最終更新:2015-02-25 (水) 15:31:12 (1671d)  

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  • If a non-isochronous pipe encounters a condition that causes it to send a STALL to the host (refer to Chapter 8) or three bus errors are encountered on any packet of an IRP, the IRP is aborted/retired, all outstanding IRPs are also retired, and no further IRPs are accepted until the software client recovers from the condition (in an implementation-dependent way) and acknowledges the halt or error condition via a USBD call. An appropriate status informs the software client of the specific IRP result for error versus halt (refer to Chapter 10). Isochronous pipe behavior is described in Section 5.6.

転送別

バルク転送

  • If a halt condition is detected on a bulk pipe due to transmission errors or a STALL handshake being returned from the endpoint, all pending IRPs are retired. Removal of the halt condition is achieved via software intervention through a separate control pipe.

USB/ハンドシェイクパケット

STALL

  • Endpoint is halted or a control pipe request is not supported.

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