SE97BTP datasheet(16/53 Pages) NXP

16 / 53 page

SE97B_1

Product data sheet

Rev. 01 — 27 January 2010

16 of 53

NXP Semiconductors

SE97B

DDR memory module temp sensor with integrated SPD

7.10.1 Write operations

7.10.1.1

Byte Write

In Byte Write mode the master creates a START condition and then broadcasts the slave

address, byte address, and data to be written. The slave acknowledges all 3 bytes by

pulling down the SDA line during the ninth clock cycle following each byte. The master

creates a STOP condition after the last ACK from the slave, which then starts the internal

write operation (see Figure 11). During internal write, the slave will ignore any read/write

request from the master.

7.10.1.2

Page Write

The SE97B contains 256 bytes of data, arranged in 16 pages of 16 bytes each. The page

is selected by the four Most Significant Bits (MSB) of the address byte presented to the

device after the slave address, while the four Least Significant Bits (LSB) point to the byte

within the page. By loading more than one data byte into the device, up to an entire page

can be written in one write cycle (see Figure 12). The internal byte address counter will

increment automatically after each data byte. If the master transmits more than

16 data bytes, then earlier bytes will be overwritten by later bytes in a wrap-around

fashion within the selected page. The internal write cycle is started following the STOP

condition created by the master.

Fig 11. Byte Write timing

002aab246

A2 A1 A0

slave address (memory)

START condition

R/W acknowledge

from slave

acknowledge

from slave

word address

SDA

STOP condition;

write to the memory is performed

data

DATA

acknowledge

from slave

Fig 12. Page Write timing

A2 A1 A0

slave address (memory)

START condition

R/W acknowledge

from slave

acknowledge

from slave

word address

SDA

data to memory

DATA n

acknowledge

from slave

002aab247

STOP condition;

write to the memory is performed

data to memory

DATA n

+ 15

acknowledge

from slave

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