DLPU094 July   2020 DLP5530S-Q1

 

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A Summary of Recommended Functional Safety Mechanism Usage

Table 6 summarizes the monitoring and diagnostic features available in the chipset. Table 5 describes each column in Table 6. TI recommends the use of all mechanisms listed, unless one mechanism must be chosen instead of another. For example, the Video Tell-Tale Checksum and Video Frame Counter Checksum cannot be operated simultaneously so one must be selected.

Table 5. Legend of Functional Safety Mechanisms

Functional Safety Mechanism Description
Safety Mechanism Name The full name of this safety mechanism.
Safety Mechanism Operation Interval The time interval at which the mechanism or test is re-executed after a pass
Test Execution Time Time required for mechanism to definitively determine pass or fail condition.
Action on Detected Fault The response that this safety mechanism takes when an error is detected.
Time to Report Typical time required for safety mechanism to indicate a detected fault to the system or execute an emergency shutdown. Additional time may be required for host to read error condition from the chipset.

Table 6. Summary of Functional Safety Mechanisms

Safety Mechanism ID Safety Mechanism Name Safety Mechanism Operation Interval Test Execution Time Time to Report Action on Detected Fault
SM_1 Video Source Loss Detection 1 Video Frame 1 video frame TBD Stay in standby or switch to alternate source
SM_2 Video Tell-Tale Checksum 1 Video Frame 1 video frame TBD Configurable:
  • No Action (Information only)
  • Log Error and Switch to Alternate Source
  • Emergency Shutdown and Log Error
SM_3 Video Frame Counter Checksum 1 Video Frame 1 video frame TBD Configurable:
  • No Action (Information only)
  • Log Error and Switch to Alternate Source
  • Emergency Shutdown and Log Error
SM_4 Average Picture Level 1 Video Frame 1 video frame TBD Configurable:
  • Log Error
  • Emergency Shutdown and Log Error
SM_5 Front-End Functional Test 1 Driving Cycle 33 ms TBD Stay in standby and log error
SM_6 Back-End Functional Test 1 Driving Cycle 16 ms TBD Stay in standby and log error
SM_7 DLPC230S-Q1 Memory BIST 1 Driving Cycle 47 ms TBD Stay in standby and log error
SM_8 Frame Buffer Switch Watchdog 1 Video Frame 9x video frame time TBD Emergency shutdown and Log Error
SM_9 DMD High Speed Interface Training 1 Video Frame 8x video frame time TBD Log Error
SM_10 DMD Low Speed Interface Test 1 Video Frame 1 video frame time TBD Log Error
SM_11 DMD Memory Test 1 Driving Cycle 21 ms TBD Stay in standby and log error
SM_12 DMD Reset Instruction Watchdog 1 DMD Mirror Transition Interval 9x video frame time TBD Emergency shutdown and log error
SM_13 DMD Clock Monitor
SM_14 Host Command CRC 1 Host SPI Command Transaction 1 SPI Command Time. Timing depends on SPI frequency TBD Log Error
SM_15 Loss of Dimming Command Test Software Configurable Software Configurable TBD Emergency shutdown and log error
SM_16 TPS99000S-Q1 Interface Signal Connection Test 1 Driving Cycle 3 ms TBD Stay in standby and log error
SM_17 DLPC230S-Q1 to TPS99000S-Q1 SPI Byte-Wise Parity 1 DLPC230S-Q1 to TPS99000S-Q1 command transaction 1.1 micro-seconds (4 SPI packet transactions at 30MHz; initial transaction + three re-tries) TBD Emergency Shutdown and Log Error
SM_18 DLPC230S-Q1 to TPS99000S-Q1 ADC Interface SPI Parity 1 DLPC230S-Q1 to TPS99000S-Q1 AD3 transaction 4.1 micro-seconds (4 transactions at 30MHz; initial transaction + three re-tries) TBD Emergency Shutdown and Log Error
SM_19 TPS99000S-Q1 Password Protected Register Space 1 DLPC230S-Q1 to TPS99000S-Q1 Register Write 4x video frame time TBD
SM_20 TPS99000S-Q1 Register Checksum 1 video frame 1 video frame to detect and correct
4 video frames to detect persistent error		 TBD Emergency Shutdown and Log Error
SM_21 DAC to ADC Loopback Test 1 Driving Cycle 27 ms TBD Stay in standby and log error
SM_22 Photo Feedback Monitor 1 Video Frame Software Configurable TBD Depends on failure condition:
  • Emergency Shutdown and Log Error
  • Log Error
SM_23 Flash Table Transport CRC Every Data Transfer from Flash 1 video frame TBD Re-load data and Log Error
SM_24 DLPC230S-Q1 Memory ECC Continuous TBD
  • Correct Single-Bit Errors and Log Error
  • Emergency Shutdown and Log Error for multi-bit error
SM_25 DLPC230S-Q1 Memory BIST 1 Driving Cycle TBD Stay in standby and log error
SM_26 Flash Data Verification 1 Driving Cycle 42 micro-seconds / Kbyte of flash data TBD Stay in standby and log error
SM_27 Periodic Refresh 1 Video Frame or less N/A N/A N/A
SM_28 Boot ROM CRC 1 Driving Cycle Stay in Boot and Log Error
SM_29 TPS99000S-Q1 clock ratio monitor 1 video frame time 1 video frame TBD Log Error
SM_30 DLPC230S-Q1 Processor Watchdog (WD1) 72 ms 128 ms TBD HOST_IRQ and system reset
SM_31 DLPC230S-Q1 Sequencer Watchdog (WD2) 1 video frame 7x video frame time TBD Emergency Shutdown and Log Error
SM_32 Sequencer Instruction Read Watchdog Every sequencer instruction read, typically < 200 micro-seconds 9x video frame time TBD Emergency Shutdown and Log Error
SM_33 TPS99000S-Q1 DLPC230S-Q1 Real-Time Voltage Monitors Continuous 52 micro-seconds TBD Emergency Shutdown
SM_34 TPS99000S-Q1 DMD Voltage Monitors Continuous 52 micro-seconds TBD Emergency Shutdown
SM_35 TPS99000S-Q1 Input Voltage Monitor Continuous 52 micro-seconds TBD Emergency Shutdown
SM_36 TPS99000S-Q1 Internally Generated Voltage Monitors Continuous Immediately TBD Emergency Shutdown
SM_37 DLPC230S-Q1 DMD Voltage Monitor 1 video frame 1 video frame TBD Emergency Shutdown and Log Error
SM_38 DLPC230S-Q1 System Voltage Monitor 1 video frame 1 video frame TBD Log Error