Description of the CSPAD ASIC arrangement

Note that "Element"=Quadrant, and "Section"=2x1.


  Each "Element" represents one quadrant of a complete detector
  and they are arranged as follows (viewed from upstream):
  +---+---+
  | 0 | 1 |
  +---+---+
  | 3 | 2 |
  +---+---+

  Each "Element" is composed of 8 "Section"s arranged as follows:
  +---+---+-------+
  |   |   |   6   |
  + 5 | 4 +-------+
  |   |   |   7   |
  +---+---+---+---+   (for quadrant 0)
  |   2   |   |   |
  +-------+ 0 | 1 |
  |   3   |   |   |
  +-------+---+---+
  The layout of each successive quadrant is rotated 90 degrees clockwise
  with respect to the previous quadrant.

  Each "Section" is composed of 2*194 rows by 185 columns with the following 
  orientations (for quadrant 0):
    Sections 0,1: row index increases from bottom to top, column index increases from left to right
    Sections 2,3: row index increases from left to right, column index increases from top to bottom
    Sections 4,5: row index increases from top to bottom, column index increases from right to left
    Sections 6,7: row index increases from left to right, column index increases from top to bottom
  Again, the orientations of the Sections for quadrant 1 are rotated 90 degrees clockwise 
  and so on for each successive quadrant.