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I2C Bootloader

Document Number: 001-13258 Rev. *J Page 13 of 39

at colder temperatures. Bootloading at significantly lower temperatures than the parameter setting

may result in reduced memory retention. For this reason, you must take precautions to ensure that

the bootloader is never operated more than 20°C from the value in this parameter. See the Cypress

device specification for more information.

Ignore_N_I2C_Prefix_Bytes

Note The RS-232 to I

C translator project sends 2 prefix bytes to the device. As a result, the correct set-

ting for this parameter when using the given demonstration applications is 2. This is also used for

certain SM-bus protocols based on I

C. This parameter enables you to configure the Bootloader to

ignore a variable number of prefix bytes.

BootLdrI2C_ver

This is the version of the bootloader. It is currently not used by the internal firmware, but is available

as part of the Checksum block. You can set it up and use it to verify the correct version of bootloader

executable code.

C Topology Selection Options

When placing a BootLdrI2C User Module, you must decide which I

C topology to implement for the

bootloader project.

C Operation for Bootloader only: This option gives I

C communication for the bootloader only. No

user module API support is included for I

C slave communications. Select this option if your applica-

tion uses I

C communication for bootloading only.

Full I

C API Support with Bootloader: This option gives code to support the application use of I

C in

addition to Bootloader through I

C. Select this option if you plan to use I

C communication in your

application for other purposes besides bootloading.

Figure 4. I2C Topology Options

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Cypress Semiconductor Perform CY20x34 Fiche technique Page 13