SFFS757 February   2024 DLP4620S-Q1 , DLPC231S-Q1

 

  1.   1
  2. 1Introduction
    1.     Trademarks
  3. 2 DLP4620S-Q1 Chipset Functional Safety Capability
  4. 3Development Process for Management of Systematic Faults
    1. 3.1 TI New-Product Development Process
    2. 3.2 TI Functional Safety Development Process
  5. 4 DLP4620S-Q1 Chipset Overview
    1. 4.1 Targeted Applications
    2. 4.2 DLP4620S-Q1 Chipset Functional Safety Concept
      1. 4.2.1 Typical Hazards
      2. 4.2.2 Chipset Architecture
      3. 4.2.3 Built-In Self Tests
    3. 4.3 Functional Safety Constraints and Assumptions
  6. 5Description of Hardware Component Parts
    1. 5.1 Description of System Level Built In Self Test (BISTs)
  7. 6Management of Random Faults
    1. 6.1 Fault Reporting
      1. 6.1.1 HOST_IRQ
      2. 6.1.2 Error History
      3. 6.1.3 Fault Handling
    2. 6.2 Functional Safety Mechanism Categories
    3. 6.3 Description of Functional Safety Mechanisms
      1. 6.3.1 Video Path Protection
        1. 6.3.1.1 Video Input BISTs
        2. 6.3.1.2 Video Processing BISTs
        3. 6.3.1.3 Video Output BISTs
      2. 6.3.2 Illumination Control Protection
        1. 6.3.2.1 Communication Interface and Register Protection
        2. 6.3.2.2 LED Control Feedback Loop Protection
        3. 6.3.2.3 Data Load and Transfer Protection
        4. 6.3.2.4 Watchdogs and Clock Monitors
        5. 6.3.2.5 Voltage Monitors
  8.   A Summary of Recommended Functional Safety Mechanism Usage
  9.   B Distributed Developments
    1.     B.1 How the Functional Safety Lifecycle Applies to TI Functional Safety Products
    2.     B.2 Activities Performed by Texas Instruments
    3.     B.3 Information Provided
  10.   C Revision History

3.2 TI Functional Safety Development Process

The TI functional safety development flow derives from ISO 26262 and IEC 61508 a set of requirements and methodologies to be applied to semiconductor development. This flow is combined with TI's standard new product development process to develop TI functional safety components. The details of this functional safety development flow are described in the TI internal specification - Functional Safety Hardware.

Key elements of the TI functional safety-development flow are as follows:

  • Assumptions on system level design, functional safety concept, and requirements based on TI's experience with components in functional safety applications
  • Qualitative and quantitative functional safety analysis techniques including analysis of silicon failure modes and application of functional safety mechanisms
  • Base FIT rate estimation based on multiple industry standards and TI manufacturing data
  • Documentation of functional safety work products during the component development
  • Integration of lessons learned through multiple functional safety component developments, functional safety standard working groups, and the expertise of TI customers

Table 3-1 lists these functional safety development activities which are overlaid atop the standard development flow in Figure 3-1.

Refer to Appendix B for more information about which functional safety lifecycle activities TI performs.

The customer facing work products derived from this TI functional safety process are applicable to many other functional safety standards beyond ISO 26262 and IEC 61508.

Table 3-1 Functional Safety Activities Overlaid on top of TI's Standard Development Process
AssessPlanCreateValidateSustain and End-of-Life
Determine if functional safety process execution is requiredDefine component target SIL/ASIL capabilityDevelop component level functional safety requirementsValidate functional safety design in siliconDocument any reported issues (as needed)
Nominate a functional safety managerGenerate functional safety planInclude functional safety requirements in design specificationCharacterize the functional safety designPerform incident reporting of sustaining operations (as needed)
End of Phase AuditVerify the functional safety planVerify the design specificationQualify the functional safety design (per AEC-Q100)Update work products (as needed)
Initiate functional safety case Start functional safety designFinalize functional safety case
Analyze target applications to generate system level functional safety assumptionsPerform qualitative analysis of design (i.e. failure mode analysis)Perform assessment of project
End of Phase AuditVerify the qualitative analysisRelease functional safety manual
Verify the functional safety designRelease functional safety analysis report
Perform quantitative analysis of design (i.e. FMEDA)Release functional safety report
Verify the quantitative analysisEnd of Phase Audit
Iterate functional safety design as necessary
End of Phase Audit
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