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2025-01-19 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Internet Technology >
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This article mainly explains "what are the skills for using Allegro". Friends who are interested may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "what are the skills for using Allegro?"
1. Mouse setting: in the ALLEGRO window LAYOUT, each execution of an instruction: Add connect, Show element and other mouse will jump to the Option window, which causes inconvenience to layout.
In the control panel > mouse move options, refer to the default button (or smart move): cancel the move mouse pointer to the default button setting in the dialog box
2. Text path setting: some instructions cannot be executed in ALLEGRO window LAYOUT: Show element, Tools > report.
Emergency solution: find a corresponding log document copy to the same path to the file.
The Design_Paths > textpath item of Setup > User Preference is set to: C:cadancePSD_14.1sharepcb/text/views.
3. Cannot edit Net Logic.
Select logic_edit_enabled for Setup > User Perference, click to allow editing of Net Logic, and default to not edit Net Logic.
4. Update DRC is required before switching to gerber. DRC should be excluded as far as possible. How to eliminate some negligible DRC?
The error generated by logo Chinese characters can add an additional subclass, so that the text does not have to be written on the ETCH layer, and can eliminate K Maple L error.
There are some negligible error of Pmax PMAG L, which can add a property-NO_DRC to those pin. Operation: Edit/Properties, select the desired pin, select NO_DRC, Apply, OK
5. The attribute "NO DRC" has been added to some PIN, but ERRO cannot be eliminated. Why?
The "NO DRC" attribute is only for different networks. If you want to clear ERRO for the same network, you can set Same net DRC to off.
6. How to Add new subclass:
Select Class in the Define Subclass window of Setup > Subclass, and the new subclass commonly used in clicking add "New subclass" are: Top_notes of GeometryBoard Geometry, Bottom_notes, Gnd_notes, Vcc_notes, etc. Its function is the layer placed by the Title/Page name of Log in gerber.
7. How to set the "net space type" properties of differential pair nets?
First set a differential pair property for net
Then select the attach property nets of the spacing rule nets bar in the constraints system control panel, and select property under the find by name of the allegro window control panel
Select the appropriate property
Then apply spacing rule to it.
8. Two different display modes in Hilight (solid line and dashed line)
In setup > user preferences > display, check display_nohilitefont and display it as solid line. If unchecked, dashed line is displayed. Solid line is easier to see.
9. How to update tool bar and display option settings under the Allegro layout window
In View > customization > tool bar, check what you want to display in the window; to lock the right display option window, select locked_right in view > customization > display option. This will restore the previous settings when you reopen an ALLEGRO window.
10. The Color and Visibility window is too long. Some people will find that the Color and Visibility window is too long to close it after using it for a while. There are two ways to solve this problem.
Close the Allegro program and delete the allegro.geo in the pcbenv path, and then enter Allegro to reset its window
Change the value of Form.cvf_main in Allegro.geo file to 60 400 0 430
11. When opening allegro, the allegro.jrl file will be automatically generated on the desktop. How to solve this problem? What's possible: the temp path is set to the desktop in the environment variable
Temp should be set to:% USERPROFILE%Local SettingsTemp in the environment variable
The Design_Paths > textpath item of Setup > User Perference is set to the desktop
twelve。 When we asked for RENAME back components, it was not successful.
Select Edit/property, select all components on the back (select component in FIND), assign an auto_rename attribute, and then rename again.
13. Rename
Setup/user preference editor/misc/fst_ref_des can be set to a value such as 501, which means that the element Rename starts from 501, such as C501, R501, and so on.
14. We often encounter this problem when we are on the line. When we are on the line, we are eager for the RATS display to change with the line so that it can be routed. Ratsnest Points in Setup/Drawing options's Display has two options:
Pin to Pin (Rats appears between Pin)
Closest end point (Rats display changes with alignment)
15. How to copy multiple regular VIA
Point COPY enter the number of VIA in the right command bar XQuery Y, and the distance between PIN and PIN shall be the standard.
16. Sometimes when you open the allegro window, the menu will turn out to be invalid.
Delete the men document that is not under the system path (c:cadencepsd_14.1sharepcbextcuimenus), and then update the men document under the system path
Reopen an allegro window.
17. Use of Stroke
Setup > User Preferences... > UI:no_dragpopup, if you select the right button to draw stroke graphics, you can achieve the shortcut function. The default state is that you need to use the CTRL+ right button to achieve the Stroke function 18. How to put Help file and executable programs on Allegro Menu?
1) change the * .men file under LayoutserverFUserg47Menu File under Copy to: C:CadencePSD_14.1SharePcbTextcuimenus
2) under Help file Copy to C:CadencePSD_14.1SharePcbHelp under Pcb_server2PcblHelp File. The Help file added to it can be executed.
19. Path settings for Menu.
Select menupath for Ui_paths of Setup > User Preferences. The default Path is the current path and C:CadencePSD_14.1SharePcbTextcuimenus. When you want to change Menu, it is recommended to add a new Menu path to prevent damage to the Menu of the system.
