# mxpic_EDA
The EDA coding for the layout for optihk
# requirements
flask

# Frontend - backend GDS bridge
Each canvas in the fronend should create a same name **.yaml** file.
This **.yaml** should contain the following parts.

- basic description : name, type, version
- ports : the output connection ports for this canvas object
- instances : the instance objects from **PDK** or other **canvas**, together with their **x, y, a, mirror** informations.
- bundles : 1-1 or N-N conenctions that used for auto routing. "***This***"  refers to the canvas ports. 

```
[ Project Canvas ]
     │  (Contains instances of Component A and Component B)
     ▼
[ Component A Canvas ]
     │  (Contains instances of DC_2x2 and Ubend)
     ▼
[ PDK Primitives ] ──> (Loads raw .gds + physical port data .yml)
```

``` yaml
# ==========================================
# mxPIC Cell/Project Definition File
# ==========================================
name: MMI_Splitter_Module # Name of this cell/component/project
type: composite          # "primitive" (PDK base) or "composite" (hierarchical)
version: "1.0.0"

# 1. External Ports (How this cell connects to the outside world)
ports:
  - name: in0
    layer: WG_CORE
    x: 0.0
    y: 0.0
    angle: 180.0
    width: 0.5
  - name: out0
    layer: WG_CORE
    x: 100.0
    y: 10.0
    angle: 0.0
    width: 0.5
  - name: out1
    layer: WG_CORE
    x: 100.0
    y: -10.0
    angle: 0.0
    width: 0.5

# 2. Instances (The sub-components dropped onto this canvas)
instances:
  mmi_inst1:
    component: MMI_2x2     # References another PDK cell or composite YAML
    x: 20.0                 # Placement origin X
    y: 0.0                 # Placement origin Y
    rotation: 0.0          # Rotation angle in degrees
    mirror: false          # True/False for layout mirroring
    settings:              # Local parameter overrides if parametric
      length: 25.5
      
  ubend_top:
    component: Ubend
    x: 60.0
    y: 5.0
    rotation: 0.0
    mirror: false

  ubend_bottom:
    component: Ubend
    x: 60.0
    y: -5.0
    rotation: 0.0
    mirror: true           # Flipped for symmetrical routing

# 3. Bundles (Grouped links for multi-bus/parallel routing)
bundles:
  output_bus:
    routing_type: euler_bend # Metadata for the backend router
    links:
      - from: ubend_top:out0
        to: this:out0
      - from: ubend_bottom:out0
        to: this:out1
```