Rainbow Electronics DS2432 - Manual (Page 10)

PRELIMINARY DS2432
10 of 30
Memory and SHA Functions Flow Chart (continued) Figure 7
*
1-Wire idle high for power
From Figure 7
2
nd
Part
To Figure 7
2
nd
Part
To Figure 7
4
th
Part
From Figure 7
4
th
Part
5Ah
Load First
Secret ?
Bus Master TX
TA1 (T7:T0), TA2 (T15:T8)
and E/S Byte
Y
N
Bus Master
RX “1”s
Master
TX Reset ?
Y
N
Note: The 8-byte secret
must first be written to
the scratchpad.
Y
Auth. Code
Match ?
N
Address of
Secret ?
Y N
N
Write-
Protected ?
Y
DS2432 copies Scratch-
pad Data to Secret
AA = 1
*
DS2432 TX “0”
Master
TX Reset ?
Master
TX Reset ?
Y
N
DS2432 TX “1”
N
Y