ADP1055ACPZ-R7 datasheet(54/140 Pages) AD

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ADP1055

Data Sheet

Rev. A | Page 54 of 140

EEPROM

The ADP1055 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 (for internal use only), and the main

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

into 16 pages; each page contains 512 bytes.

OVERVIEW

The EEPROM controller provides an interface between the

ADP1055 core logic and the built-in Flash/EE. The user can

control data access to and from the EEPROM through this

controller interface. Different I2C commands are available for

the different operations to the EEPROM.

Communication is initiated by the master device sending a

command to the I2C slave device to access data from or send

data to the EEPROM. Using read and write commands, 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. Send commands are also supported; a send

command is executed by the slave device upon receiving the stop

bit. The stop bit is the last bit in a complete data transfer, as defined

in the I2C communication protocol. For a complete description

of the I2C protocol, see the Philips I2C Bus Specification, Version 2.1,

dated January 2000.

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. Page 2 and Page 3 are reserved for storing the black

box information, and Page 4 and Page 5 are used to store the GUI

settings and factory tracking information. The user cannot perform

a page erase operation to any of Page 0 to Page 5.

Only Page 6 to Page 15 of the main block can be used to store

data. To erase any page from Page 6 to Page 15, the EEPROM

must first be unlocked for access. For instructions on how to

unlock the EEPROM, see the Unlock the EEPROM section.

Page 6 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 82. Example Erase Command

In this example, command code = 0xD4 and data byte = 0x0A.

Wait at least 35 ms for the page erase operation to complete

before executing the next I2C 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 logic low previously.

READ OPERATION (BYTE READ AND BLOCK READ)

Read from Main Block, Page 0 to Page 5

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

default settings and user settings, respectively. Page 2 and

Page 3 are reserved for storing the black box information, and

Page 4 and Page 5 are used to store the GUI settings and factory

tracking information. These pages are intended to prevent third-

party access to this data. To read a page from Page 0 to Page 5,

the user must first unlock the EEPROM (see the Unlock the

EEPROM section). After the EEPROM is unlocked, Page 0 to

Page 5 are readable using the EEPROM_PAGE_xx commands,

as described in the Read from Main Block, Page 6 to Page 15

section. Note that when the EEPROM is locked, a read from

Page 0 to Page 5 returns invalid data.

Read from Main Block, Page 6 to Page 15

Data in Page 6 to Page 15 of the main block 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_PAGE_xx commands (Register 0xB0 to

Before executing this command, the user must program the

number of bytes to read using the EEPROM_NUM_RD_BYTES

command (Register 0xD2). The user can also 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 6 are read from

the EEPROM, starting from the fifth byte of that page.

Set the number of return bytes = 3.

Set address offset = 5.

7-BIT SLAVE

ADDRESS

DATA

BYTE

COMMAND

CODE

= MASTER-TO-SLAVE

= SLAVE-TO-MASTER

7-BIT SLAVE

ADDRESS

0xD2

0x03

= MASTER-TO-SLAVE

= SLAVE-TO-MASTER

7-BIT

SLAVE

ADDRESS

0xD3

0x00

0x05

= MASTER-TO-SLAVE

= SLAVE-TO-MASTER

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