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Application Note 1
Using Digital I/O with dimmPCI Modules
D1
July 4, 2003 Version 0.4
Author: Bernice Lau
Introduction
For the purposes of direct digital I/O, there are a maximum of 27 general-purpose I/O lines leading from the
Motorola MC68VZ328 to the dimmPCI backplane. These lines also have dedicated functions, the LCD, EEPROM,
SPI, or ICE_DEBUG, so all lines may not be available, depending on the hardware and the options compiled into
the kernel. Digital I/O can be used on a dimmPCI module when in either the system slot or peripheral slot.
The I/O points can be accessed through a character device driver using standard system calls. Upon opening
the device on first use, the set of unreserved I/O points will be made available to the user. Pins that have been
reserved for their dedicated function will not be accessible. Configuration of the I/O points is achieved through
ioctl calls, after which reads and writes can be performed.
Requirements
• dimmPCI passive backplane
• NETdimm, or IOdimm, or CANdimm
• SDK 2.05 or higher (2.0.38 or higher kernel source and filesystem)
• sample programs in SDK, /opt/samples/user_code/dio
o even_parity.c
o xor.c