FT260Q-R datasheet(47/61 Pages) FTDI

47 / 61 page

FT260 HID-CLASS USB TO UART/I2C BRIDGE IC

Version 1.1

Document No.: FT_001272 Clearance No.: FTDI#484

9.2

Programming the external EEPROM over USB

The external EEPROM can be programmed over USB, which is supported by FT_PROG as most FTDI chips

do.

The FT_Prog utility is provided free-of-charge from the FTDI website, and can be found at the link below.

The user guide is also available at this link.

http://www.ftdichip.com/Support/Utilities.htm#FT_Prog

Please note that a user needs to specify the data address type as one-byte or two-byte when

programming the external EEPROM.

9.2.1 Supported EEPROM Spec

The FT260 supports an external EEPROM with I²C interface, slave address 0x50~0x57, and data size

larger than 256 bytes. When the FT260 powers on, it will scan the I²C bus and try to find if an external

EEPROM is present. If it is present, it will check the content and load the configuration data from the

EEPROM into the FT260. Note that loading data from an external EEPROM is the last step of power-on,

and it will overwrite the configuration data from eFUSE.

There are two different types of EEPROM. One has one-byte data address; the other one has two-byte

data address. Usually, the first one has a data size smaller than 256 bytes, and the second one has a

data size more than 256 bytes. It is not possible for the FT260 to automatically identify the EEPROM type,

therefore, FT_prog will require the user’s input to specify the type of the external EEPROM.

In summary, the supported external EEPROM has:



I²C interface with slave address 0x50~0x57



256 bytes at least



One-byte data address or two-byte data address

The protocol of one-byte data address EEPROM

Write:

7 bit slave

address

8 bit

data addr

8 bit data

Read:

7 bit slave

address

8 bit

data addr

7 bit slave

address

8 bit data

Figure 9.1 Protocol Format for EEPROM with One Byte Data Address

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