DS1961S-F5 Maxim Integrated Products, DS1961S-F5 Datasheet - Page 13

• Manufacturer Part Number: DS1961S-F5
• Description: DS1961S 1kb Protected EePROM Ibutton With SHA-1 Engine
• Manufacturer: Maxim Integrated Products

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