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L9965TS Scheda tecnica(PDF) 29 Page - STMicroelectronics

Il numero della parte L9965TS
Spiegazioni elettronici  Automotive SPI to isolated SPI transceiver
PDF  62 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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L9965TS Scheda tecnica(HTML) 29 Page - STMicroelectronics

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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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