ADP1048WARQZ-R7 datasheet(38/82 Pages) AD

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ADP1048W

Data Sheet

EEPROM

The ADP1048W has a built-in EEPROM controller that is used

to communicate with the embedded 8K × 8-byte EEPROM. The

EEPROM, also called Flash®EE, is partitioned into two major

blocks: the INFO block and the main block.

The INFO block contains 128 8-bit bytes, and the main block

contains 8K 8-bit bytes. The main block is further partitioned

into 16 pages, each page containing 512 bytes.

OVERVIEW

The EEPROM controller provides an interface between the

ADP1048W core logic and the built-in Flash/EE. The user can

control data access to and from the EEPROM through this

controller interface. Separate PMBus commands are available

for the read, write, and erase operations to the EEPROM.

Communication is initiated by the master device sending a

command to the PMBus slave device to access data from or

send data to the EEPROM. Read, write, and erase commands

are supported. Data is transferred between devices in a byte

wide format. Using a read command, data is received from the

EEPROM and transmitted to the master device. Using a write

command, data is received from the master device and stored

in the EEPROM through the EEPROM controller.

PAGE ERASE OPERATION

The main block consists of 16 equivalent pages of 512 bytes

each, numbered Page 0 to Page 15. Page 0 and Page 1 of the

main block are reserved for storing the default settings and user

settings, respectively. The user cannot perform a page erase

operation to Page 0 or Page 1.

Main Block Page Erase (Page 2 to Page 15)

To erase any page from Page 2 to Page 15 of the main block, the

EEPROM must first be unlocked for access. For instructions on

how to unlock the EEPROM, see the Unlock EEPROM section.

Page 2 to Page 15 of the main block can be individually erased

using the EEPROM_PAGE_ERASE command (Register 0xD4).

For example, to perform a page erase of Page 10, execute the

following command:

Figure 40. Example Erase Command

In this example, Command Code = 0xD4 and Data Byte =

0x0A.

Note that it is important to wait at least 35 ms for the page

erase operation to complete before executing the next PMBus

command.

The EEPROM allows erasing of whole pages only; therefore, to

change the data of any single byte in a page, the entire page

must first be erased (set high) for that byte to be writable.

Subsequent writes to any bytes in that page are allowed as long

as that byte has not been written to a low previously.

READ OPERATION (BYTE READ AND BLOCK READ)

Read from Page 0 and Page 1

Page 0 and Page 1 of the main block are reserved for storing the

default settings and user settings, respectively, and are meant to

prevent third-party access to this data. To read from Page 0 or

Page 1, the user must first unlock the EEPROM (see the Unlock

EEPROM section). After they are unlocked, Page 0 and Page 1

are readable using the EEPROM_DATA_xx commands, as

described in the Read from Page 2 to Page 15 section. Note that

when the EEPROM is locked, a read from Page 0 and Page 1

returns invalid data.

Read from Page 2 to Page 15

Data in Page 2 to Page 15 is always readable, even with the

EEPROM locked. The data in the EEPROM main block can

be read one byte at a time or in multiple bytes in series using

the EEPROM_DATA_xx commands (Command Code 0xB0

to Command Code 0xBF).

Before executing this command, the user must program the

number of bytes to read using the EEPROM_NUM_RD_BYTES

command (Register 0xD2). Also, the user can program the offset

from the page boundary where the first read byte is returned

using the EEPROM_ADDR_OFFSET command (Register 0xD3).

In the following example, three bytes from Page 4 are read from

EEPROM, starting from the fifth byte of that page.

1. Set number of return bytes = 3.

2. Set address offset = 5.

3. Read three bytes from Page 4.

Note that the block read command can read a maximum of 256

bytes for any single transaction.

DATA BYTE

SLAVE

ADDRESS

COMMAND

CODE

MASTER TO SLAVE

SLAVE TO MASTER

0x03

0xD2

SLAVE

ADDRESS

MASTER TO SLAVE

SLAVE TO MASTER

0x00

0x05

0xD3

SLAVE

ADDRESS

MASTER TO SLAVE

SLAVE TO MASTER

0xB4

SLAVE

ADDRESS

SLAVE

ADDRESS

...

BYTE COUNT =

0x03

DATA BYTE

MASTER TO SLAVE

SLAVE TO MASTER

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