1. Proposed Module I/O features: Beam Sync Input - fiber, derived from zero-crossing of the AC line
Beam Sync Output - fiber, one microsecond pulse of Beam Sync Input
Aux Sync Output - fiber, delayed time-variable pulse allowing triggering of diagnostics synchronously with Beam Sync (still pondering granularity of time increments, suggestions?) Acc PSS A & B Inputs - fiber, from PSS, both "live" and latched statuses available for readback
Acc , Hall A, Hall B, Hall C, Hall D FSD Inputs - fiber, both "live" and latched statuses available for readback
Hall A, Hall B, Hall C, Hall D Beam Outputs – Lemo and fiber, individual beam modulation for each Hall
Mizar card interface - required or not in the future?

2. Proposed Timing Features: Retain 10, 15, 30Hz Harmonic modes of operation. Retain 57-60Hz free-run modes. VL mode - generated at a variable time from us AFTER Beam Sync.  Variable pulse width duration from 250ns - 10us in 250ns increments. Tune mode - triggered at Beam Sync.  Fixed time length of 250us with variable beam-on period from 100us - 250us in 10us increments.
“Beam-off” time period from us in 250ns increments.
Marker pulse width duration from 250ns – 10us in 250ns increments. CW mode - no change from existing system. User/expert mode - Mizar-generated signal if retained, or the possibility of complex user-defined timing structures embedded in the FPGA (TBD and implemented).
Multiple VL or Tune mode output pulses per single 60Hz cycle?

3. Beam Sync Input VL Mode Tune Mode CW Mode 250ns-10us “ON 347-354us
97-104us “OFF
CW Mode