Name of the layer not to be penetrated by the backdrill.
Values
<Free text> (0 - 64 characters)
The ohmic resistance of the semiconductor material.
Values
0.0 - 10000 nano_ohm
The typical characteristic impedance (in ohms) required for a layer.
Values
0.0 - 10000.0 ohm
Default Value
0 ohm
Use for general textual comments.
Values
<Free text> (0 - 500 characters)
The weight of copper according to its units of measure.
This layer attribute reflects the density of the copper used. Copper Weight is measured in ounces per square feet.
Copper Weight is calculated as <layer_thickness> / <copper_weight>.
The value defined in EDA data for each layer. Each format may define this value using a proprietary keyword or field.
The layer thickness value divided by the value of the configuration parameter copper_weight (default value = 1.35). This value reflects the density of the copper used.
Depending on the measurement units to which the display is set, the value of the layer attribute Copper Weight stored in the ODB++ product model may differ from the value displayed in the Job Matrix window.
Measurement Units |
Display Formula |
|---|---|
Imperial |
The value is rounded to the nearest 0.5 oz/ft^2.
|
Metric |
The value is displayed as is. |
These examples use Cadence Allegro data with display in imperial units:
S!001!TOP!POSITIVE!!YES!1!341000.000000 mho/cm!1/1OZ_PLTD_CU_FOIL!NO!0.0921 w/cm-degC!1.600000 mil!CONDUCTOR!0!
In the layer TOP, LAYER_THICKNESS = 1.6mil.
This is divided by 1.35 to obtain a Copper Weight of 1.18519 oz/ft^2. This is the value stored in ODB++.
For display, this is rounded to the nearest 0.5 oz, giving a value of 1.0 oz/ft^2. Since the difference between 1.18 and 1.0 is <0.2, the copper weight value displayed is 1.
S!011!BOTTOM!POSITIVE!!YES!1!580000.000000 mho/cm!2OZ_COPPER!NO!0.0911 w/cm-degC!2.400000 mil!CONDUCTOR!0!
In the layer BOTTOM, LAYER_THICKNESS = 2.4mil.
This is divided by 1.35 to obtain a Copper Weight of 1.7777 oz/ft^2. This is the value stored in ODB++.
For display, this is rounded to the nearest 0.5, giving a value of 2.0 oz/ft^2. Since the difference between 1.77778 and 2 is >0.2, the copper weight value is rounded for display to two decimal points = 1.78.
The ratio of the field without dielectric (Eo) to the net field (E) with dielectric. It is unitless and has a range value of 1 for metals. Typical values are 4 and 5.
Values
0.0 - 1000.0
Default Value
0
Applies to layers of type DIELECTRIC or SOLDERMASK in the layer matrix that contains the thickness of material according to its specified units of measure.
Values
0.0 - 0.5
Default Value
0
Indicates whether the via holes created by a drill layer are filled (rather than plated). This attribute is only suitable for drill layers.
Values
yes | no
Default Value
no
Assigns a technology type attribute to an embedded components layer.
Values
none | additive | subtractive
Default Value
none
Type of HDI assembly technology identified in the product model. If None, the special layer is not created.
Values
none | wirebond | flipchip | hybrid
Default Value
none
An attribute added to a copper layer—not a dielectric layer—to distinguish buildup layers from core layers in HDI product models.
Values
buildup | core
Default Value
buildup
Test width of routes used for the provided impedance result.
Values
-2147483648.0 - 2147483648.0 ml
Default Value
0 ml
The parameter of a dielectric material that quantifies its inherent dissipation of electromagnetic energy.
Values
0 - 100
Default Value
0