ADLINK cPCI-7300 - Manual (Page 30)

22 • Registers
3.7 DO_FIFO: DO external data FIFO direct access
port
The digital output FIFO data can be accessed through this port directly.
Address: BASE + 0x0C
Attribute: READ/WRITE
Data Format:
Bits 7 6 5 4 3 2 1 0
Bit # 7~0 DO_FIFO_8
Bit # 15~8 DO_FIFO_16
Bit # 31_16 DO_FIFO_32
DO_FIFO_8
Bit 7 ~ Bit 0 of digital output FIFO
DO_FIFO_16
Bit 15 ~ Bit 8 of digital output FIFO if the digital output is configured as 16-bit
wide or 32-bit wide.
DO_FIFO_32
Bit 31 ~ Bit 16 of digital output FIFO of the digital output is
configured as 32-bit wide
Note: Although this port is R/W port, read operation should be avoided in
normal operation. If both PORTA and PORTB are configured as input
ports, read/write to this port is meaningless.