->more->power ->apply->ratsnest_schedule->power_and_ground->apply
高亮显示:display->color ->display ->highlight设置颜色->display->highlight
setup->user preferences->display ->display_nohilitefont
drc: display drcfill
setup->draw options->display 设置DRC尺寸
飞线显示:display->show rats->all components nets
关闭:blank rats->all components nets
不同网络高亮不同颜色:display-》highlight-》find net ;option 选择高亮颜色->点击网络
BGA fan out48:route ->fanout by pick->find components->点选器件(电源地未fanout)
constraints->电源线宽属性去掉
右键setup->fanout->direction anywhere
布线:route->connect->option设置
设置过孔:setup->constrant->physical->via设置
布线方式50: 换层:双击/右键add via 、 swap layer
群组走线51:bus走线
route->connect
1.框选网络
2.右键temp group,逐个点击pin
线距:右键route space
动态显示延迟:setup->etch->allegro_dynam_timing on/ allegro_dynam_timing_fixedpos 确认
rdly相对延迟 dly延迟
当前走线长度:setup->etch->allegro_etch_length_on 确认
router->slide 修复走线
router->miter by pick 修正转角为45°
router->spread between voids让开过孔边界
router->gloss
差分对布线:53
T型走线:
蛇形走线:route ->delay tune -> trombone较好
覆铜55:shape->polygen 多边形 /rectanglar 矩形 /circular 圆形
shape->edit boundary
附网络:shape->select shape or void->点击铜皮->assign net->option 选择网络
手工挖空:shape->manual void->形状
删除孤岛:shape->delete islands
铜皮合并:shape->merge shapes
内电层分割:add->line-> option->anti etch ->power->width 40mil间距
edit->splite create->power
删除孤岛
布线完成后:
测试点57:
PCB编号:logic->auto rename refdes->rename->设置
原理图edit->back Annotate
查看:tools->report/quick reports:unconected pins report
数据库检查:tools->update DRC /db check
silkscreen58
drill 59
artwork60
内电层覆铜?????????????????
*****************************************************************************************************
***************丝印***************************************
silkscreen:关闭走线层,打开丝印层。
display->display and visibility->stack up->etch 关闭
asembly top/bottom off
manufacturing->autosilk_top/autosilk_bottom on
生成丝印:manufacture->silkscreen->package geometry:silk
reference designator:silk ->silkscreen
改变字体大小:edit->change->find:text->option:width 8 block 2->框选板子->右键done
调整位置:edit->move
添加文字:add->text->option:manufacturing:autosilk_top
***************钻孔文件***********************************
钻孔文件相关操作:drl
设置参数
manufacture->Nc->NC parameters->设置参数(默认) =》 nc_param.txt
生成文件:manufacture->NC->NC Drill:全通孔用layer pair 有盲孔by layer->drill =》 .drl
非圆孔处理:Manufacture->NC->NC route->route =》.rou
生成钻孔表和钻孔图(板上):display->all invisible-> board geometryutline on->apply
manufacture->NC->drill legend->ok
****************光绘文件****************************
光绘文件:manufacture->artwork->未定义线宽:6
Plot mode:正负片:positive
vector based pad behavior on
Gerber RS274x
加光绘边框(可选):setup->areas->photoplot outline->画框
添加silk_top
1.display->color visible->all invisible
board/package geometry:silkscreen top on on
manufacture:auto silk top on ->apply
2.manufacture->artwork->general parameters->film control
右键add->silkscreen_top-> OK
光绘文件层(四层):
电气层:bottom GND power Top
丝印层:Silkscreen_top silkscreen_bottom
阻焊层:soldermask_top solid_bottom
加焊层:pastemask_top pastemask_bottom
钻孔层:DRILL_DRAWING:manufacturing:nc legand-1-4
外框层:geometry outline
要修改各光绘层参量
注:右键点选光绘层,display显示该光绘层。
文件:.art .drl .out art_param.txt nc_param.txt |
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