- GAPMod comes in 2 variants:
- one that bears a HyperBus Flash+RAM MCM (GAPMod1.x)
- one that bears a Quad-SPI Flash and Quad-SPI RAM (GAPMod2.x)
HyperBus memory provides more bandwidth but is more expensive and possibly less easy to source than QSPI memories.

** File GAPMod_xxx_IO_Definition.xlsx documents the role of each GAPMod I/O and how they relate to GAP8 **


- Beware if switching from GAPMod1.2 to GAPMod2.x : 
  the level shifter that was present on UART signals in GAPMod1.2 is no longer present in GAPMod2.x.
  As a result, while UART signals were referenced to SAFE_VDD_IO at GAPMod1.2 boundary, they are
  referenced to SPIM_VDDIO (i.e. same as natively on GAP8) at GAPMod2.x boundary.