AMC 68VZ328 software manual D1 Application Note, Introduction

D1 Application Note 1

Using Digital I/O with dimmPCI Modules

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

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