L9396 datasheet(79/109 Pages) STMICROELECTRONICS

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DS12539 Rev 6

79/109

L9396

System functional safety implementations

108

WD Answer Timing

SPI parameters are programmable only before the WD mechanism starts. After the first

seed request, these parameters can be only read.

A WD1_RESET event does not clear programmed parameters; default values are applied

only as a consequence of a WSM RESET.

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

76543210

Addr

T_Answ_TimeOut_Delta

T_Valid_Answ_End_Delta

T_Valid_Answ_Start

CRC

SPI parameter

Size

(bits)

default

Description

T_Valid_Answ_Start

0xFF

Start of the timing window inside which answers must be

received. Absolute value.

Time = T_Valid_Answ_Start * WD_clk

T_Valid_Answ_End_Delta

0x30

End of the timing window inside which answers must be

received. The value specified is an incremental time starting

from T_Valid_Answ_Start.

Time = (T_Valid_Answ_Start + T_Valid_Answ_End_Delta) *

WD_clk

T_Answ_TimeOut_Delta

0x00

End of the period for answers acceptance. Once reached, the

WD1_RESET signal will be sent independently of the Error

status (WD_CNT). The value specified is an incremental time

starting from T_Valid_Answ_Start and

T_Valid_Answ_End_Delta.

Time = (T_Valid_Answ_Start + T_Valid_Answ_End_Delta +

T_Answ_TimeOut_Delta) * WD_clk

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