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DS1961S датащи(PDF) 13 Page - Dallas Semiconductor

номер детали DS1961S
подробное описание детали  1kb Protected EEPROM iButton With SHA-1 Engine
PDF  36 Pages
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производитель  DALLAS [Dallas Semiconductor]
домашняя страница  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS1961S датащи(HTML) 13 Page - Dallas Semiconductor

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DS1961S
13 of 36
Figure 7-4. MEMORY AND SHA FUNCTIONS FLOW CHART (continued)
33h
Compute Next
Secret ?
Y
N
* 1-Wire Idle High for Power
Note: The Master Must First
Load the Scratchpad With a
Partial Secret of 8 Bytes
From Figure 7
3rd Part
To Figure 7
3rd Part
From Figure 7
5th Part
To Figure 7
5th Part
Valid Data
Address ?
Y
Bus Master
RX “1”s
Master
TX Reset ?
Y
N
N
N
SHA Engine Computes Message
Authentication Code of Current
Secret, Page Data, and 8 Byte
Partial Secret in Scratchpad
DS1961S Copies a Partial
MAC to the Secret Register
Master
TX Reset ?
Master
TX Reset ?
Y
N
DS1961S TX “1”
DS1961S TX “0”
N
Y
DS1961S Fills Scratchpad With AAh
*
*
Write-
Protected ?
Y
Bus Master TX
TA1 (T7:T0), TA2 (T15:T8)
DS1961S Sets EN LFS = 0
Duration: tCSHA
Duration: tPROG



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