Datasheet

DS2431-A1
1024-Bit, 1-Wire EEPROM
for Automotive Applications
_______________________________________________________________________________________ 9
BUS MASTER Tx MEMORY
FUNCTION COMMAND
BUS MASTER Tx
TA1 (T7:T0), TA2 (T15:T8)
BUS MASTER Rx
TA1 (T7:T0), TA2 (T15:T8),
AND E/S BYTE
BUS MASTER Rx
DATA BYTE FROM
SCRATCHPAD
MASTER Tx DATA BYTE
TO SCRATCHPAD
APPLIES ONLY
IF THE MEMORY
AREA IS NOT
PROTECTED.
IF WRITE PROTECTED,
THE DS2431-A1
COPIES THE DATE
BYTE FROM THE
TARGET ADDRESS
INTO THE SP.
IF IN EPROM MODE,
THE DS2431-A1
LOADS THE BITWISE
LOGICAL AND,
THE TRANSMITTED
BYTE, AND THE
DATA BYTE FROM
THE TARGETED
ADDRESS INTO
THE SP.
BUS MASTER
Rx "1"s
DS2431-A1
INCREMENTS
E2:E0
PF = 0
DS2431-A1 SETS
SETS PF = 1
CLEARS AA = 0
SETS E2:E0 = T2:T0
0Fh
WRITE SCRATCHPAD?
N
Y
N
Y
N
Y
Y
Y
N
N
MASTER Tx RESET?
E2:E0 = 7?
T2:T0 = 0?
MASTER Tx RESET?
DS2431-A1 SETS
SCRATCHPAD
BYTE COUNTER = T2:T0
AAh
READ SCRATCHPAD?
N
Y
DS2431-A1 Tx CRC-16 OF
COMMAND, ADDRESS,
DATA BYTES AS THEY
WERE SENT BY THE BUS
MASTER
BUS MASTER
Rx "1"s
Y
N
MASTER Tx RESET?
BUS MASTER Rx CRC-16
OF COMMAND, ADDRESS,
E/S BYTE, DATA BYTES
AS SENT BY THE DS2431-A1
Y
N
MASTER Tx RESET?
Y
BYTE COUNTER
= E2:E0?
FROM ROM FUNCTIONS
FLOW CHART (FIGURE 9)
TO ROM FUNCTIONS
FLOW CHART (FIGURE 9)
DS2431-A1
INCREMENTS
BYTE COUNTER
N
TO FIGURE 7
2ND PART
TO FIGURE 7
2ND PART
Figure 7. Memory Function Flow Chart