Kaskod CANPC527D User manual

CANPC527D Isolated 1 Mb/s
Full CAN Interface Board
User,s Manual
KASKOD
1999
Sankt-Peteterburg

189625, S-Petrsburg, Pavlovsk,
Filtrovskoy road, 3
tel.: [phone]
Fax: [phone]
E-mail : [email protected]
[email protected]
http://www.kaskod.ru

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3
CANPC527D
INTRODUCTION 2
CANbuscontroller 2
Physicalinterface 2
Mechanicaldescription 2
Connectordescription 2
Terminalresistors 3
Whatcomeswithyourboard 3
Boardaccessories 3
CHAPTER 1 - BOARD SETTINGS 4
Baseaddressjumpers 5
Interruptrequestnumber 5
CHAPTER 2 - BOARD INSTALLATION 6
Boardinstallation 6
CHAPTER 3 - HARDWARE DESCRIPTION 7
CANPC527DCAN bus controller 7
GalvanicisolationoftheCANbus 8
CHAPTER 4 - BOARD OPERATION AND PROGRAMMING 9
Definingthememorymap 9
Interrupts 9
Whatisaninterrupt 9
Interruptrequestlines 9
8259Programmableinterruptcontroller 9
Interruptmask register (IMR) 9
End-Of-Interrupt(EOI) Command 10
Whatexactly happens when aninterruptoccurs? 10
Usinginterruptinyourprogram 10
Writinganinterruptserviceroutine(ISR) 10
Savingthe startup IMR andinterruptvector 12
CommonInterruptmistakes 12
APPENDIX A - CANPC527D Specification 14
APPENDIX B. What is CAN Interface? 15
APPENDIX C. Architectural Overlview 26
Table of Contents Page

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CANPC527D
Thisuser‘smanualdescribes the operation of the CANPC527DCan-businterfaceboard.
Someof the key properties ofthe CANPC527D include:
l1Mb/s maximum datarate (fullyprogrammable)
lFullCAN-functionally2.0B
lIntel 82527 CAN-bus controller
lGalvanicallyisolated physicalinterfacewithCAN transceiver
l+5V only operation
The following paragraphs briefly describe the major features of the CANPC527D. A more de-
tailed discussion is included in Chapter 3 (Hardware description) and in Chapter 4(Boad opera-
tion and programming). The boad set-up is described in Chapter 1 (Board Setting). A full descrip-
tion of the Intel 82527 CAN-controller is included in Chapter 4.
CAN-bus controller
The CANPC527D CAN-bus interface is implemented using the Intel 82527 chip. This controller
supports CAN Specification 2.0B. This versatile chip supports standard and extended Data and
remote frames as follows: A Programmable Global Message Identifier Mask; 15 message objects of
8-byteData Length and aProgrammableBitRate.Thisfully integrated chip supportsallthefunctinality
of the CAN-bus protocol.
Physical Interface
Industrialenvironmentsrequiregalvanicisolationandbusfilteringtoprovidereliabledata
communication and safety. CANPC527D has option for the physical interface.
Thegalvanicallyisolatedphysicalinterfaceis implementedusinghighspeedoptocouplersanda
DC/DCconverter. To protect the inputfromradiatedbusnoisea special balanced bus filter is
used.This filterisdesignedto meetEMIrequirements.
Mechanical description
TheCANPC527D is designed ona ISA form factor. An easymechanical interface to bothPC/104 and
EUROCARDsystems canbeachieved.PUTyour CANPC527Ddirectlyona ISA compatiblecomputer
usingtheonboardmountingholes.
Connector description
Fortheswitching ontwo identical connectors are used P1(channel1)and P2 (channel 2).
Pinoutisasfollows:
TABLE 1-1
contact signal
1nc
2 BUS_L
3 GND
4nc
5nc
6nc
7 BUS_H
8nc
9 VCC
INTRODUCTION

