DS1961S-F5 Maxim Integrated Products, DS1961S-F5 Datasheet - Page 12

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

Figure 7-3. MEMORY AND SHA FUNCTIONS FLOW CHART (continued)
From Figure 7
To Figure 7
2nd Part
2nd Part
TA1 (T7:T0), TA2 (T15:T8)
Bus Master TX
and E/S Byte
Bus Master
Auth. Code
TX Reset ?
Load First
Match ?
RX “1”s
Secret ?
N
Master
5Ah
Y
N
N
Y
* 1-Wire Idle High for Power
EN_LFS Flag
N
Address
N
<7Fh ?
N
= 1 ?
Y
Y
12 of 36
Duration: t
Note: The 8-Byte Secret Must
First be Written to the
Scratchpad.
Address of
Secret ?
Y
PROG
DS1961S Copies Scratch-
Y
Y
Y
Pad Data to Address
DS1961S TX “0”
DS1961S TX “1”
Protected ?
TX Reset ?
TX Reset ?
AA = 1
Master
Master
Write-
From Figure 7
Y
N
To Figure 7
N
4th Part
4th Part
N
*