DS1961S-F5 Maxim Integrated Products, DS1961S-F5 Datasheet - Page 14

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

Figure 7-5. MEMORY AND SHA FUNCTIONS FLOW CHART (continued)
From Figure 7
To Figure 7
4th Part
4th Part
N
N
Bus Master TX
TA2 (T15:T8),
Copy Scratch-
TA1 (T7:T0),
Protected ?
Bus Master
Auth. Code
TX Reset ?
E/S Byte
Match ?
RX “1”s
Master
Write-
pad ?
55h
Y
Y
Y
Y
* 1-Wire Idle High for Power
N
N
Code of Secret, 28 Bytes of
N
DS1961S Copies Scratch-
14 of 36
Bus Master Computes MAC
Message Authentication
SHA Engine Computes
Page Data, Scratchpad
and Sends it to DS1961S
pad Data to Memory
Note: This Command is
Applicable to all R/W
Memory Addresses.
Data, and Device
Identity Register
DS1961S TX “0”
DS1961S TX “1”
Waits 10ms
TX Reset ?
TX Reset ?
Bus Master
MAC Code
Match ?
AA = 1
Master
Master
Y
N
Y
Duration: t
Y
N
Duration: t
*
*
PROG
TX Reset ?
DS1961S
TX “0”s
Master
CSHA
From Figure 7
To Figure 7
Y
6th Part
6th Part
N