X24321 datasheet(6/13 Pages) XICOR

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X24321

Figure 5. Page Write Sequence

WRITE OPERATIONS

Byte Write

For a Byte Write Operation, the device requires the

Slave Address Byte, the Word Address Byte 1, and the

Word Address Byte 0, which gives the master access to

any one of the bytes in the array. Upon receipt of the

Word Address Byte 0, the device responds with an

acknowledge, and waits for the ﬁrst eight bits of data.

After receiving the 8 bits of the data byte, the device

again responds with an acknowledge. The master then

terminates the transfer by generating a stop condition,

at which time the device begins the internal write cycle

to the nonvolatile memory. While the internal write cycle

is in progress the device inputs are disabled and the

device will not respond to any requests from the master.

The SDA pin is at high impedance. See ﬁgure 4.

Page Write Operation

The device executes a thirty-two byte Page Write

Operation. For a Page Write Operation, the device

requires the Slave Address Byte, Address Byte 1, and

Address Byte 0. Address Byte 0 must contain the ﬁrst

byte of the page to be written. Upon receipt of Address

Byte 0, the device responds with an acknowledge, and

waits for the ﬁrst eight bits of data. After receiving the 8

bits of the ﬁrst data byte, the device again responds

with an acknowledge. The device will respond with an

acknowledge after the receipt of each of 31 more

bytes. Each time the byte address is internally incre-

mented by one, while page address remains constant.

When the counter reaches the end of the page, the

master terminates the data loading by issuing a stop

condition, which causes the device to begin the

nonvolatile write cycle. All inputs are disabled until

completion of the nonvolatile write cycle. The SDA pin

is at high impedance. Refer to ﬁgure 5 for the address,

acknowledge, and data transfer sequence.

SLAVE

ADDRESS

7012 ILL F08.1

DATA

(1)

SIGNALS

FROM THE

MASTER

SDA BUS

SIGNALS

FROM THE

SLAVE

DATA

(32)

ADDRESS

BYTE 1

ADDRESS

BYTE 0

1 0 1 0

SIGNALS

FROM THE

MASTER

SDA BUS

SIGNALS

FROM THE

SLAVE

ADDRESS

WORD ADDRESS

BYTE 1

DATA

1 0 1 0

WORD ADDRESS

BYTE 0

7040 FM 07

SIGNALS

FROM THE

MASTER

SDA BUS

SIGNALS

FROM THE

SLAVE

ADDRESS

WORD ADDRESS

BYTE 1

DATA

1 0 1 0

WORD ADDRESS

BYTE 0

7040 FM 07

Figure 4. Byte Write Sequence

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