ADLINK PCI-7300A - Manual (Page 44)

32 Operation Theory
X DO0:output LSB, DO31:output MSB.
X
LSB: Least Significant Bit, MSB: Most Significant Bit
4.2 Block Diagram
Figure 4-1 shows the block diagram of the cPCI/PCI-7300A, it
includes the I/O registers, two 16K FIFOs, auxiliary DIO, active
terminators, and so on.
Figure 4-1: Block diagram
PORTA:
16 Digital I/O Port, it can be set as terminated
mode or non-terminated mode
PORTB:
16 Digital I/O Port, it can be set as terminated
mode or non-terminated mode
FIFO: Two 16K words FIFO for digital I/O data buffer
AUX DO 3..0: Four auxiliary digital outputs
AUX DI 3..0: Four auxiliary digital inputs
DITRIG: Digital input trigger line
DIACK/DIREQ: Digital input handshaking signals
DOTRIG: Digital output trigger line
DOACK/DOREQ: Digital output handshaking signals