AT88SC1608-09PT-00 ATMEL Corporation, AT88SC1608-09PT-00 Datasheet - Page 10

• Manufacturer Part Number: AT88SC1608-09PT-00
• Description: 8 x 256 x 8 Secure Memory with Authentication
• Manufacturer: ATMEL Corporation

Read Zone
Write Zone
Read Fuses
10
AT88SC1608
Figure 5. Read Zone
Note:
The data byte address is internally incremented following the transmission of each data
byte. As long as the AT88SC1608 receives an acknowledge from the host, it will con-
tinue to increment the data byte address and serially clock out sequential data bytes.
During a read operation, the address will “roll over” from the last byte of the current zone
to the first byte of the same zone. If the host is not allowed to read at the specified
address, the device will transmit the data byte with all bits equal to “0”.
Figure 6. Write Zone
Note:
The lower four bits of the data byte address are internally incremented following the
receipt of each data byte. The higher data byte address bits are not incremented, retain-
ing the 16-byte write-page address. Each data byte within a page must only be loaded
once. Once a stop condition is issued to indicate the end of the host’s write command,
the device initiates the internally timed nonvolatile write cycle. An ACK polling sequence
can be initiated immediately. After a write command, if the host is not allowed to write to
some address locations, a nonvolatile write cycle will still be initiated. However, the
device will only modify data at the allowed addresses.
Figure 7. Read Fuses
Note:
S
T
A
R
T
S
T
A
R
T
1 0 1 1 0 z 0 0
S
T
A
R
T
Command
Command
z = 0: Read user zone
z = 1: Read configuration zone
z = 0: Write user zone
z = 1: Write configuration zone
F
F
x
x
1 0 1 1 0 1 0 1
= 1: fuse is not blown
= 0: fuse is blown
0
Command
A
C
K
A
C
K
A
A
7
7
Byte Add (n)
Byte Add (n)
A
C
K
–
–
1 0 0 0 0 0 0 0
Fuses Add
A
A
0
0
A
C
K
A
C
K
D
D
7
7
Data (n)
Data (n)
–
–
A
C
K
D
0 0 0 0 0 F
D
0
0
A
C
K
A
C
K
D
D
2
F
7
7
Data (n+x)
Data (n+x)
1
F
0
0971G–SMEM–04/04
–
–
N
A
C
K
S
T
O
P
D
D
0
0
N
A
C
K
A
C
K
S
T
O
P
S
T
O
P