pdaElasticData

Set the value for "elastic BB" like connector elements.
The properties are obtained from the schematic driven layout approach, where the layout software makes sure all things are connected properly. For this to work, it is often needed that some parts of the design are specified by the designer to be "elastic". Such elastic properties depend on the type of routing element that is used.
For example if a straight waveguide is used for routing, only the length is flexible. For a sine-bend shape both length and offset can be flexible.

This information is key for the circuit simulation / designer in a post-layout verification of the pre-layout simulations as the actual properties of the elastic building blocks may change their optical/electrical behaviour somewhat.

Structure

This element does not have elements. The attributes are shown below, in a sorted per type fashion.

XSD

The schema file can be downloaded or viewed at xPDK_Netlist.

Details

Type pdaNamedValue

Type pdaValue

none, and value is the expression in the content. The difference with attributes is that they are more like annotation; basically key/value string to add more information in a software specified way.

Type pdaValueDouble

degrees for angles. The expression is in the content.

Type pdaExpression

Expression need to be commonly evaluated by many software, so having a restricted set of math / types and so on is key. In PDAFlow lib2/expr there is a yacc/lex parser available with some unit support as well as double / complex expressions. An alternative is tinyexpr, but this is more restrictive, so may be very unhandy for things like waveguide model expressions.

name

Type pdaIdentifier documentation:
Identifiers are used in the Python library for the getName() and


        setName()

function and can thus be used to identify the different elements in list s.
In text the specification is a letter, followed by letters, numbers, underscore or dot. The XSD schema validation is a regular expression: [A-Za-z]([A-Za-z0-9_])*

allowedValues

Type pdaStringList documentation: text (attribute or element).

type

Type pdaValueType documentation: expression is an extension to what the 'simple code' can do, but runs partly in xPDK:expr spt.
Allowed types:

boolean:
int: xPDK:expr supported
unsigned: xPDK:expr supported
double: xPDK:expr supported
string:
point: xPDK:expr supported
complex: xPDK:expr supported

unit

Type pdaUnit documentation:
The use of units is strongly recommended to ensure that values are consistent between provider and user of data. The XSD schema allows a series of "basic units" with a * and / them. A basic unit uses the standard prefixes qryzafpnumckMGTPEZYRQ followed by its type and an optional ^. So a unit can be something like 1/cm*3kV/m^3/degree*dB
A few additional names are added. You can use them with the common prefixes.

Loss: dB/cm
bps: byte/second
degC: temperature in degree Celcius
degree or deg: angle in degree (0-360)
radian or rad: angle in radians (0-2PI)
dB: Decibel
eV: Electron Volt (no prefix)
none: No type / dimensionless value (no prefix)

doc

Type pdaDocumentation documentation:
This field allows some (short, few lines) documentation to be written. It can be a long string, but the idea is not to replace a design manual.
This fields is like tex which allows documentation in LaTex format; doc is restricted to plain text.

max

rule checking or user interface aspects. Type pdaExpression documentation:
Expression need to be commonly evaluated by many software, so having a restricted set of math / types and so on is key. In PDAFlow lib2/expr there is a yacc/lex parser available with some unit support as well as double / complex expressions. An alternative is tinyexpr, but this is more restrictive, so may be very unhandy for things like waveguide model expressions.

min

tex

Type pdaTexDocumentation documentation: