LEF_EDGECAPACITANCE

spacings(
( LEF_EDGECAPACITANCE tx_layer
 f_edgeCap
)

) ;spacings

Specifies a floating-point value of peripheral capacitance, in picofarads per micron. The place-and-route tool uses this value in these situations:

Estimating capacitance before routing.
Calculating segment capacitance after routing. The tool uses the value only if you set the layer thickness or layer height to 0. The following formula is used:
```
(layer capacitance per square x segment width x segment length) + (peripheral capacitance x 2 (segment width + segment length))
```

tx_layer

The layer on which the constraint is applied.

Type: String (layer and purpose names) or Integer (layer number)

f_edgeCap

The required edge capacitance.

None.

The edge capacitance on Metal1 is 0.0000883.

spacings(
    ( LEF_EDGECAPACITANCE "Metal1"  
     0.0000883 
 )
) ;spacings

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