    I/O Style - OD    - OpenDrain
              - PU    - Pullup
              - KPR   - Keeper
              - S     - SchmittTrigger
              - DG    - DataGate
    Reg Use   - LATCH - Transparent latch
              - DFF   - D-flip-flop
              - DEFF  - D-flip-flop with clock enable
              - TFF   - T-flip-flop
              - TDFF  - Dual-edge-triggered T-flip-flop
              - DDFF  - Dual-edge-triggered flip-flop
              - DDEFF - Dual-edge-triggered flip-flop with clock enable
              /S (after any above flop/latch type) indicates initial state is Set