Overview Of Usb Function - Fujitsu F2MC-16LX Hardware Manual

CHAPTER 13 USB FUNCTION
13.1

Overview of USB Function

The USB Function is an interface that supports the USB (Universal Serial Bus)
communication protocol. It operates supporting the transfer speed of FULL (12 Mbps)
and has the following characteristics.
Features of USB Function
• FULL speed (12 Mbps) is supported. (conform to USB2.0 Full Speed)
• The device status is auto-answer.
• Bit string, bit stuffing, and automatic generation and check of CRC5 and CRC16
• Toggle check by data synchronization bit
• Automatic response to all standard commands except Get/SetDescriptor and SynchFrame commands
(these three commands can be processed the same way as the class vendor commands).
• The class vendor commands can be received as data and responded via firmware.
• Supports up to six EndPoints (EndPoint0 is fixed to control transfer)
• 2 built-in transfer data buffers for each EndPoint (each of two built-in buffers dedicated to IN and OUT,
respectively, for EndPoint0)
• Supports automatic transfer mode for transfer data via DMA (except buffers for EndPoint0)
• Function for detecting a connection and disconnection to the USB bus by monitoring the power line.
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