RadiSys 6200plus Series Manuel d'utilisateur télécharger pdf (Page 62)

Chapter

5-1

Commands

Read this chapter to understand the command interface to the PLC-5/VME

processor. The orientation of this chapter is based on a driver program

running on a separate CPU module communicating with the processor.

Unless otherwise noted, all multiple-byte numerical fields are represented

in big-endian (Motorola) format, meaning that the most-significant data

byte appears in the lowest-addressed byte.

There are four types of commands:

Command Command

Word

Definition

Continuous Copy

to VME

0001H Instructs the PLC-5/VME processor to copy processor file

memory to VMEbus memory once per scan cycle of the

processor

It is similar in definition to the corresponding command in the

6008-LTV processor.

Continuous Copy

from VME

0002H Instructs the PLC-5/VME processor to copy VMEbus memory

to the processor file memory once per scan cycle.

Handle Interrupts 0003H Defines which VMEbus interrupts the PLC-5/VME processor

behaves as an interrupt handler.

Send PCCC FFFFH Sends a command packet containing a standard PCCC.

These were referred to as “selective” commands in the

6008-LTV processor.

Chapter

Objectives

Command Types

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RadiSys 6200plus Series Manuel d'utilisateur Page 62