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Part5: Product development at the HW level - Coggle Diagram
Part5: Product development at the HW level
Scope_D2P123
SPFM/LFM Calucation
PMHF Calucation
FMEDA
Development Failure Analysis, DFA
Hardware Safety Analysis
Hardware Verification Plan
Hardware Architecture Design
Hardware Verification Report
Hardware Safety Requirements specification
Fault Injection Test Report
Vocabulary_D2P124
HW part:
portion of HW component at the first level of hierarchical decomposition
HW which cannot be subdivided
Component
non-system level element that is logically or technically separable and is comparised of more than one HW part or one or more SW units.
Example: A microcontroller
5-5 General topics for product development at HW level_D2P126
Work product
HW development plan
HW safety plan
HW verification plan
General&
Require Activies and Process
the analysis of potential HW faults and their effects : FMEDA
the HW implementation of the technical safety concept, TSC&
technical safety requirements, TSR
The coordication with SW development: HSI SW controller HW
The necessary activities and processes for the product development at the HW level include:
硬體開發總則
HW與SW, System的介面是否清楚
硬體開發流程是否符合ASIL要求
系統層的TSR是否已經分配到硬體
ADAS camera確認Sensor, PMIC, MCU/ISP, SerDes, Power Tree, Reset, Clock, Memory硬體元件是否納入安全開發範圍
是否定義硬體驗證方法與安全分析方法
Objectives
Determine and plan the functional safety activities during the individual sub-phases of HW development
硬件開發流程與計畫
定義硬件開發流程 硬體安全生命週期 與系統層TSR.TSC的銜接
重點是確認HW開發環境 設計方法 驗證策略與ASIL要求一致
5-6 Specification of HW safety requirements_D2P127
Work product
Hardware Safety Requirements Specification, HSR
including test and evaluation criteria
HSI specification
HW safety requirements verification report
HW Safety Requirements HSR
系統層安全需求
轉成硬體可以設計與驗證的需求'
Fault detction 故障如何被偵測
Fault reaction 故障後系統如何反應
Safety mechanism 例如 電源監控, 影像訊號監控, 溫度監控,
通訊CRC Cyclic Redundancy Check
Fault reaction time 從故障發生到進入安全狀態的時間
ASIL allocation 每個HW safety requirement對應的ASIL
Verification method 需求如何驗證
Safety requirements and
attributes of safety mechanisms
to ensure tolerance to external failures
to comply with the safty requirements.
to control internal failures of HW
to detect and signal internal or external failures
Requirements for verification of HW-SR
Completeness with respect to TSR allocated to HW element
Consistency with relevant SW-SR
Consistency with technical safety concept, system design specification, and HW specification
Correctness and accuracy
Objectives
to define the HW-SW interface, HSI specification initiated in system level.
Verify the HW safety requirements and the HSI specification are consistent with the technical safety concept and the system design specification.
Specify rhe HW safety requirements. They are derived from the technical safety concept and system design specification
寫出硬件安全需求HSR_Safety requirement如何從TSR trace到HSR
將系統層TSR分解成硬件安全需求HSR 需求藥可追朔 可驗證
完整 一致 並包含安全機制 反應時間 操作模式 故障偵測需求
General
The trchnical safety requirements are allocated to HW and SW. this part are to yield HW-only safety requirements.
The HW safety requirements are allocated to HW and SW. this part are to yield HW-only safety requirement.
5-7 Hardware Design_D2P137
Objectives
根據HSR進行硬件架構與電路設計 需考量安全機制
EX. Watchdog, lockstep CPU, ECC memory, 電源監控, 過壓/ 欠壓偵測, 診斷電路
HW-failures in safety-relevant systems can be classified
Failures arising before and during the system installation
Failures arising after the system installation (random failures)
依HSR做硬體安全設計_Sensor/ PMIC/ SerDes 失效如何可偵測
General
HW Design requirements
根據HSR進行硬件架構與詳細設計
Safety analysis
Verification of HW design
HW detailed design
Production, operation, service and decommissioning
HW architectural design
設計項目
MCU/ISP
Lockstep（鎖步技術） 硬體層級的即時錯誤偵測機制
Self-test（自我測試） 自我檢查硬體功能是否正常
Diagnostic Coverage（診斷覆蓋率）衡量安全機制的量化指標
Memory
ECC (Error-Correcting Code，錯誤校正碼)
CRC (Cyclic Redundancy Check，循環冗餘校驗)
RAM test (隨機存取記憶體測試)
Flash test (快閃記憶體測試)
Reset Circuit_
watchdog reset (看門狗重置) 防止程式「死當」或卡在無窮迴圈/
Brown-out Reset (欠壓重置，簡稱 BOR) 防止電源不穩導致系統誤動作或資料損毀
Sensor
frame counter/ CRC/ test pattern/ sensor status readback
Clock Circuit_Clock loss detection
SerDes/ MIPI
data integrity / CRC/ Link error detection
Power Circuit_功能安全重點 過壓 欠壓 短路 電源sequencing
Thermal
over-temperature detection and reaction