Before adding data for all parts (e.g. pinouts), a refactoring of how fabric data is shared is required. For terminology:

• Fabric
  • The interior tile and routing layout within a FPGA silicon
• Device
  • The name of the fabric used by Vivado
• Package
  • A standardized pin layout that can be used with one or more devices.
• Part
  • A device wire bonded to a package
• Family
  • A collection of devices and parts that share some common traits.

Currently prjxray-db only has families (e.g. artix7, kintex7, zynq7) and parts (e.g. xc7a35tcpg236-1). Because prjxray-db is missing the explicit idea of a device and fabric, fabric data is currently duplicated between parts that have the same device. To be very specific:

• The fabric for a part is defined in prjxray-db/<family>/<part> with the following files:
  • node_wires.json
  • tilegrid.json
  • tileconn.json

Because some parts share fabrics with multiple parts, these files are copied between the parts. This is wasteful. The solution is to:

• Add a small file describing:
  • The list of parts in each family
  • The device for each part
  • The speed grades for each part
  • The fabric used in each device

Then the fabric data (e.g. tilegrid.json, etc) should be moved to fabric folder rather than a part folder. The prjxray library should be updated to transparently handle the fabric/device split from the part.

This change is required before adding part data for all parts.