Working with IEEE Symbol Objects on a Schematic Library Sheet in Altium Designer
Parent page: Schematic Objects
Summary
IEEE symbols are non-electrical drawing primitives. They are used for representing logic functions or devices. These symbols enable users to understand the logic characteristics of these functions or devices without requiring specific knowledge of their internal characteristics.
Availability
IEEE Symbol objects are available for placement in the Schematic Library Editor only. A total of 34 symbols are available, the associated placement commands for which are located:
- On the Place » IEEE Symbols main menu.
- On the IEEE Symbols drop-down () of the Utilities toolbar.
- On the Place » IEEE Symbols right-click workspace context menu.
Placement
After launching a command, the cursor will change to a cross-hair and you will enter IEEE symbol placement mode. The chosen IEEE symbol will appear "floating" on the cursor.
- Position the object and click or press Enter to effect placement.
- Continue placing further symbols, or right-click or press Esc to exit placement mode.
Additional actions that can be performed during placement are:
- Press the Tab key to access an associated properties dialog, from where properties for the symbol can be changed on-the-fly.
- Press the Alt key to constrain the direction of movement to the horizontal or vertical axis, depending on the initial direction of movement.
- Press the Spacebar to rotate the symbol anti-clockwise or Shift+Spacebar for clockwise rotation. Rotation is in steps of 90°.
- Press the X or Y keys to mirror the symbol along the X-axis or Y-axis respectively.
- Press the + or - keys (on the numeric keypad) to enlarge or shrink the symbol.
Graphical Editing
This method of editing allows you to select a placed IEEE symbol object directly in the workspace and change its location or orientation, graphically. IEEE symbols are fixed with respect to their shape and can be resized only through use of the relevant keyboard shortcuts. As such, editing handles are not available when the IEEE symbol object is selected:
- Click anywhere inside the dashed box and drag to reposition the symbol as required. While dragging, the symbol can be rotated (Spacebar/Shift+Spacebar), mirrored (X or Y keys to mirror along the X-axis or Y-axis respectively), or resized (+/- keys on numeric keypad).
Non-Graphical Editing
The following methods of non-graphical editing are available:
Via an Associated Properties Dialog
Dialog page: IEEE Symbol
This method of editing uses the IEEE Symbol dialog to modify the properties of an IEEE symbol object.
The IEEE Symbol dialog can be accessed prior to entering placement mode, from the Schematic – Default Primitives page of the Preferences dialog. This allows the default properties for the IEEE Symbol object to be changed, which will be applied when placing subsequent IEEE Symbols.
During placement, the dialog can be accessed by pressing the Tab key.
After placement, the dialog can be accessed in one of the following ways:
- Double-clicking on a placed IEEE symbol object.
- Placing the cursor over a IEEE symbol object, right-clicking and choosing Properties from the context menu.
- Using the Edit » Change command and clicking once over a placed IEEE Symbol object.
Via the SCHLIB Inspector Panel
Panel pages: SCHLIB Inspector, SCHLIB Filter
The SCHLIB Inspector panel enables the designer to interrogate and edit the properties of one or more design objects in the active document. Used in conjunction with appropriate filtering - by using the SCHLIB Filter panel, or the Find Similar Objects dialog - the panel can be used to make changes to multiple objects of the same kind, from one convenient location.
Via the SCHLIB List Panel
Panel pages: SCHLIB List, SCHLIB Filter
The SCHLIB List panel allows the designer to display design objects from one or more documents in tabular format, enabling quick inspection and modification of object attributes. Used in conjunction with appropriate filtering - by using the SCHLIB Filter panel, or the Find Similar Objects dialog - it enables the display of just those objects falling under the scope of the active filter – allowing the designer to target and edit multiple design objects with greater accuracy and efficiency.