DS1961S-F5 Maxim Integrated Products, DS1961S-F5 Datasheet - Page 10

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

Figure 7-1. MEMORY AND SHA FUNCTIONS FLOW CHART
Bus Master
TX Reset ?
RX “1”s
Master
Y
DS1961S Sets EN_LFS = 0
N
N
TA1 (T7:T0), TA2 (T15:T8)
Bus Master TX Memory
Function Command
Bus Master TX
Write Scratch-
Address
< 90h ?
pad ?
0Fh
Bus Master
Byte Counter
RX “1”s
Increments
Y
DS1961S
Flow Chart (Figure 9)
To ROM Functions
N
Y
10 of 36
DS1961S Sets Scratchpad
N
N
of Command, Address,
Were Sent by the Bus
DS1961S TX CRC16
Master TX Data Byte
Sets T2:T0 = 0, 0, 0,
Sets E2:E0 = 1, 1, 1
Data Bytes as They
Byte Counter = 0,
Clears PF, AA,
From ROM Functions
To Scratchpad
Flow Chart (Figure 9)
Byte Counter
TX Reset ?
TX Reset ?
Master
Master
= 7 ?
N
Y
Y
Y
Partial
Byte ?
PF = 1
From Figure 7
To Figure 7
Y
2nd Part
2nd Part
Note:
See the Write
Scratchpad
Description for
Additional
Information.
N