Datasheet

DS1992/DS1993
8 of 17
Figure 6. MEMORY FUNCTIONS FLOW CHART (continued)
Y
N
Bus Master TX
TA1 (T7:T0)
Bus Master TX
TA2 (T15:T8)
Scratchpad
55H
Copy
?
N
Y
From Figure 6
First Part
Bus Master TX
E/S Byte
DS199x Copies
Scratchpad Data
To Memory
Authorization
Code Match
?
DS199x TX "1"s
DS199x TX "0"s
AA = 1
F0H
Read Memory
?
N
To Figure 6
First Part
Y
N
Bus Master
TX Reset
?
Bus Master
TX Reset
?
Y
N
Y
Y
Bus Master TX
TA1 (T7:T0)
Bus Master TX
TA2 (T15:T8)
DS199x sets Memory
Address = (T15:T0)
N
Y
N
Master RX Data
Byte From
Memory Address
Bus Master
TX Reset
?
Memory
DS199x
Address Counter
Increments
Bus Master
RX "1"s
Address
= 21Dh ?