Interconnect Queries

This lesson covers three queries for extracting connectivity information from AP 210 data.

Query 1: List All Nets

Goal: Get all net names and the number of connection points on each.

Algorithm:

FOR EACH pcd IN Physical_Connectivity_Definition
  elements = FIND Physical_Connectivity_Element WHERE parent = pcd
  COLLECT {net: pcd.name, pin_count: SIZEOF(elements)}
END

Starting point: PHYSICAL_CONNECTIVITY_DEFINITION

Output:

[
  {net: "VCC", pin_count: 15},
  {net: "GND", pin_count: 22},
  {net: "SDA", pin_count: 2},
  {net: "SCL", pin_count: 2}
]

Query 2: Find All Pins on a Net

Goal: Given a net name, find all component pins connected to it.

Algorithm:

FOR EACH pcd IN Physical_Connectivity_Definition
  WHERE pcd.name = target_net_name
  FOR EACH pce IN Physical_Connectivity_Element
    WHERE pce.parent = pcd
    component = NAVIGATE pce → component_definition → product → name
    terminal = pce.terminal.name
    COLLECT {component, terminal}
  END
END

Starting point: PHYSICAL_CONNECTIVITY_DEFINITION filtered by name

Navigation path:

PCD → PCE → component terminal → component definition → product

Output:

[
  {component: "U1", terminal: "VCC"},
  {component: "R1", terminal: "2"},
  {component: "C1", terminal: "1"}
]

Query 3: Find Connections Between Two Components

Goal: Find all nets that connect two specific components.

Algorithm:

FOR EACH pcd IN Physical_Connectivity_Definition
  elements = FIND PCE WHERE parent = pcd
  component_names = elements.map(e -> navigate_to_component_name(e))
  IF target_component_1 IN component_names
     AND target_component_2 IN component_names
  THEN
    COLLECT {net: pcd.name, pins: extract_pin_pairs(elements, target)}
  END
END

Output:

[
  {net: "SPI_CLK", pins: [{component: "U1", terminal: "3"}, {component: "U2", terminal: "5"}]},
  {net: "SPI_MOSI", pins: [{component: "U1", terminal: "4"}, {component: "U2", terminal: "6"}]}
]

Practical Applications

Interconnect queries support:

Signal integrity analysis - Find all pins on high-speed nets
Net connectivity checks - Verify all pins on a net are properly connected
Bus analysis - Identify all nets in a bus (e.g., all SPI, I2C nets)
Troubleshooting - Find shorts between nets or open connections