CYUSB302X datasheet(31/34 Pages) CYPRESS

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Document Number: 001-55190 Rev. *L

Page 31 of 34

CYUSB302x

2. USB enumeration failure in USB boot mode when FX3 is self-powered.

❐ Problem Definition

FX3 device may not enumerate in USB boot mode when it is self-powered. The bootloader is designed for bus power mode. It

does not make use of the VBUS pin on the USB connector to detect the USB connection and expect that USB bus is connected

to host if it is powered. If FX3 is not already connected to the USB host when it is powered, then it enters into low-power mode

and does not wake up when connected to USB host.

❐ Parameters Affected

N/A

❐ Trigger Conditions

This condition is triggered when FX3 is self-powered in USB boot mode.

❐ Scope Of Impact

Device does not enumerate

❐ Workaround

Reset the device after connecting to USB host.

❐ Fix Status

No fix. Workaround is required.

3. Bus collision is seen when the I2C block is used as a master in the I2C Multi-master configuration.

❐ Problem definition

When FX3 is used as a master in the I2C multi-master configuration, there can be occasional bus collisions.

❐ Parameters affected

❐ Trigger Conditions

This condition is triggered only when the FX3 I2C block operates in Multi-master configuration.

❐ Scope Of Impact

The FX3 I2C block can transmit data when the I2C bus is not idle leading to bus collision.

❐ Workaround

Use FX3 as a single master.

❐ Fix Status

No fix.

CYUSB302X 데이터시트(PDF) 31 Page - Cypress Semiconductor