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CYUSB302X датащи(PDF) 31 Page - Cypress Semiconductor

номер детали CYUSB302X
подробное описание детали  SD3??USB and Mass Storage Peripheral Controller
PDF  34 Pages
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производитель  CYPRESS [Cypress Semiconductor]
домашняя страница  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CYUSB302X датащи(HTML) 31 Page - Cypress Semiconductor

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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
NA
❐ 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.



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