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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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L9965TS Datenblatt(PDF) 29 Page - STMicroelectronics |
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L9965TS Datenblatt(HTML) 29 Page - STMicroelectronics |
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29 / 62 page  Table 28. SPI Target CRC calculation information Parameter Value Length 6 bit Polynomial x6 + x5 + x2 + x + 1 Seed 0x38 5.7.1.4 SPI error management The SPI communication is covered by several checks, described in Table 29 below. In case the frame received by L9965T/TS on SPI is not correct, it is discarded, the corresponding error bit is asserted in the status register COMM_ERR_SPI and at successive SPI access an SPI ERROR frame is issued with a specific bit set according to the error (see Section 5.8.3.7). Table 29. SPI Errors Fault type Assertion condition IC reaction to assertion Release condition Maskable SPI VIF_ID ERR Wrong VIF ID in previous received frame • Frame is discarded • SPI_VIF_ID_ERR = 1 in COMM_ERR_SPI • Next SPI MISO frame is the SPI ERROR frame Clear on read No SPI COMM_CRC ERR Wrong CRC in previous received frame • Frame is discarded • SPI_COMM_CRC_ERR = 1 in COMM_ERR_SPI • Next SPI MISO frame is the SPI ERROR frame Clear on read No SPI WRONG_ADDR Wrong address in previous received frame • Frame is discarded • SPI_WRONG_ADDR = 1 in COMM_ERR_SPI • Next SPI MISO frame is the SPI ERROR frame Clear on read No SPI SHORT_FRAME Short frame error (previous frame shorter than 40 bit) • Frame is discarded • SPI_ SHORT_FRAME = 1 in COMM_ERR_SPI • Next SPI MISO frame is the SPI ERROR frame Clear on read No SPI LONG_FRAME Long frame error (previous frame longer than 40 bit) • Frame is discarded • SPI_ LONG_FRAME = 1 in COMM_ERR_SPI • Next SPI MISO frame is the SPI ERROR frame Clear on read No 5.7.1.5 Electrical parameters The SPI timings shown in the figure below are reported in Table 30. L9965T/L9965TS Functional description DS14987 - Rev 1 page 29/62 |
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