ADLINK cPCI-7300 - Manual (Page 35)

Operation Theory
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Notes:
PORTA is default as Input channel; PORTB is default as output channel.
In DI32 mode, the PORTB has to be configured as the extension of PORTA,
that is, PORTB is the input port (DI16…DI31). PORTB control signals
are disabled.
In DO32 mode, the PORTA has to be configured as the extension of PORTB,
that is, PORTA is the output port (DO16…DO31). PORTA control
signals are disabled.
DI0: input LSB, DI31: input MSB;
DO0:output LSB, DO31:output MSB.
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