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
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。