5.8.5 Bulk Transfer Data Sequences
Bulk transactions use data toggle bits that are toggled only upon successful transaction completion to
preserve synchronization between transmitter and receiver when transactions are retried due to errors. Bulk
transactions are initialized to DATA0 when the endpoint is configured by an appropriate control transfer.
The host will also start the first bulk transaction with DATA0. 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.
This recovery will reset the data toggle bit to DATA0 for the endpoint on both the host and the device.