Xycom XVME-212 Manual page 40

XVME-212 Manual
August, 1989
INTRODUCTION
The purpose of this appendix is to define XYCOM's
XVME I/O modules.
programming for the entire module line. The I/O Architecture specifies the logical aspects
of bus interfaces, as opposed to the "physical" or electrical aspects as defined in the
VMEbus specifications. The module elements which are standardized by the XYCOM I/O
Architecture are the following:
1 .
Module Addressing:
space and how software can read from it or write to it
2 .
Module
installed in a system
3 . Module Operational Status: How the operator can (through software)
determine the operational condition of specific modules within the system
4 . Interrupt
capability of the module to interrupt the system
5 . Communication between Modules: How master (host) processors and
intelligent I/O modules communicate through shared global memory or the
dual-access RAM on the modules
6 . The I/O Kernel:
facilitate the operation of all XYCOM I/O modules
MODULE ADDRESSING
The XYCOM I/O Architecture Design Specification recommends that XVME modules
should be addressed within the VMEbus-defined
restriction of I/O modules to the short I/O address space provides separation of
program/data address space and the I/O address space. This convention simplifies
software design and minimizes hardware and module cost, while providing 64K of address
space for I/O modules.
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Appendix A
XYCOM STANDARD I/O ARCHITECTURE
This Standard I/O Architecture has been incorporated on all
Identification:
Control: How software is able to control and monitor the
How intelligent and non-intelligent "kernels"
Standard I/O Architecture for
is
Where a module
How software can identify which modules are
64K short I/O address space.
A-l
positioned in the I/O address
The