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XVME-240 Manual
October, 1984
3.1
INTRODUCTION
This chapter provides the information needed to program the DIO to perform Input
and/or Output data transfers and how to use the unique design features which are a
part of XYCOM I/O modules. The chapter is arranged in the following order:
Module base addressing
-
-
The Module I/O Interface Block and how it is addressed
Interrupts
-
3.2 MODULE BASE ADDRESSING
XYCOM I/O modules are designed to be addressed within the VMEbus-defined 64K
Short I/O Address space. When the DIO module is installed it will occupy a 1K byte
block of the Short I/O Address space (referred to as the module I/O Interface Block).
The starting address for each I/O Interface Block must reside on a 1K boundary. Thus,
the module base address will be one of the 64 - 1K boundaries available within the
Short I/O Address space (refer to Chapter 2, Table 2-2 for a complete list of the 64 -
1 K boundaries).
Figure 3-l shows the module I/O Interface Block for the DIO and how it relates to the
Short I/O Address space. In this example, the module base address resides on the
boundary at 1000H
address switches). This means that the module would occupy the
t o 1400H.
Chapter 3
USING THE DIO MODULE
(refer to Chapter 2, Section 2.4.1
for information on using base
3-l
1K
block from lOOOH
1K
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