USB 控制传输是否保证交付？
Do USB Control Transfers guarantee delivery?
USB 2.0 specifies 4 种传输类型（在第 5.4 节传输类型中）：
- 控制转移
- 同步传输
- 中断传输
- 批量转账
第 5.8 节说批量转账提供：
- Access to the USB on a bandwidth-available basis
- Retry of transfers, in the case of occasional delivery failure due to errors on the bus
- Guaranteed delivery of data but no guarantee of bandwidth or latency
（强调我的。）
我没有看到类似的控制转移声明。他们也保证交货吗？如果不是，用户应该如何处理故障？
请提供引用以支持您的回答。
USB 规范为控制传输提供了可靠的错误检测和恢复。控制传输要么完成，要么 USB 主机知道它失败了，我认为这就是 "guaranteed delivery" 的意思。这很重要，因为当您将设备插入计算机时，控制传输用于设置设备，并且它们还被各种 USB 设备用于许多重要目的 类（例如，它们用于设置波特率USB CDC ACM 设备上的串行端口）。
来自 USB 2.0 规范的第 5.5.5 节：
The USB provides robust error detection and recovery/retransmission for errors that occur during control transfers. Transmitters and receivers can remain synchronized with regard to where they are in a control transfer and recover with minimum effort. Retransmission of Data and Status packets can be detected by a receiver via data retry indicators in the packet. A transmitter can reliably determine that its corresponding receiver has successfully accepted a transmitted packet by information returned in a handshake to the packet. The protocol allows for distinguishing a retransmitted packet from its original packet except for a control Setup packet. Setup packets may be retransmitted due to a transmission error; however, Setup packets cannot indicate that a packet is an original or a retried transmission.
唯一不保证交付的传输类型是等时传输。此外，帧开始 (SOF) 数据包无法保证交付。
USB 2.0 specifies 4 种传输类型（在第 5.4 节传输类型中）：
- 控制转移
- 同步传输
- 中断传输
- 批量转账
第 5.8 节说批量转账提供：
- Access to the USB on a bandwidth-available basis
- Retry of transfers, in the case of occasional delivery failure due to errors on the bus
- Guaranteed delivery of data but no guarantee of bandwidth or latency
（强调我的。）
我没有看到类似的控制转移声明。他们也保证交货吗？如果不是，用户应该如何处理故障？
请提供引用以支持您的回答。
USB 规范为控制传输提供了可靠的错误检测和恢复。控制传输要么完成，要么 USB 主机知道它失败了，我认为这就是 "guaranteed delivery" 的意思。这很重要，因为当您将设备插入计算机时，控制传输用于设置设备，并且它们还被各种 USB 设备用于许多重要目的 类（例如，它们用于设置波特率USB CDC ACM 设备上的串行端口）。
来自 USB 2.0 规范的第 5.5.5 节：
The USB provides robust error detection and recovery/retransmission for errors that occur during control transfers. Transmitters and receivers can remain synchronized with regard to where they are in a control transfer and recover with minimum effort. Retransmission of Data and Status packets can be detected by a receiver via data retry indicators in the packet. A transmitter can reliably determine that its corresponding receiver has successfully accepted a transmitted packet by information returned in a handshake to the packet. The protocol allows for distinguishing a retransmitted packet from its original packet except for a control Setup packet. Setup packets may be retransmitted due to a transmission error; however, Setup packets cannot indicate that a packet is an original or a retried transmission.
唯一不保证交付的传输类型是等时传输。此外，帧开始 (SOF) 数据包无法保证交付。