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L9965TS Datasheet(PDF) 49 Page - STMicroelectronics |
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L9965TS Datasheet(HTML) 49 Page - STMicroelectronics |
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49 / 62 page  5.12.2.1 Diagnostic functions Table 49. NVM integrity check diagnostic functions Fault type Assertion condition IC reaction to assertion Release condition Maskable NVM Trimming Integrity check fail At least one of the trimming sectors has failed the CRC check • The CRC check failing sector data is not downloaded into the local registers. Register data is replaced by all zeros. • TRIM_NVM_CRC_FAIL = 1 in GEN_STATUS3 • The FLT pin and the SPI FAULT is asserted in NORMAL if NVM_CRC_FAIL_MSK =0 in GENERAL_REG Clear on read • It is possible to mask all zeros replacement setting the NVM_CRC_FAIL_MSK bit before a download • FLT pin and SPI FAULT maskable by bit NVM_CRC_FAIL_MSK in GENERAL_REG NVM Configuration Integrity check fail At least one of the configuration sectors has failed the CRC check • The CRC check failing sector data is not downloaded into the local registers. Register data is replaced by all zeros. • CONF_NVM_CRC_FAIL = 1 in GEN_STATUS3 • The FLT pin and the SPI FAULT is asserted in NORMAL if NVM_CRC_FAIL_MSK =0 in GENERAL_REG Clear on read • It is possible to mask all zeros replacement setting the NVM_CRC_FAIL_MSK bit before a download • FLT pin and SPI FAULT maskable by bit NVM_CRC_FAIL_MSK in GENERAL_REG NVM Upload fail Failure in the upload phase of the NVM registers • NVM_VERIFY_ERR = 1 in GENERAL_REG Clear on read 5.12.2.2 Electrical parameters Table 50. NVM electrical parameters Symbol Parameter Test conditions Min Typ Max Unit NNVM_WRITE_CYCLES Number of allowed NVM write cycles to guarantee data retention Guaranteed by SCAN 1000 cycles TNVM_UPLOAD NVM user sector upload time duration Guaranteed by SCAN 12 ms TNVM_DOWNLOAD NVM full download time duration Guaranteed by SCAN 400 µs 5.12.3 Configuration Register data integrity check (CONF_CRC) In order to guarantee the integrity over time of key trimming and configuration data downloaded from NVM, safety relevant registers content (VIF_ID_CFG, GEN_CFG1, GEN_CFG2, GEN_CFG3) is automatically and cyclically checked against corruption within NORMAL mode: this is possible because local register data is provided with a CRC signature, that can be checked periodically (with period tCONF_CRC) when no operation on the NVM is performed, i.e. NVM circuit is in reset state. The local register CRC signature is managed in the following way: • Every time NVM data is downloaded into local registers (either automatic or user-driven), a CRC signature is refreshed as well • Every time the user changes the local register data, the corresponding CRC signature is not automatically updated, thus a CRC check failure is expected at the next execution cycle; as the user requests an NVM upload and refresh operation the local register CRC signature is updated accordingly, and no further CRC check failure is expected. To mask this systematic CRC check failure the user can set the GENERAL_REG.CYC_CRC_DIS bit. L9965T/L9965TS Functional description DS14987 - Rev 1 page 49/62 |
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