20. Retention of shortcut keys in env
Put the alias item in the env file under C:Pcbenv in the env file under Copy to: C:CadencePSD_14.1SharePcbText. You can keep your shortcut key settings in env.
21. During SUB_DRAWING, the same content has two same names, and sometimes it cannot be opened.
The CLIPPATH path under SETUP/ sets only the current path and removes the rest.
twenty-two。 Define that a certain area cannot have a test point.
Add a piece of SHAPE to the Manufaturing/no_probe_bottom layer. When using Route/Testprep/create Probe to create the test point in this area, it will fail, and the hint is: Pin out of bounds.
23. The pad in Allegro Lib has been changed, but the window replace that is making the part cannot update the pad, even if the pad is deleted and called back in.
Write down the coordinates of the pad first, and then delete the pad.
Choose toos/PADStack/modify design PADStack... Select purge/all in the pop-up window, select yes in the pop-up window, and then re-call the pad to ok.
24. For signals such as VCC,GND, which require higher linewidth, it is easy to generate line to line errors when walking these signals on relatively small pin feet and denser IC. If you simply change the linewidth to a smaller size, it will also generate line to line errors.
When setting the rule of these signals, under physical (line/vais) rule set etch value under constrain system master, set min line width to the linewidth of VCC, GND and other signals.
Min neck width is set to the linewidth that a special IC can walk.
Max neck length sets how long the reduced width of the line can go.
Then put this rule on these signals. In the future, when running the line, you can change the linewidth of the VCC,GND and other signals on the special IC to the min neck width value just set without error.
25. PAD cannot be placed when making a part
It may be the option bar of the display window on the right: the numbers of Inc and Text block items are zero, and you can change them to natural numbers.
twenty-six。 When making Goldfinger parts, REF* and other five items are placed (Assembly_Top OR Assembly_Bottom)
When the two sides of the gold finger are made into the same part, the five items such as REF* are only placed in the Assemble_top layer.
When the two sides of the gold finger are separated to make two parts, for the parts of the Top layer, the REF* and other five items are placed on the Assembly_Top layer, and for the parts of the Bottom layer, the REF* and other five contents are placed on the Assembly_ bottom layer.
twenty-seven。 Replace different packaged parts in board file?
First add an attribute to the part to be replace-Edit/Property, select temporary package symbol, apply.
Execute the instruction again: place/replace SPECCTRAQuest Temporary/symbol. The parts of Replace should be the same as the original pin count of temporary symbol.
twenty-eight。 When you open the Allegro window, wait a long time and prompt Function in the command window that it cannot find information.
Drop the uncommonly used skill file delete under Pcbenv, and delete the corresponding Load "* .il" line in the Allegro.ilint file.
twenty-nine。 The Z_COPY command cannot be used in shape symbol and flash symbol formats.
In setup > drawing size > type to change the working format to a format that can use Z_COPY, and then change it back. Can save the tedious subdrawing.
thirty。 How to protect your Project.
Editor of Allegro Design Expert in Allegro14.2. File > Properties Select Password. Enter your password and check the Disable export of design data entry so that your Project will not be stolen.
thirty-one。 Dbfix instructions cannot be executed in Allegro14.2.
Dbfix is the program used for Repair errors in Allegro14.1, and the functions of these Check& Repair errors are concentrated in DB Doctor in Allegro14.2. DB Doctor can Check& Repair various types of errors it supports various types of layout file formats, such as * .brd * .mcm * .mdd * .dra * .psm * .sav * .scf. But it is not sure to complete all the errors of repair.
thirty-two。 Introduction of Allegro Utilities**** program
Allegro to SPECCTRA: SPECCTRA Automatic Router
Batch DRC: remove the DRC marks in the board, only remove the mark. If you want to layout, you need Run Update DRC.
thirty-three。 How to avoid adding the measuring point to the part of the Bottom layer.
In general, the measuring points are added to the Bottom layer, that is, layer selects Bottom. Route > Testprep > Auto when running additional test points. Do not check Allow under component, the computer will automatically detect whether there are any points in the part according to the Assembly of the part. The drop point that has been added to the part will not be valid.
thirty-four。 How to one-time highlight net without adding test points
Method 1: after running Route > Testprep > Auto... After that, highlight all the net, then turn on only Manufacturing > PROBE_BOTTOM, then select the box to dehilight all the net, and then open the desired layer, and the remaining highlight net is the net without adding test points.
Method 2: after running Route > Testprep > Auto... After that, type hl_npt on the Allegro command line to one-time highlight net without adding test points. The premise is... There is hl_npt.il skill file under pcbenv.
thirty-five。 The use of CRTL key in Allegro.
When executing the Temp Group of multi-selected instructions one by one, such as Hilight and other commands, pressing and holding the Hilight key can realize the function of reverse selection, that is, pressing the CRTL key is Dehilight when executing the CRTL key, and pressing the CRTL key to cancel the selection when executing the Temp Group of other commands.
thirty-six。 Generate a list file through the report file of show element.
