ADLINK PCIe-7300A - Manual (Page 31)

Registers 21
Legend:
X DI_CSR: Digital input control & status register
X DO_SCR: Digital output control & status register
X AUX_DIO: Auxiliary digital I/O port
X INT_CSR: Interrupt control and status register
X DI_FIFO: DI FIFO direct access port
X DO_FIFO: DO FIFO direct access port
X FIFO_CR: FIFO almost empty/full programming register
X POL_CTRL: Polarity control register for the control signals
Caution:
X I/O port is 32-bit width
X 8-bit or 16-bit I/O access is not allowed.