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CANPC527D
Explanation:
nc – notconnected (maybeused anyhow)
BUS_L – busactive low ( relatevelyGND)
BUS_H – busactivehigh(relatevelyGND)
GND – maybenot used
VCC – powersupply voltage +5V (inthisversionisnotused)
Terminal Resistors
CAN Standard implies terminal resistors at the end-nodes of the net. If in your specific configuration
channel1istheend-node,then setting of J2 is needed, if itischannel2thenJ3.
What commes with your board
Youwillreceivethe followingitemsinyoue CANPC527Dpackage:
lCANPC527DCAN-bus interface module
lSoftwarediskette with C sourcecode for CAN businterfacing for DOS
lUser‘smanual
Board accessories
Inaddition to the itemsincludedinyourCANPC527Ddelivery, severalsoftwareandhardwareaccesso-
riesareavailable.Callyour distributorformoreinformationontheseaccessories andforhelp inchoosing
thebestitemstosupportyourdistributedcontrolsystem.
lApplicationsoftware
Thirdpartyhighlevelprotocoldrivers
WIN 95/98 and WIN NT drivers and driver source code

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CANPC527D
The CANPC527D CAN bus interface board has jumper settings which can be changed to
suit your applicacation and host computer memory configuration. The factory setting are
listed and shown in the diagram in the beginning of this chapter.
Fig.1
CANPC527D contains 2 identical optoisolated CAN 2.0B specification channels. First chan-
nel registers begin from base address, the second - base address+100h. Each channel can
generate its interrupt request with its interrupt vector, or both channels can use one vector.
In this case interrupt request program must process both chanels simultaneously.
CHAPTER 1 - BOARD SETTING

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CANPC527D
Base Address Jumpers
Forbase address settingJ2is used.
J2consistsof11sections, and each section is associated with itsaddressline.
Note: Section0 (connectors 1-2) isreserved for S version.
Sectionsarearrangedasfollowing:
TABLE 1-2
Section 0 (connectors 1-2)  reserved
Section 1 (connectors 3-4)  A9
Section 2 (connectors 5-6  A10
Section 3 (connectors 7-8  A11
Section 4 (connectors 9-10)  A12
Section 5 (connectors 11-12)  A13
Section 6 (connectors 13-14)  A14
Section 7 (connectors 15-16)  A15
Section 8 (connectors 17-18)  A16
Section 9 (connectors 19-20)  A17
Section 10 (connectors 21-22)  A18
Thusbaseaddresspossiblerangesettingis:080000h-0FFE00h.
Explanation: BoardstartsworkingwhenaddresslinesignalA19issethigh.Connectioncorresponds
tohighlevel.
Examples:
To set base address 0C8000h - connect 21 and 22 in Section10, 15 and 16 in Section 7
(FACTORY SETTING).
To set base address 0D1E00h -
connect21 and 22 in Section 10, 17 and 18 in Section 8
connect 1 and 2 in Section 1 3 and 4 in Section 2
connect 5 and 6 in Section 3, 7 and 8 in Section 4
Interrupt request number setting
J4,J5 is usedfortheselection of interrupt request.
J4,J5 consists of 11 sections.
Followininterruptsareavailable
Channel number J4 J5
resistorinsert 1-2 1-2
15 3-4 3-4
14 5-6 5-6
12 7-8 7-8
11 9-10 9-10
10 11-12 11-12
7 13-14 13-14
6 15-16 15-16
5 17-18 17-18
4 19-20 19-20
3 21-22 21-22
Othersetting ofjumpersswitchoffthe interruptrequests.