If the target net or symbol etc is selected in the Display > Show element box, a Report window is generated and saved as a txt file, that is, a list file. This list file can be used for a set of lines in Hilight and a set of symbol in Delete, which is more flexible than setting Group or finalizing Bus name.
thirty-seven。 Dock Report windows to display multiple Report windows
Select File > Stick in the Report window, and the window can be docked. When the Report instruction is executed, the window will not be overwritten.
thirty-eight。 The setting of zooming in and out of the middle key
Setup > User Preferences... > Display: no_dynamic_zoom. If checked, only one-time Zoom window is allowed when you click the middle button. By default, you can click the middle button to zoom the window at will.
thirty-nine。 Manhattan etch length is not displayed on Show element
Setup > User Preferences... > UI: show_max_manhattan_pins does not display manhattan etch length when you enter Key 1 in the Value column to Show element. This setting is not applicable to net with NO_RAT attribute.
In general, for net over 50 pins, such as power net such as GND, manhattan etch length is not displayed when Show element.
forty。 Manufacture of non-electric pin parts
Build a circular drill hole:
(1) parameter: no electrical properties (non-plated).
(2) layer: only the top and bottom regular pad need to be set, and the middle layer, solder resistance layer and additional solder layer are all needed.
Note: regular pad is a little bigger than drill hole.
41.Allegro defines cascading structure
For the simplest four-layer board, you only need to add the power layer and the bottom layer, as follows:
1. Setup-> cross-section
2. Add layer, power layer and stratum should be set to plane, at the same time, dielectrics should be added between the layers, usually FR-4.
3. Specify that the power layer and stratum are both negative (negtive).
4. After the setting is completed, you can see two more layers in Visibility: GND and POWER.
5. Laying copper (can be done after layout)
6. Z-copy-> find panel Select shape (because the laying copper is shape)-> copy to class/subclass of option panel Select ETCH/GND (pay attention to create dynamic shape) to complete GND cladding
7. The copper cladding of POWER layer is completed by the same method.
42.Allegro generates Netlist
1. Regenerate the index number: tools-> annotate
2. DRC check: tools-> Design Rules Check to view session log.
3. Generate a Netlist: tools-> create netlist. The generated Netlist will be saved to the allegro folder. You can take a look at the session log content.
Allegro imports Netlist
1. File-> import-> logic-> design entry CIS (here are some options to set the impact of importing Netlist on the current design)
2. Select the Netlist path in the allegro folder.
3. Click Import Cadence to import the Netlist.
4. After importing the Netlist, you can select place-> may-> placement list to select components by refdes to view the imported components.
5. Set grid points, one set for all non-electric layers and one set for all electric layers. Note that non-electrical grid points are used to manually place components.
6. Setting the drawing option,status option will show the number of unplaced components and the number of networks without cabling.
43.Allegro manual placement of components
1. Place-> may-> components by refdes can see the components in the project, which can be filtered by selection filters. In addition, you can also manually place the components in the library. You can also hide the dialog box and right-click-> show to display it.
2. How to mirror the image to the bottom layer?
Method 1: first select mirror in option, then select device
Method 2: select the device first, then right-click-> mirror
Method 3: setup-> drawing option-> Select mirror to make global settings
Method 4: for the placed parts, Edit-> mirror select symbol in the find panel, and then select the components so that they will automatically be at the bottom after placing the components.
3. How to rotate?
Method 1: for the components that have been placed, Edit-> move click on the component, and then right-> rotate can rotate method 2: rotate when placed, select rotate in the option panel
44.Allegro quick placement element
1. Element placement: place-> quickplace-> place all components
2. How to turn off and open the flying line?
Turn off flying lines: Display-> Blank Rats-> All close all flying lines
Open flying lines: Display-> Show Rats-> All open all flying lines
3. Find the device quickly: Find panel-> Find By Name-> enter the name
forty-five。 Summary of the settings of constraint rules
1, constraint settings: setup-> constrains-> set standard values can set line width, line spacing. Spacing includes: pin to pin, line to pin, line to line, etc.
2. Mainly use spacing rule set and physical rule set
forty-six。 Specific method of setting constraint rules
1. When setting up, pay attention to selecting Default in Constrain Set Name. In this way, as long as there is no specially designated network, it is in accordance with this rule.
2. General setting rules: pin to pin is 6mil, others are 8mil.
3. Set the maximum linewidth, minimum linewidth, neck in Phsical Rule, differential pair setting (the priority set here is relatively low, you can ignore it, etc.), the position of T-shaped connection, and specify the through hole.
4. Add a lineweight constraint: first add a Constrain Set Name, which corresponds to a specific network.
forty-seven。 Regional rule settin
1. Set the rules for specific areas, for example, for the pin of the BGA device, you need to set the line width to be narrower and the line spacing to be narrower.
2. Setup-> constraints-> constraint areas-> Select arears require a TYPE property-> add to see that the class/subclass of the options panel is Board Geometry/Constraint_Area-> draw a rectangle in the specified area-> click on the rectangle, and call up edit property-> specify the spacing (net spacing type) and lineweight (net physical type)-> specify the assignment table.
At this point, I believe you have a deeper understanding of "what are the skills for the use of Allegro?" you might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!
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