Altium Designer Documentation

Sheet Entry

Modified by Rob Evans on Jun 19, 2017

The Sheet Entry dialog.

Summary

This dialog allows the designer to specify the properties of a Sheet Entry object. A sheet entry is an electrical design primitive that belongs within a sheet symbol (and device sheet symbol and managed sheet instance symbol). It is placed within a sheet symbol to designate input/output ports for the symbol. The sheet entries correspond to ports placed in the source schematic sub-sheet that the symbol represents.

For information on how a placed sheet entry object can be modified graphically, directly in the workspace, see Graphical Editing.

Access

The Sheet Entry dialog can be accessed prior to entering placement mode, from the Schematic - Default Primitives page of the Preferences dialog (Tools » Schematic Preferences). This allows you to change the default properties for the sheet entry object, which will be applied when placing subsequent sheet entries.

During placement, the dialog can be accessed by pressing the Tab key (while the sheet entry is still floating on the cursor, and while it is within the bounds of a sheet symbol).

While attributes can be modified during placement, bear in mind that these will become the default settings for further placement unless the Permanent option on the Schematic – Default Primitives page of the Preferences dialog is enabled. When this option is enabled, changes made will affect only the object being placed and subsequent objects placed during the same placement session.

After placement, the dialog can be accessed in one of the following ways:

  • Double-clicking on the placed sheet entry object.
  • Placing the cursor over the sheet entry object, right-clicking and choosing Properties from the context menu.
  • Using the Edit » Change command and clicking once over the placed sheet entry object.

Options/Controls

  • Fill Color - click the color sample to change the fill color for the sheet entry, using the standard Choose Color dialog.
  • Text Color - click the color sample to change the text color for the sheet entry, using the standard Choose Color dialog.
  • Side - use this field to specify where the sheet entry is positioned, in relation to the parent sheet symbol. Available options are: Left, Right, Top, and Bottom.
  • Style - use this field to manually control the style of the sheet entry, when the I/O Type is set to Unspecified. The style is essentially the direction in which the entry 'points'. Available options are: None (Horizontal), Left, Right, Left & Right, None (Vertical), Top, Bottom, Top & Bottom.
If the I/O Type is set to Input, Output, or Bidirectional, then this field will override any manual setting specified in the Style field.
  • Kind - use this field to control the graphical arrow style for the sheet entry. Available options are: Block & Triangle, Triangle, Arrow, and Arrow Tail.
The direction of the arrow is determined by the setting for the I/O Type, unless Unspecified is chosen as the type, in which case the arrow direction will follow the Style setting.
  • Text Style - use this field to determine how the text for the sheet entry is displayed, when bus syntax is used. Choose from the following options:
    • Full - choose this option to display the net identifier information in full. For example the N[0..7] net identifier string will be shown as N[0..7].
    • Prefix - choose this option to display only the prefix of the net identifier, ignoring the bracketed portion. For example the N[0..7] net identifier string will be shown as N.
  • Text Font - this control serves two purposes. Firstly, it reflects the currently chosen font for the text in terms of Font Name, Font Size and Font Style. Secondly, when clicked it provides access to the standard Font dialog, from where to change the font as required.
Effects are also displayed when enabled (Strikeout, Underline). If Regular is used for the font's style, this will not be displayed visually in the control's string.
  • Border Color - click the color sample to change the outline color for the sheet entry, using the standard Choose Color dialog.

Properties

  • Name - the current name of the sheet entry. The entry in this field defines the connectivity of the sheet entry. A sheet entry connects electrically to a port on the sub-sheet below with the same name. Enter the name directly, or use the field's drop-down list to choose a name from all existing port names on the sub-sheet referenced by the parent sheet symbol.
Should you need to negate (include a bar over the top of) the harness entry name, include a backslash character after each character in the name (e.g. E\N\A\B\L\E\). Alternatively, enable the Single '\' Negation option on the Schematic- Graphical Editing page of the Preferences dialog, then include one backslash character at the start of the name (e.g. \ENABLE).
  • Position - the current position of the sheet entry in relation to the top edge of the sheet symbol (when placed along the left or right edges), or left edge of the sheet symbol (when placed along the top or bottom edges). Enter a greater value to move the sheet entry further down, or right, respectively.
  • Harness Type - this field is used to provide the connectivity between the sheet entry and a defined signal harness system, allowing a collection of signals to be transferred between sheets in the design hierarchy. The Harness Type itself is defined either manually in the associated Harness Definition File, or as part of the properties of a Harness Connector. The associated drop-down lists all currently defined Harness Types detected across the source schematic documents of the active project.
When a defined Harness Type is entered in this field, the color of the sheet entry will automatically change to match that of the applicable Harness, and the sheet entry's I/O Type will change to Unspecified (and become read-only).
When the sheet entry is physically connected to a Harness Connector - either directly, or via a signal harness - it will automatically inherit that harness's type. The Harness Type field will populate with that harness's type, and become read-only.
  • I/O Type - defines the electrical properties of the sheet entry. Select an option from the drop-down list. Available options are: Unspecified, Output, Input, and Bidirectional.
The setting of this field does not influence the connectivity of the circuit, but is considered during the running of an electrical rules check, which can be set to detect incompatible sheet entry directions.
If the I/O Type is set to Input, Output, or Bidirectional, then this field will override any manual setting specified in the Style field.
  • Locked - enable this option to protect the sheet entry from being edited graphically.
If attempting to graphically modify an object that has its Locked property enabled, a dialog will appear asking for confirmation to proceed with the edit. If the Protect Locked Objects option is enabled on the Schematic – Graphical Editing page of the Preferences dialog, and the Locked option for that design object is enabled as well, then that object cannot be selected or graphically edited. Double click on the locked object directly and disable the Locked property, or disable the Protect Locked Objects option, to graphically edit the object.
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