Specifications

102 Chapter 6—Primitive Devices
Pin Inversions
The logic of any pin on any device can be inverted by placing a non–empty
value in the Invert.Pin attribute field of the pin.
For example, to create the following AND gate with one inverted pin:
...the following steps must be taken in the DevEditor tool:
 Create the desired graphic symbol using the DevEditor’s drawing
tools.
 Place the three pins as shown. Order is important! All primitive
devices must have a specific pin order. For gates, all inputs come first
and the output pin last.
 In the Pin Name List at left, double–click on the last pin (the output
pin). This will display the Pin Information Palette for that pin.
 Set the pin type to Output. If desired, edit the pin name.
 Press the key to move to the next pin. You may use this
technique to edit the other pin names (if desired) and to check that they
are all set to Input.
 Close the Pin Information Palette.
 In the New Pin list, click once to select the input pin that is to be
inverted. Then select the Pin Attributes command, which is located on
the Options menu.
 Select the Invert.Pin field in the Attributes Dialog.
 Enter the value “1” for this field, then click Done. (The actual value
doesn’t matter, as long as it is non–empty.)
 Select the Subcircuit / Part Type command on the Options menu.
 Click on the Set to Primitive Type button, then select the AND
primitive type in the drop–down list.
LW Reference.bk Page 102 Monday, December 15, 2003 5:59 PM