ADLINK PCIe-7300A - Manual (Page 35)

Registers 25
X 0: start output data immediately
X 1: delay output data until DOTRIG is actived
PB_TERM_OFF (R/W)
X 0: PORTB terminator ON
X 1: PORTB terminator OFF
PG_STOP_TRIG (R/W)
X 0: no effect
X 1: Stop pattern generation when DOTRIG is deasserted
DO_EN (R/W)
X 0: Disable digital outputs
X 1: Enabled digital outputs
DO_FIFO_CLR (R/W)
X 0:No effect
X 1:Clear digital output FIFO. If both PORTA and PORTB are
configured as outputs, both FIFO will be cleared. Always get
0 when read.
DI_UNDER (R/W)
X 0:DO FIFO does not empty during data output
X 1:DO FIFO is empty during data output, some output data
may be output twice. Write 1 to clear this bit
DO_FIFO_FULL (RO)
X 0: DO FIFO is not full
X 1: DI FIFO is full
DO_FIFO_EMPTY (RO)
X 0: DO FIFO is not empty
X 1: DO FIFO is empty
BURST_HNDSHK (R/W)
X 0: disable burst handshaking mode
X 1: enable burst handshake mode
Note: This bit is for Rev.B only.