ADP5140WACCZ-R7 datasheet(42/128 Pages) AD

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ADP5140

Data Sheet

Rev. 0 | Page 42 of 128

When initialization is complete, the QA watchdog generates a

token and a corresponding watchdog internal answer. The QA

watchdog requires the processor to read the token through the

QA_WD_TOKEN register and then send back the calculated

answer by writing to the QA_WD_ANSWER register. Table 30

shows the relationship between the token and answer.

Table 30. Relationship Between Token and Answer

QA_WD_TOKEN, Bits[3:0]

QA_WD_ANSWER, Bits[31:0]

0x0

0x000FF0FF

0x1

0xE3EC131C

0x2

0x9B946B64

0x3

0x78778887

0x4

0x5659A6A9

0x5

0xB5BA454A

0x6

0xCDC23D32

0x7

0x2E21DED1

0x8

0x2D22DDD2

0x9

0xCEC13E31

0xA

0xB6B94649

0xB

0x555AA5AA

0xC

0x7B748B84

0xD

0x98976867

0xE

0xE0EF101F

0xF

0x030CF3FC

The interaction between QA watchdog and the processor

follows the sequence diagram shown in Figure 86.

PROCESSOR

Q/A

WATCHDOG

UNLOCK Q/A WATCHDOG CONFIGURATION REGISTERS

WRITE CONFIGURATION REGISTERS

(SEED, FAST/SLOW WINDOW)

LOCK Q/A WATCHDOG CONFIGURATION REGISTERS

READ BACK QA_WD_TOKEN

WRITE ANSWER TO QA_WD_ANSWER

CALCULATE FOUR 8-BIT ANSWERS

BASED ON QA_WD_TOKEN

CALCULATE FOUR 8-BIT ANSWERS

BASED ON QA_WD_TOKEN

READ BACK QA_WD_TOKEN

WRITE ANSWER TO QA_WD_ANSWER

GENERATE TOKEN

AND INTERNAL ANSWER

GOOD ANSWER: GENERATE NEW

TOKEN AND NEW INTERNAL ANSWER

BAD ANSWER: KEEP TOKEN AND

INTERNAL ANSWER UNCHANGE

GOOD ANSWER: GENERATE NEW

TOKEN AND NEW INTERNAL ANSWER

BAD ANSWER: KEEP TOKEN AND

INTERNAL ANSWER UNCHANGE

Figure 86. QA Watchdog and Processor Interaction Sequence Diagram

ADP5140WACCZ-R7 数据表(PDF) 42 Page - Analog Devices

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