
DS2423
MEMORY FUNCTION FLOW CHART Figure 7 cont’d
From Figure 7
1 st Part
55H
Copy
Scratchpad
N
F0H
Read
Memory
To Figure 7
3 rd Part
N
Y
Y
Master TX
TA1 (T7:T0)
Master TX
TA2 (T15:T8)
Master TX
E/S Byte
Authorization
Code Match?
1)
1)
1)
N
Master TX
TA1 (T7:T0)
Master TX
TA1 (T7:T0)
DS2423 sets Memory
Address = (T15:T0)
Master RX Data Byte
from Memory Address
1)
1)
1)
Y
AA = 1
DS2423 Copies Scratchpad
Data to Memory
DS2423 Incre-
ments Address
Counter
Y
Master
TX Reset?
N
2)
Master
RX "1"s
1)
Master
RX "1"s
1)
N
End of
Memory?
N
Copying
Finished
Y
Master
TX Reset?
N
Y
Master RX "0"s
1)
DS2423 TX "0"
1)
Y
Master
TX Reset?
N
2)
Y
1)
DS2423 TX "1"
N
Master
TX Reset?
Y
2)
3 Part
To Figure 7
1 st Part
1) To be transmitted or received at Overdrive speed if OD = 1.
2) Reset Pulse to be transmitted at Overdrive speed if OD = 1.
Reset Pulse to be transmitted at normal speed if OD = 0 or if
the DS2423 is to be reset from Overdrive speed to regular
speed.
10 of 25
From Figure 7
rd