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Digital I/O
The Motorola MC68VZ328 processor provides numerous general purpose I/O lines to the dimmPCI
TM
.
The lines which have not been assigned to their dedicated functions can be used for digital I/O.
Depending on the options compiled into the kernel, a number of pins on the dimmPCI
TM
module can be
used for digital I/O. The configuration procedure for setting up the digital I/O functions is outlined in
Appendix D1.
IOdimm
The IOdimm module can be used as a stand-alone or as a peripheral dimmPCI device. Instructions for
setting up the IOdimm to be used as a peripheral device are provided in Appendix D2.
The IOdimm provides general purpose input and output. The IOdimm can provide up to 8 digital
inputs, 4 digital outputs, 8 12-bit analog inputs and 2 12-bit analog outputs. Figures 7.1-7.4 shows the
schematics for the digital and analog I/O. The IOdimm also have general purpose I/O lines that are
provided by the Motorola processor as mentioned earlier. However, the IOdimm has its own driver for
the SPI pins and therefore these pins will not be available for use by this driver (refer to Digital I/O
application note in Appendix D).
The MAX1203 pic is used to convert analog signals to digital signals and the TLV5618A is used to
convert digital signals to analog signals. The schematices for the digital to analog converter (DAC)
and the analog to digital converter (ADC) are shown in Figures 7.5 and 7.6 respectively.
The IOdimm signals are summarized in Figure 7.7. Only pins 1-29 are described in the table. Pins 30-84
have the same signals as the NETdimm. Those signals are shown in Figure 10.