FS6407 datasheet(65/111 Pages) NXP

65 / 111 page

NXP Semiconductors

FS6407/FS6408

7.2.2

Secured SPI command

Some SPI commands must be secured to avoid unwanted change of the critical bits. In the fail-safe machine and in the main state

machine, the secured bits are calculated from the data bits sent as follows:

• Secure 3 = NOT(Bit5)

• Secure 2 = NOT(Bit4)

• Secure 1 = Bit7

• Secure 0 = Bit6

INIT FSSM#2

00101

#37(25h)

Write during INIT phase then Read only

Table 69

WD_Window

00110

#38(26h)

Write (No restriction) and Read

Table 71

WD_LFSR

00111

#39(27h)

Write (No restriction) and Read

Table 73

WD_answer

01000

#40(28h)

Write (No restriction) and Read

Table 75

FS_OUT

01001

#41(29h)

Write (No restriction)

Table 77

RSTb request

01010

#42(2Ah)

Write (No restriction)

Table 79

INIT WD

01011

#43(2Bh)

Write during INIT phase then Read only

Table 81

Diag FS1

01100

#44(2Ch)

Read only

Table 83

WD_Counter

01101

#45(2Dh)

Read only

Table 85

Diag_FS2

01110

#46(2Eh)

Read only

Table 87

Table 16. Secured SPI

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

Data 3

Data 2

Data 1

Data 0

Secure 3

Secure2

Secure 1

Secure 0

Table 15. Register mapping of fail-safe logic (continued)

Address

Write description

Table ref.

FS/M

Hex

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