SI Serial Input State Diagram

RESET

ADDCTR

SYSRESET/

NADIR

Write data to

buffer

DSR/

Increment

ADDCTR

ERROR

OF

!OF & DSR/

!OF & !DSR/

IDLE

!WRCOMP

DSR/

WRCOMP

• State Diagram Variables

  • SYSRESET/
    • VME system reset
  • NADIR
    • Pulse from SYNC generator every Nadir crossing
  • DSR/
    • Data set ready from asynchronous receiver state machine
  • WRCOMP
    • Control signal from buffer access state machine indicating that requested write is complete
  • OF
    • Overflow signal, set if SI transmits more words than it is allocated (ADDCTR > ALLOC)

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