EDWinXP Symbol Library Check list
- Use EDWinXP naming convention (eg ADC1241 for Analog to Digital converter ADS1241E)
- Symbol and Entry should be placed on grid 2.54 mm
- Width-Height ratio of the symbol should preferably be 1:3.
- Pin length should be 5.08mm
- Space between consecutive pin should be 2.54mm
- Symbol description should be meaningful as given in datasheet
- Orientation of entries
- In all cases regardless of symbol size & shape, the 1st entry should be on the top left corner.
- Positioning of Pins
- All inputs should be on the left side and outputs on the right side of the symbol.
- For very big symbols having inputs 2/3 of all pins, inputs may be placed in three sides of the symbol starting from top left corner and ending at top right corner
- For very big symbols having outputs 2/3 of all pins, we can keep inputs and control pins in the left side and outputs starting from bottom left and ending at top left of the symbol.
- Positioning of Supply Pins
- (a) For rectangles using only two sides
+Ve supply pin should be on top right corner , –Ve supply pin should be on bottom right corner and GND pin should be on bottom left corner of rectangle - (b) For rectangles using all sides
+ve power supply (+Vcc) pins should be on top side and -ve power supply (-Vcc) should be on the bottom side of the rectangle ,GND should be on the bottom left side of the rectangle - (c) For symbols using other graphic items
In all other cases +ve power supply pins should be on top side and -ve power supply should be on the bottom of the symbol.
- ENTRY ATTRIBUTE Entry attribute should be the name of the pin. For negated signal conditions, a TILDE (~) should be used before the name of the pin.
- REPRESENTATION OF NEGATED SIGNALS USING BUBBLES AND BAR
- TEXT SIZE & TEXT PITCH The size of all texts including COMPNAME and COMPDESC should preferably be 60 mil. The pitch of text should be 24 mil.
- TEXT POSITION Texts should be placed within the symbol and 20 mil away (left / right / top / bottom) from the boundary of the symbol.
- PA SHIFT PA shift should be placed 20 mil to the right/left and 20 mil to the top/bottom of the entry.
- LINE SIZE The line size (thickness) of all graphic items should be 8 mil