This is the module register Front Panel I/O Control   0x811c

Allows setting of options applicable to the front panel I/O ports
0 = TRG/CLK are NIM I/O levels

bit 0: 0 = TRG/CLK are NIM I/O levels
       1 = TRG/CLK are TTL I/O levels

bit 1: 0 = panel output signals (TRG-OUT/CLKOUT) enabled
       1 = panel output signals (TRG-OUT/CLKOUT) enabled in high impedance

bit 2: 0 = LVDS I/O 3..0 are inputs
       1 = LVDS I/O 3..0 are outputs

bit 3: 0 = LVDS I/O 7..4 are inputs
       1 = LVDS I/O 7..4 are outputs

bit 4: 0 = LVDS I/O 11..8 are inputs
       1 = LVDS I/O 11..8 are outputs

bit 5: 0 = LVDS I/O 15..12 are inputs
       1 = LVDS I/O 15..12 are outputs

bit [7:6]: 00 = General Purpose I/O
           01 = Programmed I/O
           10 = Pattern mode: LVDS signal are input

bit 9: Pattern Latch Mode
       0 = PATTERN field is the status of 16 LVDS fp input latched with board internal trigger
       1 = PATTERN field is the status of 16 LVDS fp input latched with external trigger rising edge

bit 14: 0 = TRG-OUT Test Mode set to 0
        1 = TRG-OUT Test Mode set to 1

bit 15: 0 = I/O Normal operations
        1 = I/O Test Mode: TRG-OUT is a logic level set via bit 14