See e.g. ​https://espace.cern.ch/Tracker-Upgrade/Pixel_electronics/Shared%20Documents/Services/ITServices_v1.4.pdf

TBPX (barrel)

Each module is a "ladder". Each ladder is split in Z to a long (5 modules and short (4 modules). Inner layers use 2x1 chip modules, outer two use 2x2 chip modules.

TFPX

4 concentric rings. Each (small) disk has two parts for odd and even rings. Each disk is split in half into two "dees".

TEPX

5 concentric rings, arranged in (large) disks.