ISO26262硬软件接口HSI

1、HSI HW SW InterfacePart/material No.Part/material nameAuthorStatusDocument No.Project NoProject nameOwnerDoc typeDoc partVersionProduct groupCustomerDocument descriptionwordHSI, Hardware-Software Interface<Project Name>123 Table of Contents1TABLE OF CONTENTS22REVISION HISTORY33INTRODUCTION43.1

2、General overview43.2About this document43.3Abbreviations44REFERENCES55SYSTEM OVERVIEW66HW SW INTERFACE66.1Input and Output mapping table66.2MCU selection76.3MCU internal interfaces76.4General purpose I/O76.5Memory86.6Communication interface8Controller area network (CAN)8Local interconnect network (L

3、IN)86.7A/D converter86.8D/A converter96.9Pulsewidth modulation (PWM)96.10Multiplexer96.11Reset circuitry96.12Clock circuitry96.13Watchdog106.14Other interfaces104 Revision HistoryVersionECN no.Changed byChange from last version01The change history shall be a detailed enough description of what secti

4、ons that have been changed since the last version. Depending on the changes that have been made it may be necessary to describe the changes more in detail.Blue text in italic is information/explanation directed to the issuer of the document.Before releasing the Work Product (document) all blue itali

5、c text must be removed.Mark unused sections of this document as “NOT APPLICABLE, do not remove the paragraph heading.Text marked with a <green background> is to be replaced by something specific. This shall be used if there are specific keywords within standardized paragraphs that shall be rep

6、laced when creating the Work Product from the template.5 Introduction5.1 General overviewThis section shall contain a brief description of the background of and/or reason for this development project. Describe briefly the system being developed. If the product/item developed at this level is part of

7、 a system, also briefly describe the products relationship to the system.This section shall also state who is the projects end customer.5.2 About this documentThe purpose of this document is to specify the interfaces between HW and SW blocks in a system design. The HW-SW interface is created and spe

8、cified in the system design process. As development continues during the HW level development and SW level development, this specification is refined. The HW-SW interface specification shall specify the HW and SW interaction and be consistent with the technical safety concept when applied to a syste

9、m with functional safety requirements. The specification shall include the systems HW devices that are controlled by SW and HW resources that support the execution of SW.5.3 AbbreviationsAbbreviationHSIHardware Software InterfaceHWHardwareKA AutomotiveMCUMicro Controller UnitSWSoftware6 ReferencesRe

10、fIdIssueDocument Name7 System overviewProvide a system overview here or provide a reference to a system design overview.8 HW SW InterfaceThis section provides a description of the HW-SW interfaces in subsequent chapters. All system components where HW and SW interacts are included.Remember to limit

11、the information to the interfaces where HW and SW design interacts. MCU internal interfaces shall typically not be described here if they dont have impact on the HW design. For every interface in the HSI specification the following general characteristics shall be described:· Interface typeo In

12、put/output, analog/digital, pwm, serial/parallell, communication etc.· Electrical characteristicso Levels, ranges, offsets· Timing characteristicso Rise times, fall times, setup times, periods, frequencies etc.· Accuracy and resolution· Shared or exclusive use · Diagnosticso

13、 Capabilities of the HWo Implemented in SW· Data integrityo Error detection and correctiono Checksum and parityThe following heading structure shall be used as a guideline and shall be modified to suit the specific system by adding or removing headings.8.1 Input and Output mapping tableThis sec

14、tion provides a table with HW-SW interface signals and their basic characteristics. Use the following table as a base and modify it to suit the specific system.NameI/OHW-identifierSW-identifierMCU pin #TypeRangeInput-1IIN1IN11analog0-5VInput-2IIN2IN22digitalTTLOutput-1OOUT1OUT13digitalCMOS8.2 MCU se

15、lectionProvide information about the MCU selection with product identity and type/version.Provide a reference to the MCU datasheet. Provide references to application notes and errata when applicable.Provide information about the MCU family and scaleability. What are the nearest smaller or larger mem

16、ory sizes. What packages and pin counts are available.State basic data about the MCU.8.3 MCU internal interfacesState specific chapters in the datasheets for MCU specific internal modules and I/O blocks.State references to application notes and errata when applicable.8.4 General purpose I/OProvide i

17、nformation about general purpose I/O interfaces. Complement the information stated in the input output mapping table when applicable.Provide the following characteristics:· I/O interface type and signal range/levels· Configuration and initialization· Setup times due to MCU external HW

18、· MCU internal pull-up or pull-down configuration· MCU external pull-up or pull-down configuration8.5 MemoryState memory types (RAM, ROM, Flash, EEPROM etc.) and size.State whether the memory is external or MCU internal. Provide the following characteristics:· Read, write, erase metho

19、ds · Address range and data size· Performance and timing data· Data integrity mechanisms8.6 Communication interface Provide information about communication interfaces, MCU internal or external. Limit the information to the HW related interface, typically the physical and transport lay

20、ers. Higher protocol layers are typically SW implementations and should not be covered here.Provide the following characteristics:· Serial, parallell, master, slave· Speed or bandwidth range· Read and write methods· States and modes· Addressing and arbitration8.6.1 Controlle

21、r area network (CAN)Provide additional information about CAN interfaces when applicable.8.6.2 Local interconnect network (LIN)Provide additional information about LIN interfaces when applicable.8.7 A/D converterProvide information about MCU internal and external A/D converters. Provide the following

22、 characteristics:· Resolution and accuracy· Setup time constraints· Conversion time constraints8.8 D/A converterProvide information about MCU internal and external D/A converters. Provide the following characteristics:· Resolution and accuracy· Setup time constraints· C

23、onversion time constraints8.9 Pulsewidth modulation (PWM)Provide information about MCU internal and external PWM interfaces. Provide the following characteristics:· Initialization and configuration· Period and dutycycle configuration range· Control and operation8.10 MultiplexerProvide

24、 information about MCU internal or external multiplexer interfaces. Provide the following characteristics:· Initialization and configuration· Timing constraints· Control and operation8.11 Reset circuitryProvide information about MCU internal and external reset circuitry. Provide the following characteristics:· Initialization and configuration· Timing constraints· Control and operational modes8.12 Clock circuitryProvide information about timing devices, oscillators