X24F064 Datasheet, PDF (5/18 Pages) Xicor Inc. – SerialFlash TM Memory with Block Lock TM Protection

X24F064/032/016
DEVICE ADDRESSING
Following a start condition the master must output the
address of the slave it is accessing (see Figure 4). The
next two bits are the device select bits. A system could
have up to eight X24F032/016’s on the bus or up to
four 24F064’s on the bus. The device addresses are
defined by the state of the S₀, S₁, and S₂ inputs. Note
some of the slave addresses must be the inverse of
the corresponding input pin.
Figure 4. Slave Address
DEVICE
SELECT
X24F064
HIGH ORDER
SECTOR ADDRESS
S2
S1
A12 A11 A10 A9
A8 R/W
DEVICE
SELECT
X24F032
HIGH ORDER
SECTOR ADDRESS
S2
S1
S0 A11 A10 A9
A8 R/W
DEVICE
TYPE
IDENTIFIER
DEVICE
SELECT
X24F016
HIGH ORDER
SECTOR ADDRESS
1
S2
S1
S0 A10 A9
A8 R/W
6686 ILL F07.4
Figure 5. Sector Programming
Also included in the slave address is an extension of
the array’s address which is concatenated with the
eight bits of address in the sector address field,
providing direct access to the entire SerialFlash
Memory array.
The last bit of the slave address defines the operation
to be performed. When set HIGH a read operation is
selected, when set LOW a program operation is
selected.
Following the start condition, the X24F064/032/016
monitors the SDA bus comparing the slave address
being transmitted with its slave address device type
identifier. Upon a correct comparison of the device
select inputs, the X24F064/032/016 outputs an
acknowledge on the SDA line. Depending on the state
of the R/W bit, the X24F064/032/016 will execute a
read or program operation.
PROGRAMMING OPERATIONS
The X24F064/032/016 offers a 32-byte sector pro-
gramming operation. For a program operation, the
X24F064/032/016 requires a second address field.
This field contains the address of the first byte in the
sector. Upon receipt of the address, comprised of
eight bits, the X24F064/032/016 responds with an ac-
knowledge and awaits the next eight bits of data,
again responding with an acknowledge. The master
then transmits 31 more bytes. After the receipt of
each byte, the X24F064/032/016 will respond with an
acknowledge.
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
SLAVE
ADDRESS
T
S
BUS ACTIVITY:
X24F016/032/064
SECTOR ADDRESS
A
A
C
C
K
K
DATA n
DATA n+1
A
A
C
C
K
K
S
DATA n+31
T
O
P
P
A
C
K
6686 ILL F10.3
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