ADLINK Technology cPCI-7300A, User Manual

Page: 39 / 114

Registers 29
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:
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 config-
ured as 16-bit wide or 32-bit wide.
DO_FIFO_32
Bit 31 - Bit 16 of digital output FIFO of the digital output is con-
figured 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 meaning-
less.
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