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DS1961S-F3+
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
P25-P27
P28-P30
P31-P33
P34-P36
DS1961S
10 of 36
Figure 7-1. MEMO
RY A
N
D SHA FUNCTIONS FLOW CHART
0Fh
Write S
cratch-
pad ?
Master
TX Reset ?
Master TX
Data Byte
To Scr
atch
p
ad
Bus Mast
er TX
TA1
(
T7:T0
),
TA2
(
T15:T8
)
Y
N
N
Y
N
Address
< 90h ?
Y
Bus Ma
ster
RX “1”s
Master
TX Reset ?
Y
N
DS1961S S
ets Scratc
hpad
Byte Counter =
0,
Clears PF
, AA,
Sets T2:T
0 = 0, 0, 0,
Sets E
2:E0 = 1, 1, 1
Byte Counter
= 7 ?
DS1961S TX CRC1
6
of Command, Ad
dress,
Data Bytes as
They
Were S
ent by the Bus
DS1961S
Increments
B
y
te Counter
Master
TX Reset ?
Y
N
Bus Mast
er
RX “1”s
Partial
Byte ?
PF = 1
Y
N
N
Y
To Figure
7
2nd Part
From Figure 7
2nd Part
Bus Mast
er TX Memory
Function Co
mmand
To ROM Fu
nctions
Flow Chart
(
Fi
g
ure 9
)
From ROM Fu
nctions
Flow Chart
(
Fi
g
ure 9
)
DS1961S S
ets EN
_
LFS = 0
Note
:
See the Write
Scr
atchpad
Description for
A
dditional
Information.
DS1961S
11 of 36
Figure 7-2. MEMORY
A
ND SH
A
FU
NCTIONS FLOW CHART (continued)
AAh
Read Scratc
h-
Pad ?
DS1961S S
ets Scr
atchpad
B
y
te Counter =
0
Bus Mast
er RX
TA1 (T
7:T0), TA2 (
T15:T8)
and E/S B
y
te
Bus Mast
er RX
Data B
y
te from S
cratch
p
ad
Bus Master RX CRC16
of Command, A
ddress
,
E/S B
yte, Data Bytes
as
Sent b
y
the DS19
61S
Y
Bus Mast
er
RX “1”s
Master
TX Reset ?
Y
N
Master
TX Reset ?
DS1961S
Increments
B
y
te Counter
Byte Count
er
= 7 ?
Y
Y
N
N
N
From Figur
e 7
1st Part
To Figure 7
1st
Part
To Figure 7
3rd
Part
From Figur
e 7
3rd
Part
Note
:
See the Rea
d
Scratc
hpad
Descri
ption for
A
dditiona
l
Informati
on.
DS1961S
12 of 36
Figure 7-3. MEMORY
A
ND SH
A
FU
NCTIONS FLOW CHART (continued)
* 1-Wi
re Idle H
igh for P
ower
From F
igure 7
2nd Part
To Fi
gure 7
2nd Part
To Figure 7
4th Part
From Figur
e 7
4th Part
5Ah
Load Fi
rst
Secret ?
Bus Mast
er TX
TA1 (T7:T0), TA2 (T15
:T8)
and E/S B
y
te
Y
N
Bus Ma
ster
RX “1”s
Master
TX Reset ?
Y
N
Note
: The
8-Byte S
ecr
et Must
Firs
t be Wri
tten to the
Scratch
p
ad.
Y
Auth. Cod
e
Match ?
N
Addres
s of
Secret ?
Y
N
N
Write-
Protecte
d ?
Y
DS1961S
Copie
s Scr
atch-
Pad Data to A
ddr
ess
A
A = 1
*
DS1961S T
X “0”
Master
TX Rese
t ?
Master
TX Rese
t ?
Y
N
DS1961S T
X “1”
N
Y
Addre
ss
<7Fh ?
N
Y
EN_LFS
Flag
= 1 ?
N
Y
Duration: t
PR
OG
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
P25-P27
P28-P30
P31-P33
P34-P36
DS1961S-F3+
Mfr. #:
Buy DS1961S-F3+
Manufacturer:
Maxim Integrated
Description:
iButtons & Accessories 1kb Protected EEPROM iButton w/SHA-1 Eng
Lifecycle:
New from this manufacturer.
Delivery:
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EMS
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DS1961S-F3+