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UPSD3422EB40U6 Datasheet(PDF) 154 Page - STMicroelectronics |
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UPSD3422EB40U6 Datasheet(HTML) 154 Page - STMicroelectronics |
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154 / 300 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) USB interface UPSD3422, UPSD3433, UPSD3434, UPSD3454 154/300 25.2 Types of transfers The USB specification defines four types of transfers, Bulk, Interrupt, Isochronous, and Control. Note: The UPSD34xx supports all types of transfers except Isochronous. ● Bulk Transfers (see Figure 50) Bulk data is transferred in both directions and is used with both IN and OUT endpoints. Packets may be 8, 16, 32, or 64 bytes in length. Bulk transfers occur in bursts, and are scheduled by the host when there is available time on the bus. While there is no guaranteed delivery time for bulk transfers, the accuracy of the data is guaranteed due to automatic retries for erroneous data. Bulk transfers are typically used for mass storage, printer, and scanner data. ● Interrupt Transfers (see Figure 51) Interrupt data is a lot like bulk data but travels only in one direction, from the device to the host, so only IN endpoints are used. Interrupt data holds packet sizes ranging from 1 to 64 bytes. Interrupt endpoints have an associated polling interval, meaning that the host sends IN tokens at a periodic interval to the host on a regular basis. Interrupt transfers are typically used for human interface devices such as keyboards, mice, and joysticks. Figure 50. IN and OUT bulk transfers Token packet Data packet Handshake packet IN ADDR ENDP CRC5 CRC16 ACK Data1 Payload data Token packet Data packet Handshake packet OUT ADDR ENDP CRC5 CRC16 ACK Data1 Payload data AI10490b Obsolete Product(s) - Obsolete Product(s) |
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