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CANPC527D
BoardInstallation
Keepyourboardinitsantistatic baguntilyouarereadytoinstallittoyoursystem!When removingitfrom
thebag, hold the board at the edges anddo not touch the components or connectors. Pleasehandle the
boardinanantistaticenvironmentandusearoundedworkbenchfortestingandhandlingofyourhardware.
Before installing the board in your computer, check the jumper setting. Chapter 1 reviews the
factory settings and how to change them. If you need to change any setting, refer to the appropri-
ate instructions in Chapter 1. Note that incompatible jumper settings can result in unpredictable
board operation and erratic response.
Generalinstallationguidelines:
1.Turn OFFthe power to your computer and all devicesconnected to CANPC527D
2.Touch thegroundedmetalhousingof your computertodischargeanyantistaticbuildupand
thenremovethe board from its antistatic bag.
3.Holdtheboard by the edge and installitinan enclosure or place it onthetableon an antistatic
surface.
4.Connectthe board to theCAN fieldbus interface header connectors.Make sure the polarity of
thecableis correct. Both connectorsare identical, one of theseheaders may be used tobring the
CANbustotheonechannel; the other connector interfaces for second channel.
CHAPTER 2 - BOARD INSTALLATION

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CANPC527D
Chapter 3 - Hardware discription describes the major features of the CANPC527D: the Intel 82527
CANbus controller, Galvanic isolationoftheCAN-bus.
Figure 3-1 shows the general block diagram of the CANPC527D. This chapteer describes the major
featuresoftheCANPC527D: the Intel 82527 CAN-bus controller,Galvanicisolationof the CAN-bus,
theFiberoptic interface, theOnboardconfigurationEEPROM,and Digital I/O.
Fig. 3-1. CANPC527D Block diagram
82527 CAN bus controller
Reference note:
(Intelpublication CAN ArchitecturalOverview, AutomotiveProductsDatabook)
The 82527 CAN controller consists of six functional block. The CPU interface logic manages the
communicationtothe host computer. The CAN controller interfacetotheCANbusandimplementsthe
protocol rules of the CAN protocol for the transmission and reception of messages. The RAM is the
physicalinterfacelayerbetween the host CPU and theCANbus.One eight bit I/O port provideslow
speedI/Ocapabilities.
The82527 RAM providesstorage for 15message objects of8 byte length.Each message objecthas a
uniqueidentifier and canbe configuredtoeithertransmitof to receiveexceptforthelast message object.
Thelastmessage object is areceive-only buffer with a specialmask design to allow selectedgroups of
differentmessageidentifierstobereceived.
Eachmessage identifiercontainscontrolandstatus bits.Amessageobject with adirectionsetfor receive
willsendaremoteframebyrequestingamessagetransmission.Amessagesetastransmitwillbeconfigured
toautomaticallysendadataframewheneveraremoteframewithamatchingidentifierisreceivedoverthe
CANbus.Allmessageobjectshaveseparatetransmitandreceiveinterrupt and status bits, allowing the
CPUfull flexibilityindetectingwhen aremoteframehas beensentorreceived.
CHAPTER 3 - HARDWARE DESCRIPTION

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CANPC527D
The82527alsoimplementsa globalmaskingfeatureforacceptancefiltering.This featureallowsthe user
togloballymask,or “don`tcare”,anyidentifierbitsof theincomingmessage.Thismaskisprogrammable
toallowtheusertodesignanapplicationspecificmessageidentificationstrategy.Thereareseparateglobal
maskforstandardandextendedframes.
Theincomingmessagefirstpassesthroughtheglobalmaskandismatchedtotheidentifiersinthemessage
objects1-14. If there isno identifier match thenthe message passes throughthe local mask inmessage
object 15. the local mask allows a large number of infrequent messages to be received by the 82527.
Message object15 is also bufferedto allow theCPU time to servicea message received.
Galvanic isolation of the CAN-bus
Thegalvanicisolationof theCANPC527Disimplementedusing
1)Optocouplersfor data transmission and
2)aDC/DCconverter to supply power to theCANbusand the physical interface circuitry.
The high speed optocouplers are directly connected to the 82527. the optocouplers drive CAN bus
transceiver. A special balancedCAN bus choke is usednot only toimprove immunity to busnoise, but
alsotoprotectthebustransceiver. This filter assists in conforming to the EN5502 Radiated Emision test
requirements.